Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Income Tax Contingencies (Details)

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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($)
$ in Millions
 2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Oct. 19, 2021
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance, beginning of period $ 6.5 $ 5.0 $ 0.8 $ 13.9
Increases resulting from the Mirion Business Combination 6.5 0.0 0.0 0.0
Current year additions to positions 0.1 1.5 2.6 0.0
Additions from other business combinations 0.2 0.0 1.7 0.0
Lapse of applicable statute of limitations 0.0 0.0 0.1 13.1
Reductions to prior year positions (0.2) 0.0 0.0 0.0
Foreign currency translation adjustments 0.0 0.0 0.0 0.0
Balance, end of period 6.6 6.5 $ 5.0 $ 0.8
GSAH        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance, beginning of period $ 0.0      
Balance, end of period   $ 0.0