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Merger and Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
May 29, 2018 | Oct. 11, 2017 | Dec. 08, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 2,833.5 | $ 2,740.8 | $ 2,700.5
Interest rate, percentage spread on federal reserve discount rate |  |  |  |  |  | 5.00% |
Principal amount of debt outstanding |  |  |  |  | $ 2,927.5 | $ 2,520.0 |
Class A Voting Common Shares |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common shares, no par value |  |  |  |  | $ 0 | $ 0 |
Class B Non-Voting Common Shares |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common shares, no par value |  |  |  |  | $ 0 | $ 0 |
3 Arts Entertainment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity interests acquired |  | 51.00% |  |  |  |  |
Aggregate purchase price |  | $ 166.6 |  |  |  |  |
Percentage of cash consideration |  | 50.00% |  |  |  |  |
Period for issuance of equity interests after closing date |  | 1 year |  |  |  |  |
Period for weighted average closing price |  | 20 days |  |  |  |  |
Deferred Compensation Plan Assets |  |  |  |  | $ 38.3 |  |
Contingency period |  |  |  |  | 5 years |  |
Noncontrolling interest, fair value |  | $ 15.8 |  |  |  |  |
Intangible assets |  | 47.0 |  |  |  |  |
Goodwill |  | 92.7 |  |  |  |  |
Business acquisition, transaction costs |  | $ 1.3 |  |  |  |  |
3 Arts Entertainment | Class B Non-Voting Common Shares |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage at closing |  | 32.50% |  |  |  |  |
Percentage to be paid one-year from closing |  | 17.50% |  |  |  |  |
Starz |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 2,071.0 |  |  |
Goodwill |  |  |  | 2,177.0 |  |  |
Purchase price, cash consideration |  |  |  | 1,176.1 |  |  |
Starz | Acquisition-related Costs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Merger-related transaction costs |  |  |  |  |  |  | $ 70.9
Starz | Starz Series A Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, cash consideration |  |  |  | 1,123.3 |  |  |
Starz | Starz Series B Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, cash consideration |  |  |  | $ 52.8 |  |  |
Starz | Class A Voting Common Shares | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Conversion of stock, shares issued (in shares) |  |  |  | 0.5 |  |  |
Starz | Class B Non-Voting Common Shares | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Conversion of stock, shares issued (in shares) |  |  |  | 0.5 |  |  |
Good Universe |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Period for issuance of equity interests after closing date |  |  | 1 year |  |  |  |
Goodwill |  |  | $ 29.0 |  |  |  |
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 |
Good Universe | Class B Non-Voting Common Shares |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) |  |  | 119,751 |  |  |  |
Customer relationships | 3 Arts Entertainment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted-average useful life |  |  |  |  | 12 years |  |
Customer relationships | Starz |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted-average useful life |  |  |  | 17 years |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding equity interests (in shares) |  |  |  | 22,500,000 |  |  |
Dissenting shareholders' liability |  |  |  |  |  | 869.3 |
Accrued merger consideration payable | [1] |  |  | $ 797.3 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  |  | $ 0.0 | $ 0.0 |
Revolving Credit Facility | Starz |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Outstanding obligations |  |  |  | 255.0 |  |  |
Starz Senior Notes | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  | $ 675.0 |  |  |
3 Arts Entertainment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders |  | 49.00% |  |  |  |  |
[1] | In connection with the Starz Merger, Starz received demands for appraisal from purported holders of approximately 22.5 million shares of Starz Series A common stock, and the Company recorded a dissenting shareholders' liability at the time of acquisition for the value of the original merger consideration attributable to the dissenting shareholders. As of March 31, 2018, the Company had not paid the merger consideration for the shares that had demanded appraisal but had recorded a liability of $869.3 million that was included in current dissenting shareholders' liability on the consolidated balance sheet for the estimated value of the merger consideration that would have been payable for such shares, plus interest accrued at the Federal Reserve discount rate plus 5%, compounded quarterly. In November 2018 a settlement agreement was reached and the dissenting shareholders' liability was paid. See Note 17 for further information.

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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