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Restructuring and Other - Severance Liability Rollforward (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Beginning balance |  | $ 3.7 | $ 3.7 | $ 0.8 | $ 3.9
Accruals |  |  | 27.5 | 10.8 | 2.8
Severance payments |  |  | (11.9) | (7.9) | (5.9)
Ending Balance |  |  | 19.3 | 3.7 | 0.8
Severance liability |  |  |  |  |
Restructuring and Other Severance Liability |  |  |  |  |
Beginning balance | $ 19.3 | 3.7 | 3.7 |  |
Accruals | 19.9 | 24.3 |  |  |
Severance payments | (16.0) | (5.4) |  |  |
Ending balance | 23.2 | 22.6 | 19.3 | 3.7 |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Beginning balance | 1.6 | 2.2 | 2.2 | 0.7 | 1.8
Accruals | 1.4 | 4.5 | 5.4 | 4.2 | 1.8
Severance payments | (1.5) | (3.0) | (6.0) | (2.7) | (2.9)
Ending Balance | $ 1.5 | $ 3.7 | $ 1.6 | $ 2.2 | $ 0.7

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