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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period $ 1,289.5  
Acquisition of eOne 5.8  
Impairment (493.9)  
Goodwill, balance at end of period 801.4  
Motion Picture    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 393.7  
Acquisition of eOne 1.0  
Impairment 0.0  
Goodwill, balance at end of period 394.7  
Television Production    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 401.9  
Acquisition of eOne 4.8  
Impairment 0.0  
Goodwill, balance at end of period 406.7  
Media Networks    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 493.9  
Acquisition of eOne 0.0  
Impairment (493.9)  
Goodwill, balance at end of period 0.0  
Accumulated goodwill impairment losses $ 1,969.0 $ 1,475.0