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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions | Dec. 31, 2017 | Mar. 31, 2017
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Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 48.0 | 50.8
Stock Options and Equity-Settled SARs |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 33.3 | 33.4
Restricted Stock and Restricted Share Units - Unvested |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.6 | 2.7
Convertible Senior Subordinated Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Coupon rate | 1.25% |
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.1 | 2.1
April 2013 Notes | Convertible Senior Subordinated Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Coupon rate | 1.25% |
Lionsgate Plan | Common shares available for future issuance under plan |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 10.0 | 0.8
Starz Plan | Common shares available for future issuance under plan |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 0.0 | 11.8

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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