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Contingencies (Narrative) (Details) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 30, 2016 | Mar. 16, 2017 plaintiff | Jun. 30, 2018 USD ($) shares | Mar. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Dissenting shareholders' liability |  |  | $ 885.2 | $ 869.3
Interest Rate, Percentage Spread on Federal Reserve Discount Rate |  |  | 5.00% |
Contingencies, putative class action complaints filed, number | 7 |  |  |
Petitions for appraisal filed | plaintiff |  | 5 |  |
Starz Dissenting Shareholders | Starz |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Outstanding equity interests (in shares) | shares |  |  | 22.5 |
Dissenting shareholders' liability |  |  | $ 885.2 |

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