Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Total corporate debt	$ 1,697.8	$ 1,793.5
Unamortized debt issuance costs	(24.8)	(10.2)
Total debt, net	1,673.0	1,783.3
Less current portion	(215.6)	(860.3)
Non-current portion of debt	1,457.4	923.0
Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	2,331.2	2,508.5
Unamortized debt issuance costs	(40.0)	(28.5)
Total debt, net	2,291.2	2,480.0
Less current portion	(134.0)	(860.3)
Non-current portion of debt	2,157.2	1,619.7
Revolving Credit Facility | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	0.0	575.0
Term Loan A | Term Loans | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	314.4	399.3
Term Loan B | Term Loans | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	0.0	819.2
5.5% Senior Notes and Exchange Notes(2) | Senior Notes | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	$ 715.0	715.0
Coupon rate (as percent)	5.50%
eOne IP Credit Facility | Line of Credit
Debt Instrument [Line Items]
Total corporate debt	$ 323.0
eOne IP Credit Facility | Line of Credit | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	323.0	0.0
LG IP Credit Facility | Line of Credit
Debt Instrument [Line Items]
Total corporate debt	978.8
LG IP Credit Facility | Line of Credit | Lions Gate Entertainment Corp.
Debt Instrument [Line Items]
Total corporate debt	$ 978.8	$ 0.0