Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 20.1	$ 191.1	$ (140.5)	$ 378.5
Foreign currency translation adjustments, net of tax	0.7	0.5	(7.2)	2.1
Net unrealized gain (loss) on available-for-sale securities, net of tax	0.0	(2.3)	0.0	0.8
Net unrealized loss on cash flow hedges, net of tax benefit of $10.2 million, $0.1 million, $8.9 million and $0.2 million	(29.5)	(0.3)	(24.9)	(0.5)
Comprehensive income (loss)	(8.7)	189.0	(172.6)	380.9
Less: Comprehensive loss attributable to noncontrolling interests	2.8	1.9	11.5	3.8
Comprehensive income (loss) attributable to Lions Gate Entertainment Corp. shareholders	$ (5.9)	$ 190.9	$ (161.1)	$ 384.7