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Net Income (Loss) Per Share (Diluted) (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
Effect of dilutive securities:
Share purchase options (in shares)	0.3	0.0	0.0	0.0
Restricted share units and restricted stock (in shares)	0.2	0.0	0.0	0.0
Contingently issuable shares	1.8	0.0	0.0	0.0
Adjusted weighted average common shares outstanding	219.8	213.6	216.8	212.7
Diluted net income (loss) per common share (in usd per share)	$ 0.01	$ (0.67)	$ (0.24)	$ (0.71)

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