Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Valuation Allowance (Details)

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Income Taxes - Summary of Valuation Allowance (Details) - USD ($)
$ in Millions
2 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2021
Oct. 19, 2021
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Valuation allowance balance – beginning of period $ 30.7 $ 29.1 $ 23.9 $ 20.7 $ 29.0
Increases/(decreases) resulting from the Mirion Business Combination 19.7 0.0 0.0 (0.4) 0.0
Increases resulting from other business combinations 0.0 0.0 0.0 0.0 0.5
Other increases 0.0 1.6 9.8 5.3 8.6
Other decreases 0.0 0.0 (3.7) (1.7) (9.0)
Valuation allowance balance – end of period $ 20.7 $ 30.7 $ 30.0 $ 23.9 $ 29.1