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Business Combinations and Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details)

v3.22.0.1
Business Combinations and Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 4 Months Ended 12 Months Ended
Dec. 01, 2021
Oct. 20, 2021
Dec. 18, 2020
Sep. 01, 2020
Feb. 28, 2021
Dec. 31, 2021
Oct. 19, 2021
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Business Combination, Separately Recognized Transactions [Line Items]                      
Goodwill           $ 1,662.6 $ 677.4 $ 1,662.6 $ 681.5 $ 522.6 $ 511.6
GAAP purchase consideration, net of cash acquired           $ 58.6 $ 0.9   $ 290.1 $ 55.7 $ 9.1
Payments to acquire businesses gross   $ 1,300.0                  
Customer relationships | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   6 years 10 years         6 years 6 years 6 years  
Customer relationships | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   13 years 11 years         13 years 17 years 15 years  
Developed technology | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   5 years 7 years         5 years 3 years 3 years  
Developed technology | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   16 years 10 years         16 years 16 years 16 years  
Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   10 years 7 years                
Trade names | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years               3 years 5 years 5 years  
Trade names | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years               10 years 9 years 9 years  
Distributor relationships | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   7 years           7 years      
Distributor relationships | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   13 years           13 years      
Backlog and other | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   1 year           1 year 1 year 1 year  
Backlog and other | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   4 years           4 years 9 years 9 years  
Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years   1 year                  
Noncompete Agreements | Minimum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years     2 years                
Noncompete Agreements | Maximum                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Original Average Life in Years     3 years                
Mirion TopCo                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Date of acquisition   Oct. 20, 2021                  
Segment   Total                  
Goodwill   $ 1,639.0                  
Amortizable intangible assets   821.0                  
Cash   101.9                  
Accounts receivable   114.3                  
Cost in excess of billings   63.6                  
Inventory   144.6                  
Property, Plant and Equipment   126.4                  
Other current and non-current assets   24.3                  
Right of use assets   43.3                  
Other non-current assets   17.0                  
Current liabilities   (148.3)                  
Current lease liability   (8.8)                  
Deferred contract revenue   (58.9)                  
Notes payable assumed   (2.9)                  
Other long-term liabilities   (242.1)                  
Minority interest   (2.1)                  
Net tangible assets acquired   172.3                  
Purchase consideration   2,632.3                  
Less: cash acquired   (101.9)                  
GAAP purchase consideration, net of cash acquired   2,530.4                  
Mirion TopCo | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   338.8                  
Mirion TopCo | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   234.6                  
Mirion TopCo | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   100.5                  
Mirion TopCo | Distributor relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   61.1                  
Mirion TopCo | Backlog and other                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   81.5                  
Mirion TopCo | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   $ 4.5                  
Medical | Mirion TopCo                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Segment   Medical                  
Goodwill   $ 675.2                  
Amortizable intangible assets   330.5                  
Cash   7.8                  
Accounts receivable   44.0                  
Cost in excess of billings   0.0                  
Inventory   25.1                  
Property, Plant and Equipment   52.6                  
Other current and non-current assets   5.8                  
Right of use assets   22.3                  
Other non-current assets   8.0                  
Current liabilities   (31.9)                  
Current lease liability   (4.1)                  
Deferred contract revenue   (34.7)                  
Notes payable assumed   (1.8)                  
Other long-term liabilities   (70.6)                  
Minority interest   0.0                  
Net tangible assets acquired   22.5                  
Medical | Mirion TopCo | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   152.7                  
Medical | Mirion TopCo | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   66.3                  
Medical | Mirion TopCo | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   36.8                  
Medical | Mirion TopCo | Distributor relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   52.5                  
Medical | Mirion TopCo | Backlog and other                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   17.7                  
Medical | Mirion TopCo | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   $ 4.5                  
Medical | CIRS                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Date of acquisition Dec. 01, 2021                    
Segment Medical                    
Goodwill $ 35.0                    
Amortizable intangible assets 21.8                    
Cash 1.0                    
Accounts receivable 1.6                    
Inventory 2.0                    
Property, Plant and Equipment 0.4                    
Operating ROU assets 3.8                    
Current liabilities (0.5)                    
Other long-term liabilities (10.0)                    
Net tangible assets acquired (1.7)                    
Purchase consideration 55.1                    
Less: cash acquired (1.0)                    
GAAP purchase consideration, net of cash acquired 54.1                    
Acquiree revenue post acquisition through the period ended 1.5                    
Acquiree income (loss) from operations post acquisition through the period ended (0.1)                    
Medical | CIRS | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets $ 1.6                    
Original Average Life in Years 7 years                    
Medical | CIRS | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets $ 19.2                    
Original Average Life in Years 5 years                    
Medical | CIRS | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets $ 0.4                    
Original Average Life in Years 3 years                    
Medical | CIRS | Backlog and other                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets $ 0.6                    
Original Average Life in Years 2 years                    
Medical | Biodex                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Date of acquisition       Sep. 01, 2020              
Segment       Medical              
Goodwill       $ 11.1              
Amortizable intangible assets       6.6              
Cash       4.1              
Accounts receivable       4.0              
Inventory       6.4              
Property, Plant and Equipment       1.0              
Other current and non-current assets       0.6              
Current liabilities       (2.6)              
Deferred contract revenue       (0.2)              
Other long-term liabilities       0.0              
Net tangible assets acquired       13.3              
Purchase consideration       31.0              
Less: cash acquired       (4.1)              
GAAP purchase consideration, net of cash acquired       26.9              
Acquiree revenue post acquisition through the period ended       32.6              
Acquiree income (loss) from operations post acquisition through the period ended       0.7              
Medical | Biodex | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets       2.3              
Medical | Biodex | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets       2.6              
Medical | Biodex | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets       1.4              
Medical | Biodex | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets       $ 0.3              
Medical | SNC                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Date of acquisition     Dec. 18, 2020                
Segment     Medical                
Goodwill     $ 130.2                
Amortizable intangible assets     125.5                
Cash     18.8                
Accounts receivable     24.0                
Inventory     13.9                
Property, Plant and Equipment     5.9                
Other current and non-current assets     8.0                
Current liabilities     (9.3)                
Deferred contract revenue     (6.5)                
Other long-term liabilities     (33.6)                
Net tangible assets acquired     21.2                
Purchase consideration     276.9                
Less: cash acquired     (18.8)                
GAAP purchase consideration, net of cash acquired     258.1                
Acquiree revenue post acquisition through the period ended     48.9                
Acquiree income (loss) from operations post acquisition through the period ended     (5.5)                
Payments to acquire businesses gross         $ 261.9            
Business combination, deferred consideration         $ 15.0            
Medical | SNC | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets     59.5                
Medical | SNC | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets     46.5                
Medical | SNC | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets     12.0                
Medical | SNC | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets     $ 7.5                
Industrial | Mirion TopCo                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Segment   Industrial                  
Goodwill   $ 963.8                  
Amortizable intangible assets   490.5                  
Cash   39.5                  
Accounts receivable   70.3                  
Cost in excess of billings   63.6                  
Inventory   119.5                  
Property, Plant and Equipment   72.7                  
Other current and non-current assets   13.2                  
Right of use assets   20.1                  
Other non-current assets   9.0                  
Current liabilities   (82.7)                  
Current lease liability   (4.4)                  
Deferred contract revenue   (24.2)                  
Notes payable assumed   (1.1)                  
Other long-term liabilities   (147.7)                  
Minority interest   (2.0)                  
Net tangible assets acquired   145.8                  
Industrial | Mirion TopCo | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   186.1                  
Industrial | Mirion TopCo | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   168.3                  
Industrial | Mirion TopCo | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   63.7                  
Industrial | Mirion TopCo | Distributor relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   8.6                  
Industrial | Mirion TopCo | Backlog and other                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   63.8                  
Industrial | Mirion TopCo | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   $ 0.0                  
Corporate and other | Mirion TopCo                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Segment   Corporate                  
Amortizable intangible assets   $ 0.0                  
Cash   54.6                  
Accounts receivable   0.0                  
Cost in excess of billings   0.0                  
Inventory   0.0                  
Property, Plant and Equipment   1.1                  
Other current and non-current assets   5.3                  
Right of use assets   0.9                  
Other non-current assets   0.0                  
Current liabilities   (33.7)                  
Current lease liability   (0.3)                  
Deferred contract revenue   0.0                  
Notes payable assumed   0.0                  
Other long-term liabilities   (23.8)                  
Minority interest   (0.1)                  
Net tangible assets acquired   4.0                  
Corporate and other | Mirion TopCo | Customer relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   0.0                  
Corporate and other | Mirion TopCo | Developed technology                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   0.0                  
Corporate and other | Mirion TopCo | Trade names                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   0.0                  
Corporate and other | Mirion TopCo | Distributor relationships                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   0.0                  
Corporate and other | Mirion TopCo | Backlog and other                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   0.0                  
Corporate and other | Mirion TopCo | Noncompete Agreements                      
Business Combination, Separately Recognized Transactions [Line Items]                      
Amortizable intangible assets   $ 0.0