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Commitments and Contingencies (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 30, 2016 | Mar. 16, 2017 plaintiff | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |
Dissenting shareholders' liability |  |  | $ 869.3 | $ 0.0 |  |
Redeemable noncontrolling interest |  |  | 101.8 | 93.8 | $ 90.5 | $ 0.0
Operating leases, rental expense |  |  | $ 20.7 | 15.6 | 14.2 |
Multiemployer benefit plans, funded status |  |  | At least 80 percent |  |  |
Multiemployer benefit plans, period contributions |  |  | $ 70.9 | $ 59.4 | $ 60.0 |
Contingencies, putative class action complaints filed, number | 7 |  |  |  |  |
Petitions for appraisal filed | plaintiff |  | 5 |  |  |  |
Starz | Starz Dissenting Shareholders |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Dissenting shareholders' liability |  |  | $ 869.3 |  |  |
Motion Picture Industry Pension Plan |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Multiemployer benefit plans, funded percentage |  |  | 67.40% |  |  |
Screen Actors Guild - Producers Pension Plan |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Multiemployer benefit plans, funded percentage |  |  | 78.15% |  |  |

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