Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 5.3	$ 0.3	$ 1.0
Increases related to current year tax position	0.0	0.0	0.0
Increases related to prior year tax positions	5.6	5.3	0.0
Decreases related to prior year tax positions	(2.0)	0.0	0.0
Settlements	0.0	0.0	0.0
Lapse in statute of limitations	(0.8)	(0.3)	(0.7)
Unrecognized tax benefits, ending balance	8.1	5.3	0.3
Lions Gate Entertainment Corp.
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	12.1	64.9	70.2
Increases related to current year tax position	0.0	0.0	0.0
Increases related to prior year tax positions	2.0	8.9	0.2
Decreases related to prior year tax positions	(2.0)	0.0	0.0
Settlements	(2.6)	(60.7)	(4.3)
Lapse in statute of limitations	(1.4)	(1.0)	(1.2)
Unrecognized tax benefits, ending balance	$ 8.1	$ 12.1	$ 64.9