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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 30 Months Ended | 84 Months Ended | 108 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 11, 2017 | May 11, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2010 | Sep. 30, 2017 | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee |  |  |  |  | $ 29.3 | $ 5.4 |  |  |
Proceeds from the sale of equity method investees |  |  |  |  | 393.7 | 0.0 |  |  |
Gain on sale of equity interest in EPIX |  |  | $ 0.0 | $ 0.0 | $ 201.0 | $ 0.0 |  |  |
EPIX |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee |  |  |  |  |  |  | $ 80.4 | $ 0.0 |
Equity method investment distributions received |  |  |  |  |  |  |  |  | $ 42.0
Equity method investment, ownership percentage | 31.15% | 31.15% |  | 31.15% |  | 31.15% |  |  |
Pop |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage after call option, partner in equity method investment |  |  | 80.00% |  | 80.00% |  |  | 80.00% |
Call option, period exercisable beginning March 26, 2018 |  |  |  |  | 30 days |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% |  | 50.00% |  |  | 50.00% |
Defy Media |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Effective economic interest in Defy Media |  |  | 11.00% |  | 11.00% |  |  | 11.00% |
Roadside Attractions |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 43.00% |  | 43.00% |  |  | 43.00% |
Pantelion Films |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% |  | 49.00% |  |  | 49.00% |
Atom Tickets |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 17.00% |  | 17.00% |  |  | 17.00% |
Playco |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 41.30% |  | 41.30% |  |  | 41.30% |
Redeemable Preferred Stock | Pop |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Rate of dividend on preferred stock |  |  |  |  | 10.00% |  |  |  |
Total accretion period to redemption date of mandatorily redeemable preferred stock units and dividend |  |  |  |  | 10 years |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest sold | 100.00% |  |  |  |  |  |  |  |
Proceeds from the sale of equity method investees | $ 397.2 |  |  |  |  |  |  |  |
Gain on sale of equity interest in EPIX |  |  |  |  | $ 201.0 |  |  |  |
Lions Gate | Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest sold | 31.15% |  |  |  |  |  |  |  |
Proceeds from the sale of equity method investees | $ 373.8 |  |  |  |  |  |  |  |
Distribution from equity method investee |  | $ 23.4 |  |  |  |  |  |  |

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