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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, 2024 | Mar. 31, 2023 | Apr. 01, 2021
--- | --- | --- | ---
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%
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 | $ 396.6 | $ 424.2 |
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 | 816.9 | 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 | 696.6 | 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 | 1,286.2 | 1,346.1 |
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 | 258.7 | 229.4 |
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 | 0.0 | 83.6 |
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 | 285.4 | 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 | 107.6 | 140.8 |
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 | 397.3 | 415.4 |
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 | 818.1 | 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 | 1,292.2 | 1,349.9 |
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 | 260.0 | 231.8 |
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 | 0.0 | 83.6 |
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 | 287.3 | 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 | $ 109.9 | $ 143.8 |

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