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Additional Financial Information - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Cash Flow Supplemental Disclosures Related To Leases [Line Items] |  |  |
Operating cash flows for operating leases | $ 45.1 | $ 40.3 | $ 44.9
Operating leases | 172.1 | 11.3 | 51.1
Operating leases—increase in right-of-use assets | 103.6 | 17.4 | 30.9
Operating leases—increase in lease liability | 103.6 | 17.4 | 30.9
Starz Business of Lions Gate Entertainment Corp |  |  |
Cash Flow Supplemental Disclosures Related To Leases [Line Items] |  |  |
Operating cash flows for operating leases | 10.4 | 2.0 | 12.1
Operating leases | 0.0 | 0.0 | 16.7
Operating leases—increase in right-of-use assets | 0.0 | 15.6 | (3.4)
Operating leases—increase in lease liability | $ 0.0 | $ 15.6 | $ (3.4)

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