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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, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ (155.2)	$ 22.9	$ (144.1)	$ (7.9)	$ 91.3	$ 193.0	$ 15.5	$ 173.8	$ (284.2)	$ 473.6	$ 14.8
Denominator:
Weighted average common shares outstanding (in shares)									213.7	208.4	165.0
Basic net income (loss) per common share (in usd per share)	$ (0.72)	$ 0.11	$ (0.67)	$ (0.04)	$ 0.43	$ 0.92	$ 0.07	$ 0.84	$ (1.33)	$ 2.27	$ 0.09

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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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