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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
May 11, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in equity method investee |  | $ 2.8 | $ 9.5
Pop |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage |  | 50.00% | 50.00%
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 | 31.15% |  |
Gain (loss) on investments |  |  | $ 201.0
Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage |  | 9.00% |
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage |  | 50.00% |

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