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Net Income (Loss) Per Share (Basic) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator: |  |  |  |
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders | $ (144.1) | $ 15.5 | $ (151.9) | $ 189.3
Denominator: |  |  |  |
Weighted average common shares outstanding (in shares) | 213.6 | 207.8 | 212.7 | 207.3
Basic net income (loss) per common share (in usd per share) | $ (0.67) | $ 0.07 | $ (0.71) | $ 0.91

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