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Acquisitions and Dispositions (Narrative) (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 15, 2021 USD ($) title | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($)
Asset Acquisition [Line Items] |  |  |
Cash consideration |  | $ 123.6 | $ 0.0
Spyglass Library |  |  |
Asset Acquisition [Line Items] |  |  |
Number of titles acquired | title | 200 |  |
Spyglass |  |  |
Asset Acquisition [Line Items] |  |  |
Equity method investment, ownership percentage | 18.90% |  |
Spyglass | Spyglass Library |  |  |
Asset Acquisition [Line Items] |  |  |
Purchase price of asset acquisition and preferred equity interest | $ 191.4 |  |
Cash paid at closing for assets acquisition and preferred equity interest | 171.4 |  |
Asset acquisition and preferred equity interest, deferred purchase consideration payable | $ 20.0 |  |
Asset acquisition and preferred equity interest, period to pay deferred purchase consideration payable | 2 years |  |
Disposal Group, Not Discontinued Operations | Pantaya |  |  |
Asset Acquisition [Line Items] |  |  |
Equity interest sold |  | 75.00% |
Cash consideration |  | $ 123.6 |
Gain on sale of Pantaya |  | (44.1) |
Goodwill allocated related to sale of Pantaya |  | $ 69.0 |

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