Annual report pursuant to Section 13 and 15(d)

Business Combinations and Acquisitions - Narrative (Details)

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Business Combinations and Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Nov. 01, 2023
Aug. 01, 2022
Oct. 20, 2021
Feb. 28, 2021
Dec. 31, 2021
Mar. 31, 2023
Oct. 19, 2021
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Jun. 30, 2020
Dec. 01, 2021
Dec. 18, 2020
Business Combination, Separately Recognized Transactions [Line Items]                          
Goodwill         $ 1,662.6     $ 1,447.6 $ 1,418.0        
Business Combination and other acquisitions - measurement period adjustments                 $ 3.4        
Measurement Period Adjustment               $ 0.9          
Income tax at U.S. Federal statutory rate         21.00%     21.00% 21.00%        
EC5                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Cash consideration paid $ 31.4                        
Total amortizable intangible assets 14.5                        
Goodwill 17.4                        
Liabilities $ (0.5)                        
Critical Infrastructure                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Cash consideration paid   $ 6.6                      
Business Combination and other acquisitions - measurement period adjustments           $ 0.9              
Measurement Period Adjustment               $ 3.9          
Increase (decrease) in noncurrent deferred tax assets and liabilities, net               (4.3)          
Decrease in noncontrolling interest               1.8          
Increase (decrease) in other noncurrent assets and liabilities, net               (1.4)          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities, Other Accrued           $ (0.9)              
CIRS                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Equity interest, acquired percentage                       100.00%  
Measurement Period Adjustment               (1.0)          
Increase (decrease) in noncurrent deferred tax assets and liabilities, net               $ (1.0)          
CIRS | Medical                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Total amortizable intangible assets                       $ 21.8  
Goodwill                       $ 34.0  
Transaction expenses                 $ 0.4        
Intermediate Co                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Cash consideration paid     $ 1,300.0                    
Business acquisition share price (in dollars per share)     $ 10.00                    
Intermediate Co | Class A Common Stock                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Business acquisition equity interest issued or issuable (in shares)     30,401,902                    
Intermediate Co | Class B Common Stock                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Business acquisition equity interest issued or issuable (in shares)     8,560,540         7,787,333          
Mirion                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Total amortizable intangible assets     $ 821.0                    
Goodwill     1,642.9                    
Pro forma adjustments         $ 2.2   $ 26.2            
Income tax at U.S. Federal statutory rate         25.00%   25.00%     25.00%      
Mirion | Medical                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Total amortizable intangible assets     330.5                    
Goodwill     $ 680.4                    
Mirion | Fair Value Adjustment to Inventory                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Pro forma adjustments         $ 15.8   $ 15.8     $ 15.8      
Mirion | Acquisition-related Costs                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Pro forma adjustments         $ 28.4   $ 28.4     28.4      
Sun Nuclear                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Equity interest, acquired percentage                         100.00%
Sun Nuclear | Medical                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Cash consideration paid       $ 261.9                  
Total amortizable intangible assets                         $ 125.5
Goodwill                         $ 130.2
Transaction expenses                   $ 1.2      
Biodex and SNC                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Income tax at U.S. Federal statutory rate                   25.00% 25.00%    
Biodex and SNC | Fair Value Adjustment to Inventory                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Pro forma adjustments                   $ 5.2 $ 5.2    
Biodex and SNC | Acquisition-related Costs                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Pro forma adjustments                   4.8 4.8    
Biodex and SNC | Reduction In Revenues Due To The Elimination Of Deferred Contract Revenue                          
Business Combination, Separately Recognized Transactions [Line Items]                          
Pro forma adjustments                   $ 14.8 $ 14.8