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Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 09, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]          
General and administration   $ 82.4 $ 86.0 $ 259.4 $ 261.6
Corporate          
Related Party Transaction [Line Items]          
Corporate general and administrative expenses   28.4 25.2 87.6 76.2
Related Party | Lionsgate Corporate          
Related Party Transaction [Line Items]          
General and administration   28.4   87.6  
General and Administrative Expenses Allocated to Parent | Related Party          
Related Party Transaction [Line Items]          
Amounts of transaction $ 10.0        
Expenses Allocated After Separation | Related Party | Lionsgate Corporate          
Related Party Transaction [Line Items]          
General and administration   $ 28.4   73.4  
Corporate Expense Allocation Excluding Share-Based Compensation | Corporate          
Related Party Transaction [Line Items]          
Corporate general and administrative expenses     $ 25.2 $ 14.2 $ 76.2