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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, 2020	Jun. 30, 2019
Numerator:
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ 51.1	$ (54.0)
Denominator:
Weighted average common shares outstanding (in shares)	219.5	216.1
Basic net income (loss) per common share (in usd per share)	$ 0.23	$ (0.25)

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