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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, 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 $ 411.5 $ 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 822.0 827.2
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 695.1 776.0
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 1,193.8 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 185.2 223.7
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 122.2 140.8
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 67.9 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 232.7 229.4
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 412.8 415.4
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 824.4 817.1
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 475.5 510.0
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 1,198.9 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 186.6 226.0
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 124.8 143.8
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 67.9 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 $ 234.3 $ 231.8