Debt - Schedule of Future Annual Contractual Principal Payments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
2026	$ 215.6
2027	448.4
2028	134.0
2029	134.0
2030	765.8
Thereafter	0.0
Total corporate debt	1,697.8	$ 1,793.5
Less aggregate unamortized debt issuance costs	(24.8)	(10.2)
Total debt, net	1,673.0	1,783.3
Intercompany Revolver(1) | Revolving Credit Facility
Debt Instrument [Line Items]
2026	81.6
2027	0.0
2028	0.0
2029	0.0
2030	0.0
Thereafter	0.0
Total corporate debt	81.6	0.0
LGTV Revolver | Revolving Credit Facility
Debt Instrument [Line Items]
2026	0.0
2027	0.0
2028	0.0
2029	0.0
2030	0.0
Thereafter	0.0
Total corporate debt	0.0	$ 575.0
LGTV Term Loan A | Revolving Credit Facility
Debt Instrument [Line Items]
2026	0.0
2027	314.4
2028	0.0
2029	0.0
2030	0.0
Thereafter	0.0
Total corporate debt	314.4
eOne IP Credit Facility | Line of Credit
Debt Instrument [Line Items]
2026	34.0
2027	34.0
2028	34.0
2029	34.0
2030	187.0
Thereafter	0.0
Total corporate debt	323.0
LG IP Credit Facility | Line of Credit
Debt Instrument [Line Items]
2026	100.0
2027	100.0
2028	100.0
2029	100.0
2030	578.8
Thereafter	0.0
Total corporate debt	$ 978.8