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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Apr. 11, 2019
Projected benefit obligation:        
Balance, January 1 and April 11   $ 816,000,000.0 $ 848,500,000  
Interest cost $ 21,300,000 21,700,000 25,400,000  
Service cost 1,500,000 1,500,000 100,000  
Actuarial loss (gain)   44,000,000.0 97,700,000  
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     (6,600,000)  
Benefits paid (34,500,000)   (59,200,000)  
Foreign currency adjustments 200,000      
Balance, December 31 848,500,000 848,500,000 902,600,000  
Plan assets        
Fair value, January 1 and April 11   576,800,000 598,900,000  
Actual return   43,600,000 57,900,000  
Employer contributions   12,800,000 11,500,000  
Foreign currency adjustments (200,000) 34,100,000 58,600,000  
Fair value, December 31 598,900,000 598,900,000 603,100,000  
Accumulated contributions in excess of (less than) net periodic benefit cost (222,100,000) (222,100,000) (195,400,000)  
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (2,900,000) (2,900,000) (2,900,000) $ (19,200,000)
Other liabilities (long-term) (246,700,000) (246,700,000) (296,600,000)  
Net benefit liabilities (249,600,000) (249,600,000) (299,500,000) (239,300,000)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (27,500,000) (27,500,000) (104,100,000)  
Total accumulated other comprehensive loss $ (27,500,000) $ (27,500,000) $ (104,100,000)  
Weighted-average assumptions:        
Cash balance interest credit rate 3.29% 3.29% 2.94%  
Curtailment gain recognized (2) $ 0   $ (3,300,000)  
Pension Benefits        
Projected benefit obligation:        
Balance, January 1 and April 11   $ 800,100,000 832,400,000  
Interest cost   21,300,000 24,900,000  
Service cost   1,500,000 100,000  
Actuarial loss (gain)   43,800,000 97,800,000  
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     (6,600,000)  
Benefits paid   (200,000) 0  
Foreign currency adjustments   (34,100,000) (58,600,000)  
Balance, December 31 832,400,000 832,400,000 886,700,000  
Plan assets        
Fair value, January 1 and April 11   576,800,000 598,900,000  
Actual return   43,600,000 57,900,000  
Employer contributions   12,800,000 11,500,000  
Benefits paid   (200,000) 0  
Foreign currency adjustments   34,100,000 58,600,000  
Fair value, December 31 598,900,000 598,900,000 603,100,000  
Accumulated contributions in excess of (less than) net periodic benefit cost (206,200,000) (206,200,000) (179,600,000)  
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (1,400,000) (1,400,000) (1,500,000)  
Other liabilities (long-term) (232,100,000) (232,100,000) (282,100,000)  
Net benefit liabilities (233,500,000) (233,500,000) (283,600,000) $ (202,100,000)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (27,300,000) (27,300,000) (104,000,000.0)  
Total accumulated other comprehensive loss $ (27,300,000) $ (27,300,000) $ (104,000,000.0)  
Weighted-average assumptions:        
Discount rate 3.16% 3.16% 2.30%  
Curtailment gain recognized (2)     $ (3,300,000)  
Other Benefits        
Projected benefit obligation:        
Balance, January 1 and April 11   $ 15,900,000 16,100,000  
Interest cost   400,000 500,000  
Service cost   0 0  
Actuarial loss (gain)   200,000 (100,000)  
Benefits paid   0 0  
Foreign currency adjustments   (400,000) (600,000)  
Balance, December 31 $ 16,100,000 16,100,000 15,900,000  
Plan assets        
Fair value, January 1 and April 11   0 0  
Actual return   0 0  
Employer contributions   0 0  
Benefits paid   0 0  
Foreign currency adjustments   0 0  
Fair value, December 31 0 0 0  
Accumulated contributions in excess of (less than) net periodic benefit cost (15,900,000) (15,900,000) (15,800,000)  
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (1,500,000) (1,500,000) (1,400,000)  
Other liabilities (long-term) (14,600,000) (14,600,000) (14,500,000)  
Net benefit liabilities (16,100,000) (16,100,000) (15,900,000)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (200,000) (200,000) (100,000)  
Total accumulated other comprehensive loss $ (200,000) $ (200,000) $ (100,000)  
Weighted-average assumptions:        
Discount rate 3.06% 3.06% 2.19%