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Additional Financial Information - Schdule of Receivables Transferred Under Individual Agreements or Purchases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Carrying value of receivables transferred and derecognized |  |  |  |  | $ 512.3 | $ 400.5 | $ 285.0
Net cash proceeds received |  |  |  |  | 491.9 | 383.0 | 278.3
Loss recorded related to transfers of receivables |  |  |  |  | 20.4 | 17.5 | 6.7
Individual Monetization Agreements | Trade Accounts Receivable |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Carrying value of receivables transferred and derecognized | $ 51.7 | $ 85.3 | $ 345.5 | $ 385.8 |  |  |
Net cash proceeds received | 50.0 | 81.8 | 335.7 | 370.7 |  |  |
Loss recorded related to transfers of receivables | $ 1.7 | $ 3.5 | 9.8 | 15.1 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Carrying value of receivables transferred and derecognized |  |  | 617.8 | 766.3 | 987.1 | 1,190.1 | 1,288.5
Net cash proceeds received from Lionsgate |  |  | 0.0 | 85.6 | 85.5 | 183.7 | 172.9
Loss recorded related to transfers of receivables |  |  | 5.5 | 5.8 | 7.5 | 6.7 | 2.7
Starz Business of Lions Gate Entertainment Corp | Individual Monetization Agreements |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Net cash proceeds received |  |  | $ 612.3 | $ 674.9 | $ 894.0 | $ 999.7 | $ 1,112.9

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