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Investments (Available-for-sale Narrative) (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2016 | Mar. 27, 2015 | Jul. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Cost basis |  |  |  | $ 2.6 | $ 158.9 |
Gain recognized on Starz available-for-sale securities |  |  |  | 20.4 | $ 0.0 | $ 0.0
Next Games |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Payments to acquire cost method investments |  |  | $ 2.0 |  |  |
Starz |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Issuance of common shares related to investments (in shares) |  | 4,967,695 |  |  |  |
Starz Series A Common Stock | Starz |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Shares received in exchange (in shares) |  | 2,118,038 |  |  |  |
Starz Series B Common Stock | Starz |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Shares received in exchange (in shares) |  | 2,590,597 |  |  |  |
Starz |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value | $ 179.3 |  |  |  |  |
Cost basis | $ 158.9 |  |  |  |  |
Gain recognized on Starz available-for-sale securities |  |  |  | $ 20.4 |  |

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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