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Net Income (Loss) Per Share (Basic) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ (7.9)	$ 173.8
Denominator:
Weighted average common shares outstanding (in shares)	211.8	206.8
Basic net income (loss) per common share (in usd per share)	$ (0.04)	$ 0.84

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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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