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Segment Information - Schedule of Reconciliation of Total Segment Assets to Total Consolidated Assets (Details) - USD ($)
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 2,173,200,000 $ 2,139,100,000
Continuing Operations | International    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 6,500,000 11,200,000
Discontinued Operations    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 0 37,000,000.0
Operating Segments | Starz Networks [Member] | Continuing Operations    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,017,800,000 2,001,800,000
Other unallocated assets | Continuing Operations    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 148,900,000 $ 89,100,000