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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Apr. 11, 2019
Dec. 31, 2018
Projected benefit obligation:        
Balance, April 11   $ 816.0    
Interest cost   21.7    
Service cost   1.5    
Actuarial loss   44.0    
Benefits paid   (34.5)    
Foreign currency adjustments   (0.2)    
Balance, December 31 $ 848.5 848.5    
Plan assets        
Fair value, April 11   576.8    
Actual return   43.6    
Employer contributions   12.8    
Benefits paid   (34.1)    
Foreign currency adjustments   0.2    
Fair value, December 31 598.9 598.9    
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (2.9) (2.9) $ (19.2)  
Other liabilities (long-term) (246.7) (246.7)   $ 0.0
Net benefit liabilities (249.6) (249.6) (239.3)  
Accumulated contributions in excess of (less than) net periodic benefit cost (222.1) (222.1)    
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (27.5) (27.5)    
Total accumulated other comprehensive loss (27.5) (27.5)    
Pension Benefits        
Projected benefit obligation:        
Balance, April 11   800.1    
Interest cost 21.3 21.3    
Service cost 1.5 1.5    
Actuarial loss   43.8    
Benefits paid   (34.1)    
Foreign currency adjustments   (0.2)    
Balance, December 31 832.4 832.4    
Plan assets        
Fair value, April 11   576.8    
Actual return   43.6    
Employer contributions   12.8    
Benefits paid   (34.1)    
Foreign currency adjustments   0.2    
Fair value, December 31 598.9 598.9    
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (1.4) (1.4)    
Other liabilities (long-term) (232.1) (232.1)    
Net benefit liabilities (233.5) (233.5) $ (202.1)  
Accumulated contributions in excess of (less than) net periodic benefit cost (206.2) (206.2)    
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (27.3) (27.3)    
Total accumulated other comprehensive loss $ (27.3) $ (27.3)    
Weighted-average assumptions:        
Discount rate 3.16% 3.16%    
Rate of compensation increase 0.00% 0.00%    
Other Benefits        
Projected benefit obligation:        
Balance, April 11   $ 15.9    
Interest cost   0.4    
Service cost   0.0    
Actuarial loss   0.2    
Benefits paid   (0.4)    
Foreign currency adjustments   0.0    
Balance, December 31 $ 16.1 16.1    
Plan assets        
Fair value, 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 0.0    
Amounts recognized in consolidated balance sheet:        
Accrued liabilities (1.5) (1.5)    
Other liabilities (long-term) (14.6) (14.6)    
Net benefit liabilities (16.1) (16.1)    
Accumulated contributions in excess of (less than) net periodic benefit cost (15.9) (15.9)    
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]        
Actuarial loss (0.2) (0.2)    
Total accumulated other comprehensive loss $ (0.2) $ (0.2)    
Weighted-average assumptions:        
Discount rate 3.06% 3.06%    
Rate of compensation increase 0.00% 0.00%