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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 7,167.3 $ 7,092.7
Operating segments | Motion Picture    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,916.8 1,851.4
Operating segments | Television Production    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,555.6 2,347.8
Operating segments | Media Networks    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,091.9 2,036.7
Other unallocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 603.0 $ 856.8