Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (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
Jun. 30, 2020
Income Tax Examination [Line Items]            
Capitalized research and development     $ 10.1 $ 5.6    
Valuation allowance $ 20.7 $ 30.7 30.0 23.9 $ 29.1 $ 29.0
Increase (decrease) in valuation allowance   1.6 6.1 3.2 0.1  
Increases/(decreases) resulting from the Mirion Business Combination 19.7 0.0 0.0 (0.4) 0.0  
Tax credit carryforwards     4.4      
Unrecognized tax benefits 6.6 $ 6.5 8.4 6.9 5.0 $ 0.8
Unrecognized tax benefits that would impact effective tax rate       6.3    
Deferred tax liabilities unrecognized tax benefits 3.5   1.3 3.4 2.9  
Interest and penalties 0.9   1.2 0.9 0.6  
Noncurrent Income Tax Payable            
Income Tax Examination [Line Items]            
Unrecognized tax benefits $ 3.1   7.1 $ 3.5 $ 2.1  
Minimum            
Income Tax Examination [Line Items]            
Unrecognized tax benefits     0.0      
Maximum            
Income Tax Examination [Line Items]            
Unrecognized tax benefits     1.0      
United States—State            
Income Tax Examination [Line Items]            
Operating loss carryforwards     47.8      
Foreign Jurisdiction            
Income Tax Examination [Line Items]            
Operating loss carryforwards     60.6      
US Controlled Foreign Corporations            
Income Tax Examination [Line Items]            
Amount of unrecognized deferred tax liability related to foreign subsidiaries     21.2      
Undistributed earnings of foreign subsidiaries     $ 182.9