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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
 4 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Projected benefit obligation:          
BALANCE at the beginning of the period $ 902,600,000 $ 840,900,000   $ 848,500,000  
Interest cost 6,600,000 15,600,000 $ 21,300,000 25,400,000  
Service cost 0 0 1,500,000 100,000  
Actuarial loss (gain) (56,000,000.0) 16,400,000   97,700,000  
Plan settlements 0 (25,900,000)   (6,600,000)  
Curtailment gain recognized (2) 0 0 0 (3,300,000)  
Plan amendments   200,000      
Benefits paid (12,300,000) (26,000,000.0)   (59,200,000)  
Net transfer in/(out) (including the effect of any business combinations/divestitures)   22,300,000      
BALANCE at the end of the period 840,900,000 843,500,000 848,500,000 902,600,000 $ 848,500,000
Plan assets          
Fair value, at the beginning of the period 603,100,000 652,000,000.0   598,900,000  
Actual return 38,500,000 31,800,000   57,900,000  
Employer contributions 22,500,000 2,400,000   11,500,000  
Foreign currency adjustments 12,100,000 25,700,000   58,600,000  
Fair value, at the end of the period 652,000,000.0 634,600,000 598,900,000 603,100,000 598,900,000
Accumulated contributions in excess of (less than) net periodic benefit cost (188,900,000) (199,800,000)   (195,400,000)  
Amounts recognized in Consolidated Balance Sheet:          
Accrued liabilities (2,800,000) (4,900,000)   (2,900,000)  
Other liabilities (long-term) (186,100,000) (204,000,000.0)   (296,600,000)  
Net benefit liabilities (188,900,000) (208,900,000)   (299,500,000)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]          
Actuarial gain (loss) 0 (8,900,000)   (104,100,000)  
Prior service credit (cost)   (200,000)      
Total accumulated other comprehensive income (loss) $ 0 $ (9,100,000)   $ (104,100,000)  
Weighted-average assumptions:          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.81%        
Cash balance interest credit rate 2.94% 3.05%   2.94%  
Savings Plan [Member]          
Plan assets          
Employer contributions       $ 8,800,000 18,700,000
Pension Benefits          
Projected benefit obligation:          
BALANCE at the beginning of the period $ 886,700,000 $ 826,100,000   832,400,000  
Interest cost 6,500,000 15,300,000   24,900,000  
Service cost 0 0   100,000  
Actuarial loss (gain) (55,000,000.0) 20,600,000   97,800,000  
Plan settlements 0 (25,900,000)   (6,600,000)  
Curtailment gain recognized (2) 0 0   (3,300,000)  
Plan amendments   200,000      
Foreign currency adjustments (12,100,000) (25,700,000)   (58,600,000)  
Net transfer in/(out) (including the effect of any business combinations/divestitures)   17,300,000      
BALANCE at the end of the period 826,100,000 827,900,000 832,400,000 886,700,000 832,400,000
Plan assets          
Fair value, at the beginning of the period 603,100,000 652,000,000.0   598,900,000  
Actual return 38,500,000 31,800,000   57,900,000  
Employer contributions 22,500,000 2,400,000   11,500,000  
Foreign currency adjustments 12,100,000 25,700,000   58,600,000  
Fair value, at the end of the period 652,000,000.0 634,600,000 598,900,000 603,100,000 598,900,000
Accumulated contributions in excess of (less than) net periodic benefit cost (174,100,000) (180,000,000.0)   (179,600,000)  
Amounts recognized in Consolidated Balance Sheet:          
Accrued liabilities (1,400,000) (3,800,000)   (1,500,000)  
Other liabilities (long-term) (172,700,000) (189,500,000)   (282,100,000)  
Net benefit liabilities (174,100,000) (193,300,000)   (283,600,000)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]          
Actuarial gain (loss) 0 (13,100,000)   (104,000,000.0)  
Prior service credit (cost)   (200,000)      
Total accumulated other comprehensive income (loss) $ 0 $ (13,300,000)   $ (104,000,000.0)  
Weighted-average assumptions:          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.84% 2.73%   2.30%  
Other Benefits          
Projected benefit obligation:          
BALANCE at the beginning of the period $ 15,900,000 $ 14,800,000   $ 16,100,000  
Interest cost 100,000 300,000   500,000  
Service cost 0 0   0  
Actuarial loss (gain) (1,000,000.0) (4,200,000)   (100,000)  
Foreign currency adjustments (200,000) (300,000)   (600,000)  
Net transfer in/(out) (including the effect of any business combinations/divestitures)   5,000,000.0      
BALANCE at the end of the period 14,800,000 15,600,000 16,100,000 15,900,000 16,100,000
Plan assets          
Fair value, at the beginning of the period 0 0   0  
Actual return 0 0   0  
Employer contributions 0 0   0  
Foreign currency adjustments 0 0   0  
Fair value, at the end of the period 0 0 $ 0 0 $ 0
Accumulated contributions in excess of (less than) net periodic benefit cost (14,800,000) (19,800,000)   (15,800,000)  
Amounts recognized in Consolidated Balance Sheet:          
Accrued liabilities (1,400,000) (1,100,000)   (1,400,000)  
Other liabilities (long-term) (13,400,000) (14,500,000)   (14,500,000)  
Net benefit liabilities (14,800,000) (15,600,000)   (15,900,000)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]          
Actuarial gain (loss) 0 4,200,000   (100,000)  
Prior service credit (cost)   0      
Total accumulated other comprehensive income (loss) $ 0 $ 4,200,000   $ (100,000)  
Weighted-average assumptions:          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.73% 2.72%   2.19%