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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, 2022
Mar. 31, 2022
Apr. 01, 2021
Other Non-Current Assets | Interest rate swaps, financing element      
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]      
Financing element of certain hybrid instruments $ 0.0 $ 88.1  
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      
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 $ 0.0 134.0  
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 429.5 631.9  
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 829.8 837.5  
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, fair value disclosure 831.0 965.8  
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 1,431.7 963.7  
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 231.2 0.0  
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 149.1 120.6  
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, fair value disclosure 54.2 96.4  
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 228.8 221.1  
Fair Value | Fair Value (Level 2)      
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 0.0 122.9  
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 412.1 625.7  
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 794.1 828.3  
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, fair value disclosure 500.3 962.5  
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 1,435.7 966.3  
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 233.6 0.0  
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 152.3 123.5  
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, fair value disclosure 54.2 96.4  
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 $ 231.2 $ 224.0