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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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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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