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Description of Business, Basis of Presentation and Significant Accounting Policies (Basic Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ (44.9)	$ (91.2)	$ 1.8	$ (54.0)	$ (155.2)	$ 22.9	$ (144.1)	$ (7.9)	$ (188.4)	$ (284.2)	$ 473.6
Denominator:
Weighted average common shares outstanding (in shares)									217.9	213.7	208.4
Basic net income (loss) per common share (in usd per share)	$ (0.20)	$ (0.42)	$ 0.01	$ (0.25)	$ (0.72)	$ 0.11	$ (0.67)	$ (0.04)	$ (0.86)	$ (1.33)	$ 2.27

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