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
Oct. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Selling, general and administrative $ 70.1 $ 101.6 $ 211.2 $ 158.1 $ 145.4
Total operating expenses 76.8 111.9 240.6 174.0 159.4
(Loss) income from operations (22.9) (41.6) 11.2 23.0 28.8
Change in fair values of warrant liabilities (1.2) 0.0 0.0 0.0 0.0
Loss before benefit from income taxes (29.8) (111.3) (164.3) (124.6) (126.2)
Total benefit from income taxes (6.8) (5.6) (5.9) (5.5) (4.2)
Net loss (23.0) (105.7) (158.4) (119.1) (122.0)
Loss attributable to noncontrolling interests (0.8) 0.0 (0.1) 0.0 0.0
Net loss attributable to Mirion Technologies, Inc. stockholders (22.2) (105.7) (158.3) (119.1) (122.0)
Foreign currency translation, net of tax (20.5) (7.5) 34.2 (9.3) (15.1)
Unrecognized actuarial (loss) gain and prior service benefit, net of tax (0.2) 0.6 0.9 0.0 (1.5)
Other comprehensive loss (income), net of tax (20.7) (6.9) 35.1 (9.3) (16.6)
Comprehensive loss attributable to Mirion Technologies, Inc. stockholders (42.9) (112.6) (123.2) (128.4) (138.6)
Comprehensive loss $ 43.7 $ 112.6 $ 123.3 $ 128.4 $ 138.6
Loss per share—basic (in dollars per share) $ (0.12) $ (15.81) $ (24.18) $ (18.45) $ (19.36)
Loss per share—diluted (in dollars per share) $ (0.12) $ (15.81) $ (24.18) $ (18.45) $ (19.36)
Weighted average common shares outstanding — basic (in shares) 180,773,000 6,685,000 6,549,000 6,453,000 6,300,000
Weighted average common shares outstanding — diluted (in shares) 180,773,000 6,685,000 6,549,000 6,453,000 6,300,000
Parent Company | MIRION TECHNOLOGIES LTD          
Selling, general and administrative $ 5.3        
Total operating expenses 5.3        
(Loss) income from operations (5.3)        
Change in fair values of warrant liabilities (1.2)        
Equity in net loss of subsidiaries 19.9 $ (105.7) $ (158.3) $ (119.1) $ (122.0)
Loss before benefit from income taxes (24.0)        
Total benefit from income taxes (1.0)        
Net loss (23.0) (105.7) (158.3) (119.1) (122.0)
Loss attributable to noncontrolling interests (0.8)        
Net loss attributable to Mirion Technologies, Inc. stockholders (22.2)        
Foreign currency translation, net of tax (20.5) (7.5) 34.2 (9.3) (15.1)
Unrecognized actuarial (loss) gain and prior service benefit, net of tax (0.2) 0.6 0.9 0.0 (1.5)
Other comprehensive loss (income), net of tax (20.7) (6.9) 35.1 (9.3) (16.6)
Comprehensive loss attributable to Mirion Technologies, Inc. stockholders $ (42.9)        
Comprehensive loss   $ 112.6 $ 123.2 $ 128.4 $ 138.6
Loss per share—basic (in dollars per share) $ (0.12) $ (15.81) $ (24.18) $ (18.45) $ (19.36)
Loss per share—diluted (in dollars per share) $ (0.12) $ (15.81) $ (24.18) $ (18.45) $ (19.36)
Weighted average common shares outstanding — basic (in shares) 180,773,000 6,685,000 6,549,000 6,453,000 6,300,000
Weighted average common shares outstanding — diluted (in shares) 180,773,000 6,685,000 6,549,000 6,453,000 6,300,000