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Goodwill and Intangible Assets (Goodwill) (Details)
$ in Millions
 6 Months Ended
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period $ 1,289.5  
Impairment (493.9)  
Goodwill, balance at end of period 795.6  
Motion Picture    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 393.7  
Impairment 0.0  
Goodwill, balance at end of period 393.7  
Television Production    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 401.9  
Impairment 0.0  
Goodwill, balance at end of period 401.9  
Media Networks    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 493.9  
Impairment (493.9)  
Goodwill, balance at end of period 0.0  
Accumulated goodwill impairment losses $ 1,969.0 $ 1,475.0