Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income (loss) attributable to Lionsgate Studios Corp. shareholders	$ 6.4	$ (41.1)	$ (150.4)	$ (46.5)
Accretion of redeemable noncontrolling interest	(0.3)	0.0	(1.0)	0.0
Net income (loss) attributable to Lionsgate Studios Corp. shareholders after accretion of redeemable noncontrolling interest, basic	6.1	(41.1)	(151.4)	(46.5)
Net income (loss) attributable to Lionsgate Studios Corp. shareholders after accretion of redeemable noncontrolling interest, diluted	$ 6.1	$ (41.1)	$ (151.4)	$ (46.5)
Denominator:
Weighted average common shares outstanding, basic (in shares)	288.7	253.4	283.3	253.4
Weighted average common shares outstanding, diluted (in shares)	288.7	253.4	283.3	253.4
Basic net income (loss) per common share (in dollars per share)	$ 0.02	$ (0.16)	$ (0.53)	$ (0.18)
Diluted net income (loss) per common share (in dollars per share)	$ 0.02	$ (0.16)	$ (0.53)	$ (0.18)