Restructuring and Other - Severance Liability Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Restructuring and Other Severance Liability
Amount included in restructuring and other	$ 4.9	$ 7.7	$ 4.2
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed	Accruals(2)	Accruals(2)	Accruals(2)
Lions Gate Entertainment Corp.
Restructuring and Other Severance Liability
Amount included in restructuring and other	$ 5.4	$ 9.4	$ 4.2
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed	Accruals(2)	Accruals(2)	Accruals(2)
Severance liability
Restructuring and Other Severance Liability
Beginning balance	$ 19.3	$ 3.7	$ 0.8
Accruals	32.1	27.5	10.8
Severance payments	(27.9)	(11.9)	(7.9)
Ending balance	23.5	19.3	3.7
Remaining severance liability, expected to be paid in next 12 months	23.5
Severance liability | Lions Gate Entertainment Corp.
Restructuring and Other Severance Liability
Beginning balance	23.6	8.7	1.5
Accruals	35.2	37.2	18.0
Severance payments	(33.6)	(22.3)	(10.8)
Ending balance	25.2	$ 23.6	$ 8.7
Severance liability | Other Current Liabilities | Lions Gate Entertainment Corp.
Restructuring and Other Severance Liability
Remaining severance liability, expected to be paid in next 12 months	$ 25.2