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Additional Financial Information - Schdule of Receivables Transferred Under Individual Agreements or Purchases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 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 | $ 186.4 | $ 196.2 | $ 293.8 | $ 300.5 |  |  |
Net cash proceeds received | 181.7 | 187.3 | 285.8 | 288.9 |  |  |
Loss recorded related to transfers of receivables | $ 4.7 | $ 8.9 | 8.0 | 11.6 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Carrying value of receivables transferred and derecognized |  |  | 411.5 | 545.7 | 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 |  |  | 3.7 | 4.1 | 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 |  |  | $ 407.8 | $ 456.0 | $ 894.0 | $ 999.7 | $ 1,112.9

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