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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

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