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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, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |  |
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders | $ (91.2) | $ 22.9 | $ (143.4) | $ (129.0)
Denominator: |  |  |  |
Weighted average common shares outstanding (in shares) | 218.0 | 214.2 | 217.2 | 213.2
Basic net income (loss) per common share (in usd per share) | $ (0.42) | $ 0.11 | $ (0.66) | $ (0.61)

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