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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 |  |

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