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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, 2024
Mar. 31, 2023
Apr. 01, 2021
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 | 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 $ 396.6 $ 424.2  
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 816.9 827.2  
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 696.6 776.0  
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 1,286.2 1,346.1  
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 258.7 229.4  
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 0.0 83.6  
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 285.4 223.7  
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 107.6 140.8  
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 397.3 415.4  
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 818.1 817.1  
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 1,292.2 1,349.9  
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 260.0 231.8  
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 0.0 83.6  
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 287.3 226.0  
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 $ 109.9 $ 143.8