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Fair Value Measurements (Carrying Values of Assets and Liabilities Not Required to Be Carried at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | 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 | 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 | 539.2 | 541.4
Carrying Value | Production Loans | Production Loans |  |
Liabilities: |  |
Loans, fair value disclosure | 151.3 | 385.4
Carrying Value | Term Loan | Term Loan A |  |
Liabilities: |  |
Loans, fair value disclosure | 699.8 | 733.3
Carrying Value | Term Loan | Term Loan B |  |
Liabilities: |  |
Loans, fair value disclosure | 952.9 | 1,091.2
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes |  |
Liabilities: |  |
Senior Notes, fair value disclosure | 430.5 | 534.3
Fair Value | Fair Value (Level 2) | Senior Notes | 6.375% Senior Notes |  |
Liabilities: |  |
Senior Notes, fair value disclosure | 452.9 | 576.1
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans |  |
Liabilities: |  |
Loans, fair value disclosure | 151.3 | 386.4
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A |  |
Liabilities: |  |
Loans, fair value disclosure | 637.7 | 742.5
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B |  |
Liabilities: |  |
Loans, fair value disclosure | $ 845.7 | $ 1,088.1

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