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Net Income (Loss) Per Share (Basic) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Numerator: |  |  |  |
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders | $ 22.9 | $ 193.0 | $ (129.0) | $ 382.3
Denominator: |  |  |  |
Weighted average common shares outstanding (in shares) | 214.2 | 208.8 | 213.2 | 207.8
Basic net income (loss) per common share (in usd per share) | $ 0.11 | $ 0.92 | $ (0.61) | $ 1.84

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