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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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