Fair Value Measurements - Assets and Liabilities Required to Be Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Lions Gate Entertainment Corp.
Liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Fair Value, Measurements, Recurring
Assets:
Forward exchange contracts (see Note 19)	$ 1.8	$ 0.0
Interest rate swaps	0.0	35.6
Liabilities:
Forward exchange contracts (see Note 19)	0.0	(2.8)
Interest rate swaps (see Note 19)	3.1	0.0
Fair Value, Measurements, Recurring | Lions Gate Entertainment Corp.
Assets:
Forward exchange contracts (see Note 19)	1.8	0.0
Interest rate swaps	0.0	35.6
Liabilities:
Forward exchange contracts (see Note 19)	0.0	(2.8)
Interest rate swaps (see Note 19)	3.1	0.0
Level 1 | Fair Value, Measurements, Recurring
Assets:
Forward exchange contracts (see Note 19)	0.0	0.0
Interest rate swaps	0.0	0.0
Liabilities:
Forward exchange contracts (see Note 19)	0.0	0.0
Interest rate swaps (see Note 19)	0.0	0.0
Level 1 | Fair Value, Measurements, Recurring | Lions Gate Entertainment Corp.
Assets:
Forward exchange contracts (see Note 19)	0.0	0.0
Interest rate swaps	0.0	0.0
Liabilities:
Forward exchange contracts (see Note 19)	0.0	0.0
Interest rate swaps (see Note 19)	0.0	0.0
Level 2 | Fair Value, Measurements, Recurring
Assets:
Forward exchange contracts (see Note 19)	1.8	0.0
Interest rate swaps	0.0	35.6
Liabilities:
Forward exchange contracts (see Note 19)	0.0	(2.8)
Interest rate swaps (see Note 19)	3.1	0.0
Level 2 | Fair Value, Measurements, Recurring | Lions Gate Entertainment Corp.
Assets:
Forward exchange contracts (see Note 19)	1.8	0.0
Interest rate swaps	0.0	35.6
Liabilities:
Forward exchange contracts (see Note 19)	0.0	(2.8)
Interest rate swaps (see Note 19)	$ 3.1	$ 0.0