Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Financial Information of the Registrant - CONDENSED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS INCOME (Details)

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Schedule I - Condensed Financial Information of the Registrant - CONDENSED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS INCOME (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Oct. 19, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Condensed Statement of Income Captions [Line Items]              
Selling, general and administrative $ 70.1   $ 101.6 $ 340.1 $ 362.3   $ 211.2
Total operating expenses 76.8   111.9 378.3 607.9   240.6
(Loss) income from operations (22.9)   (41.6) (21.9) (297.8)   11.2
Increase (decrease) in fair values of warrant liabilities (1.2)   0.0 24.8 (37.6)   0.0
Other (income) expense, net 0.3   1.6 (0.8) (0.4)   (1.1)
Loss before income taxes (29.8)   (111.3) (105.3) (306.6)   (164.3)
Benefit from income taxes (6.8)   (5.6) (6.6) (18.2)   (5.9)
Net loss (23.0) $ (23.0) (105.7) (98.7) (288.4) $ (158.4) (158.4)
Loss attributable to noncontrolling interests (0.8)   0.0 (1.8) (11.5)   (0.1)
Net loss attributable to Mirion Technologies, Inc. stockholders (22.2)   (105.7) (96.9) (276.9)   (158.3)
Foreign currency translation, net of tax (20.5)   (7.5) 18.8 (50.3) 34.2  
Unrecognized actuarial (loss) gain and prior service benefit, net of tax (0.2)   0.6 (0.1) 2.0 0.9  
Other comprehensive income (loss), net of tax (20.7) $ (20.7) (6.9) 10.8 (58.3) 35.1 $ 35.1
Comprehensive loss (43.7)   (112.6) (87.9) (346.7) (123.3)  
Comprehensive loss attributable to Mirion Technologies, Inc. stockholders $ (42.9)   $ (112.6) $ (86.5) $ (331.9) $ (123.2)  
Loss per share—basic (in dollars per share) $ (0.12)   $ (15.81) $ (0.49) $ (1.53)   $ (24.18)
Loss per share—diluted (in dollars per share) $ (0.12)   $ (15.81) $ (0.49) $ (1.53)   $ (24.18)
Weighted average common shares outstanding — basic (in shares) 180,773,000   6,685,000 196,369,000 181,149,000   6,549,000
Weighted average common shares outstanding — diluted (in shares) 180,773,000   6,685,000 196,369,000 181,149,000   6,549,000
Parent Company              
Condensed Statement of Income Captions [Line Items]              
Selling, general and administrative $ 5.3     $ 22.5 $ 31.2    
Total operating expenses 5.3     22.5 31.2    
(Loss) income from operations (5.3)     (22.5) (31.2)    
Increase (decrease) in fair values of warrant liabilities (1.2)     24.8 (37.6)    
Equity in net loss of subsidiaries 19.9   $ (105.7) 51.1 294.8   $ (158.3)
Other (income) expense, net 0.0     0.3 0.0    
Loss before income taxes (24.0)     (98.7) (288.4)    
Benefit from income taxes (1.0)     0.0 0.0    
Net loss (23.0)   (105.7) (98.7) (288.4)   (158.3)
Loss attributable to noncontrolling interests (0.8)     (1.8) (11.5)    
Net loss attributable to Mirion Technologies, Inc. stockholders (22.2)     (96.9) (276.9)    
Foreign currency translation, net of tax (20.5)   (7.5) (0.3) 4.9   34.2
Unrecognized actuarial (loss) gain and prior service benefit, net of tax (0.2)   0.6 0.0 2.0   0.9
Other comprehensive income (loss), net of tax (20.7)   (6.9) (0.3) 2.9   35.1
Comprehensive loss     $ (112.6)       $ (123.2)
Comprehensive loss attributable to Mirion Technologies, Inc. stockholders $ (42.9)     $ (97.2) $ (274.0)    
Loss per share—basic (in dollars per share) $ (0.12)     $ (0.49) $ (1.53)    
Loss per share—diluted (in dollars per share) $ (0.12)   $ (15.81) $ (0.49) $ (1.53)   $ (24.18)
Weighted average common shares outstanding — basic (in shares) 180,773,000     196,369,000 181,149,000   6,549,000
Weighted average common shares outstanding — diluted (in shares) 180,773,000   6,685,000 196,369,000 181,149,000