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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, 2024	Mar. 31, 2024
Senior Notes | 5.5% 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 | Revolving Credit Facility | Revolving 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]
Lines of credit, fair value disclosure	$ 386.8	$ 569.9
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	313.1	396.6
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	0.0	816.9
Carrying Value | Senior Notes | 5.5% 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	699.1	696.6
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	1,342.3	1,286.2
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	178.6	285.4
Carrying Value | Secured Debt | Film Library 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	85.7	107.6
Carrying Value | Secured Debt | eOne 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]
Lines of credit, fair value disclosure	325.8	0.0
Carrying Value | Secured Debt | LG 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]
Lines of credit, fair value disclosure	836.0	0.0
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	75.8	0.0
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]
Lines of credit, fair value disclosure	257.7	258.7
Fair Value | Fair Value (Level 2) | Revolving Credit Facility | Revolving 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]
Lines of credit, fair value disclosure	390.0	575.0
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	313.6	397.3
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	0.0	818.1
Fair Value | Fair Value (Level 2) | Senior Notes | 5.5% 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	604.9	536.2
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	1,346.0	1,292.2
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	179.0	287.3
Fair Value | Fair Value (Level 2) | Secured Debt | Film Library 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	87.5	109.9
Fair Value | Fair Value (Level 2) | Secured Debt | eOne 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]
Lines of credit, fair value disclosure	331.5	0.0
Fair Value | Fair Value (Level 2) | Secured Debt | LG 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]
Lines of credit, fair value disclosure	850.0	0.0
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	75.8	0.0
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]
Lines of credit, fair value disclosure	$ 257.8	$ 260.0

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