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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Examination [Line Items]        
Notional interest deduction ("NID") $ 40.0 $ 40.0 $ 0.0  
State charitable contribution carryover ("SCCCs") 0.7 0.7 0.9  
Deferred tax liabilities 2.0 2.0    
Accrued income taxes 1.6 1.6    
Unrecognized tax benefits 4.5 4.5 17.6  
Income tax penalties and interest expense, benefit   4.0 6.9  
Accrued interest and penalties 1.0 1.0 5.0  
Settlements of uncertain tax positions with tax authorities   34.0 0.0  
Tax benefit     14.7  
Tax liability     37.8  
Income tax benefit (provision) 4.8 (103.4) $ (119.0) $ (198.3)
Income taxes receivable, current 24.8 24.8    
Tax deposit 7.6 7.6    
Deferred tax assets 21.6 21.6    
Income taxes receivable, noncurrent 30.1 30.1    
US State        
Income Tax Examination [Line Items]        
Operating loss carryforwards, valuation allowance 56.3 56.3    
Foreign        
Income Tax Examination [Line Items]        
Operating loss carryforwards, valuation allowance $ 29.5 29.5    
Danish Tax Authority (SKAT)        
Income Tax Examination [Line Items]        
Income tax benefit, net   8.9    
Income tax benefit, gross   10.5    
Overpayment of interest   $ 1.6