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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, 2021 | Apr. 01, 2021 | Mar. 31, 2021
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Other Non-Current Assets | Interest rate swaps, financing element |  |  |
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] |  |  |
Financing element of certain hybrid instruments | $ 93.1 |  | $ 98.2
Senior Notes | 5.500% 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 | 5.50% | 5.50% |
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% | 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% | 6.375% |
Carrying Value |  |  |
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] |  |  |
Financing component of interest rate swaps, fair value disclosure | $ 143.3 |  | 152.5
Carrying Value | Term Loan | Term Loan A |  |  |
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] |  |  |
Loans, fair value disclosure | 641.3 |  | 651.4
Carrying Value | Term Loan | Term Loan B |  |  |
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] |  |  |
Loans, fair value disclosure | 842.7 |  | 942.8
Carrying Value | Senior Notes | 5.500% 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] |  |  |
Senior Notes, fair value disclosure | 963.8 |  | 0.0
Carrying Value | 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] |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 506.7
Carrying Value | 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] |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 540.8
Carrying Value | Production And Related Loans | Production And Related Loans |  |  |
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] |  |  |
Loans, fair value disclosure | 867.5 |  | 489.0
Carrying Value | Line of Credit | IP Credit Facility And Other Financing Obligations |  |  |
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] |  |  |
IP Credit Facility and other financing obligations, fair value disclosure | 212.3 |  | 0.0
Fair Value | Fair Value (Level 2) |  |  |
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] |  |  |
Financing component of interest rate swaps, fair value disclosure | 136.6 |  | 144.7
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A |  |  |
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] |  |  |
Loans, fair value disclosure | 620.8 |  | 647.6
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B |  |  |
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] |  |  |
Loans, fair value disclosure | 844.0 |  | 936.0
Fair Value | Fair Value (Level 2) | Senior Notes | 5.500% 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] |  |  |
Senior Notes, fair value disclosure | 1,027.5 |  | 0.0
Fair Value | Fair Value (Level 2) | 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] |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 533.9
Fair Value | Fair Value (Level 2) | 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] |  |  |
Senior Notes, fair value disclosure | 0.0 |  | 563.0
Fair Value | Fair Value (Level 2) | Production And Related Loans | Production And Related Loans |  |  |
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] |  |  |
Loans, fair value disclosure | 871.9 |  | 493.5
Fair Value | Fair Value (Level 2) | Line of Credit | IP Credit Facility And Other Financing Obligations |  |  |
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] |  |  |
IP Credit Facility and other financing obligations, fair value disclosure | $ 215.0 |  | $ 0.0

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