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Segment Information (Reconciliation of Total Assets By Segment to Consolidated Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Mar. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 7,154.7 $ 7,426.2
Operating segments | Motion Picture    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,744.2 1,759.4
Operating segments | Television Production    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,406.2 1,949.1
Operating segments | Media Networks    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,180.9 3,120.8
Other unallocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 823.4 $ 596.9