Noncontrolling Interests - Changes In Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 123.3	$ 343.6	$ 321.2
Net loss attributable to redeemable noncontrolling interests	(1.7)	(14.9)	(9.2)
Noncontrolling interests discount accretion	0.0	0.0	13.2
Recovery (accretion) of redeemable noncontrolling interest	(5.0)	83.4	78.4
Other	0.0	(93.2)	1.7
Purchase of noncontrolling interest	(23.4)	(194.6)	(55.1)
Ending balance	93.7	123.3	343.6
Lions Gate Entertainment Corp.
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	123.3	343.6	321.2
Net loss attributable to redeemable noncontrolling interests	(1.7)	(14.9)	(9.2)
Noncontrolling interests discount accretion	0.0	0.0	13.2
Recovery (accretion) of redeemable noncontrolling interest	(5.0)	83.4	78.4
Other	0.0	(93.2)	1.7
Cash contributions (distributions)	0.5	(1.0)	(6.6)
Purchase of noncontrolling interest	(23.4)	(194.6)	(55.1)
Ending balance	$ 93.7	$ 123.3	$ 343.6