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Fair Value Measurements (Carrying Values And Fair Values Of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Senior Notes | 5.875% Senior Notes    
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]    
Coupon rate 5.875%  
Senior Notes | 6.375% Senior Notes    
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]    
Coupon rate 6.375%  
Carrying Value | Term Loan | Term Loan A Facility    
Liabilities:    
Loans, fair value disclosure $ 716.6 $ 733.3
Carrying Value | Term Loan | Term Loan B Facility    
Liabilities:    
Loans, fair value disclosure 1,086.2 1,091.2
Carrying Value | Senior Notes | 5.875% Senior Notes    
Liabilities:    
Senior Notes, fair value disclosure 504.0 502.8
Carrying Value | Senior Notes | 6.375% Senior Notes    
Liabilities:    
Senior Notes, fair value disclosure 542.8 541.4
Carrying Value | Production Loans | Production Loans    
Liabilities:    
Loans, fair value disclosure 269.0 385.4
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility    
Liabilities:    
Loans, fair value disclosure [1] 724.9 742.5
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility    
Liabilities:    
Loans, fair value disclosure [1] 1,098.5 1,088.1
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes    
Liabilities:    
Senior Notes, fair value disclosure [1] 534.3 534.3
Fair Value | Fair Value (Level 2) | Senior Notes | 6.375% Senior Notes    
Liabilities:    
Senior Notes, fair value disclosure [1] 578.9 576.1
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans    
Liabilities:    
Loans, fair value disclosure [1] $ 269.7 $ 386.4
[1]
The Company measures the fair value of its outstanding debt using discounted cash flow techniques that use observable market inputs, such as LIBOR-based yield curves, swap rates, and credit ratings (Level 2 measurements).