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Mergers and Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 11, 2017 | Dec. 08, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 11, 2017 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Accrued merger consideration payable |  |  | $ 854.5 | $ 854.5 |  | $ 812.9
Interest Rate, Percentage Spread on Federal Reserve Discount Rate |  |  | 5.00% | 5.00% |  |
Goodwill |  |  | $ 2,740.8 | $ 2,740.8 |  | $ 2,700.5
Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 2,177.0 |  |  |  |
Purchase price, cash consideration |  | $ 1,176.1 |  |  |  |
Good Universe |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 29.0 |
Period for issuance of equity interests after closing date | 1 year |  |  |  |  |
Purchase price, cash consideration | $ 20.4 |  |  |  |  |
Purchase price, cash consideration to be paid after one-year of the closing date | 1.4 |  |  |  |  |
Purchase price, loans assumed | $ 23.6 |  |  |  |  |
Repayments of corporate debt and production loans |  |  | $ 14.9 |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Outstanding equity interests (in shares) |  | 25,000,000 |  |  |  |
Period for demanding appraisal rights |  |  |  | 60 days |  |
Shareholders withdrawing demands of appraisal rights (in shares) |  |  | 2,510,485 | 2,510,485 |  |
Accrued merger consideration payable |  | $ 797.3 | $ 854.5 | $ 854.5 |  |
Class B Non-Voting Shares | Good Universe |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, common shares to be issued, number of shares | 119,751 |  |  |  |  |

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- Definition Days after the effective date of a merger, in which any shareholder who has not commenced an appraisal proceeding or joined the proceeding as a named party shall have the right to withdraw such stockholder's demand for appraisal and to accept the terms offered upon the merger. + References No definition available. + Details
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