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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 08, 2016
Goodwill [Line Items]              
Goodwill impairment charge         $ 493.9    
Impairment of Starz tradename indefinite lived intangible assets   $ 170.0          
Trade names intangible asset, estimated useful life   10 years          
Amortization $ 49.9   $ 46.3   $ 138.9 $ 133.9  
Decrease to basic net loss per share (in dollars per share) $ 0.45   $ (0.07)   $ 4.56 $ 8.41  
Decrease to diluted net loss per share (in dollars per share) $ 0.45   $ (0.07)   $ 4.56 $ 8.41  
Finite-lived intangible assets, net $ 1,028.5       $ 1,028.5    
Intangible Assets, Amortization Period              
Goodwill [Line Items]              
Amortization $ 2.0       $ 2.0    
Decrease to basic net loss per share (in dollars per share) $ 0.01       $ 0.01    
Decrease to diluted net loss per share (in dollars per share) $ 0.01       $ 0.01    
Trade Names              
Goodwill [Line Items]              
Indefinite-lived intangible assets - Starz tradename   $ 80.0          
Media Networks              
Goodwill [Line Items]              
Goodwill impairment charge   $ 493.9   $ 1,475.0      
Media Networks | Trade Names              
Goodwill [Line Items]              
Indefinite-lived intangible assets - Starz tradename             $ 250.0
Media Networks              
Goodwill [Line Items]              
Goodwill impairment charge         $ 493.9