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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, 2023
Mar. 31, 2022
Apr. 01, 2021
Other Non-Current Assets | Interest Rate Swap, Financing      
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 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 424.2 631.9  
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 827.2 837.5  
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 and Programming Notes, fair value disclosure 776.0 965.8  
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 1,346.1 963.7  
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 223.7 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 140.8 120.6  
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 and Programming Notes, fair value disclosure 83.6 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 229.4 221.1  
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 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 415.4 625.7  
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 817.1 828.3  
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 and Programming Notes, fair value disclosure 510.0 962.5  
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 1,349.9 966.3  
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 226.0 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 143.8 123.5  
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 and Programming Notes, fair value disclosure 83.6 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 $ 231.8 $ 224.0