Additional Financial Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (1,150.2)	$ (778.9)	$ (259.5)
Other comprehensive income (loss)	(4.1)	29.5	80.6
Reclassifications to net loss	31.7	34.3	(10.7)
Ending balance	(1,016.6)	(1,150.2)	(778.9)
Income tax expense (benefit) reflected in other comprehensive income	0.0	0.0
Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(310.5)	786.0	2,683.4
Ending balance	(352.7)	(310.5)	786.0
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(42.1)	(41.1)	(38.9)
Other comprehensive income (loss)	(6.9)	(1.0)	(2.2)
Reclassifications to net loss	0.0	0.0	0.0
Ending balance	(49.0)	(42.1)	(41.1)
Foreign currency translation adjustments | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(22.7)	(21.6)	(19.7)
Other comprehensive income (loss)	(5.4)	(1.1)	(1.9)
Reclassifications to net loss	5.3
Ending balance	(22.8)	(22.7)	(21.6)
Foreign currency translation adjustments | Operating Income (Loss) | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassifications to net loss	0.0	0.0	0.0
Net unrealized gain (loss) on cash flow hedges | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	138.7	142.5	49.0
Other comprehensive income (loss)	5.0	30.5	82.8
Reclassifications to net loss	(16.6)
Ending balance	95.4	138.7	142.5
Net unrealized gain (loss) on cash flow hedges | Operating Income (Loss) | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassifications to net loss	(31.7)	(34.3)	10.7
Net unrealized gain (loss) on cash flow hedges | Direct Operating Expense | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassifications to net loss	1.2	0.3	0.3
Net unrealized gain (loss) on cash flow hedges | Interest Expense | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassifications to net loss	(32.9)	(34.6)	10.4
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	96.7	101.5	10.2
Ending balance	60.9	96.7	101.5
Accumulated other comprehensive income (loss) | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	116.0	120.9	29.3
Other comprehensive income (loss)	(0.4)	29.4	80.9
Reclassifications to net loss	(11.3)
Ending balance	72.6	116.0	120.9
Accumulated other comprehensive income (loss) | Operating Income (Loss) | Lions Gate Entertainment Corp.
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassifications to net loss	$ (31.7)	$ (34.3)	$ 10.7