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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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