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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Goodwill [Roll Forward]      
Goodwill, balance at beginning of period $ 811.2    
Measurement period adjustments (2.7)    
Goodwill, balance at end of period 808.5    
Adjustment to purchase price from settlement of certain working capital items 12.0 $ 0.0  
eOne      
Goodwill [Roll Forward]      
Measurement period adjustments 2.7    
Goodwill, balance at end of period 12.9    
Decrease to accounts receivable 5.6    
Decrease in investment in films and television programs 1.6    
Increase to content related payables 3.4    
Increase to participation and residuals 1.0    
Increase to other liabilities 1.9    
Increase to other assets 4.2    
Motion Picture      
Goodwill [Roll Forward]      
Goodwill, balance at beginning of period 398.6    
Measurement period adjustments (1.7)    
Goodwill, balance at end of period 396.9    
Television Production      
Goodwill [Roll Forward]      
Goodwill, balance at beginning of period 412.6    
Measurement period adjustments (1.0)    
Goodwill, balance at end of period 411.6    
Media Networks      
Goodwill [Roll Forward]      
Goodwill, balance at beginning of period 0.0    
Measurement period adjustments 0.0    
Goodwill, balance at end of period 0.0    
Accumulated goodwill impairment losses $ 1,969.0   $ 1,969.0