Additional Financial Information - Schedule of Receivables Transferred Under Individual Agreements or Purchases (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss recorded related to transfers of receivables	$ 7.1	$ 7.5	$ 6.7
Nonrelated Party
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net cash proceeds received from third party purchasers and Old Lionsgate	815.1	894.0	999.7
Related Party
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net cash proceeds received from third party purchasers and Old Lionsgate	0.0	85.5	183.7
Individual Monetization Agreements \| Trade Accounts Receivable
Accumulated Other Comprehensive Income (Loss) [Line Items]
Carrying value of receivables transferred and derecognized	$ 822.2	$ 987.1	$ 1,190.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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