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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).

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