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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ 1.8	$ (144.1)	$ (52.2)	$ (151.9)
Denominator:
Weighted average common shares outstanding (in shares)	217.5	213.6	216.8	212.7
Basic net income (loss) per common share (in usd per share)	$ 0.01	$ (0.67)	$ (0.24)	$ (0.71)

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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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