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Description of Business, Basis of Presentation and Significant Accounting Policies (Other) (Details)
$ / shares in Units, title in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2024
USD ($)
title
$ / shares
Mar. 31, 2023
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
$ / shares
Goodwill [Line Items]          
Goodwill     $ 811.2 $ 1,289.5 $ 2,764.5
Goodwill, impairment loss $ 493.9 $ 1,475.0 493.9 1,475.0  
Indefinite-lived intangible assets (excluding goodwill)     0.0    
Impairment of Starz trade name intangible asset $ 170.0        
Trade names intangible asset, estimated useful life 10 years        
Amortization     $ 192.2 $ 180.3 $ 177.9
Decrease to basic net loss per share (in dollars per share) | $ / shares     $ 4.77 $ 8.82 $ 0.84
Decrease to diluted net loss per share (in dollars per share) | $ / shares     $ 4.77 $ 8.82 $ 0.84
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]     Goodwill and intangible asset impairment    
Number of titles in library | title     20    
Advertising expenses     $ 692.6 $ 610.7 $ 662.4
Timing of payment     60 days    
Intangible Assets, Amortization Period          
Goodwill [Line Items]          
Amortization     $ 4.0    
Decrease to basic net loss per share (in dollars per share) | $ / shares     $ (0.02)    
Decrease to diluted net loss per share (in dollars per share) | $ / shares     $ (0.02)