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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 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | ---
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% |
Carrying Value | Term Loans | 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 | $ 404.1 | $ 424.2
Carrying Value | Term Loans | 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 | 819.5 | 827.2
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 and Programming Notes, fair value disclosure | 695.8 | 776.0
Carrying Value | Production Loans | Production 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 | 1,275.4 | 1,346.1
Carrying Value | Secured Debt | Backlog Facility and Other |  |
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] |  |
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure | 173.9 | 223.7
Carrying Value | Secured Debt | IP Credit Facility |  |
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] |  |
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure | 114.9 | 140.8
Carrying Value | Programming Notes | Programming 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 and Programming Notes, fair value disclosure | 60.4 | 83.6
Carrying Value | Line of Credit | Production Tax Credit Facility |  |
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] |  |
Production Tax Credit Facility, fair value disclosure | 248.4 | 229.4
Fair Value | Fair Value (Level 2) | Term Loans | 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 | 403.0 | 415.4
Fair Value | Fair Value (Level 2) | Term Loans | 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 | 814.1 | 817.1
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 and Programming Notes, fair value disclosure | 536.2 | 510.0
Fair Value | Fair Value (Level 2) | Production Loans | Production 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 | 1,279.2 | 1,349.9
Fair Value | Fair Value (Level 2) | Secured Debt | Backlog Facility and Other |  |
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] |  |
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure | 175.0 | 226.0
Fair Value | Fair Value (Level 2) | Secured Debt | IP Credit Facility |  |
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] |  |
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure | 117.3 | 143.8
Fair Value | Fair Value (Level 2) | Programming Notes | Programming 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 and Programming Notes, fair value disclosure | 60.4 | 83.6
Fair Value | Fair Value (Level 2) | Line of Credit | Production Tax Credit Facility |  |
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] |  |
Production Tax Credit Facility, fair value disclosure | $ 250.0 | $ 231.8

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