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Description of Business, Basis of Presentation and Significant Accounting Policies (Basic Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Lions Gate Entertainment Corp. shareholders | $ 91.3 | $ 193.0 | $ 15.5 | $ 173.8 | $ 61.6 | $ (30.6) | $ (17.5) | $ 1.3 | $ 473.6 | $ 14.8 | $ 50.2
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 208.4 | 165.0 | 148.5
Basic net income per common share (in usd per share) | $ 0.43 | $ 0.92 | $ 0.07 | $ 0.84 | $ 0.30 | $ (0.19) | $ (0.12) | $ 0.01 | $ 2.27 | $ 0.09 | $ 0.34

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