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Segment Information - Schedule of Adjusted Depreciation and Amortization (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Allocated share based compensation expenses | $ 14.3 | $ 12.7 | $ 31.4 |  | $ 34.2 |  | $ 62.5 | $ 73.4 | $ 70.2
Share-based compensation |  |  | 46.9 |  | 53.6 |  | 62.5 | 73.4 | 70.2
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Allocated share based compensation expenses |  |  | 13.7 | [1] | 20.3 | [1] | 24.6 | 25.7 | 28.0
Share-based compensation |  |  | 13.7 |  | 20.3 |  | 24.6 | 25.7 | 28.0
Starz Business of Lions Gate Entertainment Corp | Lions Gate Corporate Employee Share Based Compensation |  |  |  |  |  |  |  |  |
Allocated share based compensation expenses |  |  |  |  |  |  | $ 5.6 | $ 9.7 | $ 7.8
Share-based compensation |  |  | $ 0.7 |  | $ 4.5 |  |  |  |
[1] | Included in net earnings (loss) from discontinued operations for the nine months ended December 31, 2024 was share-based compensation expense of $0.3 million (2023 — $1.4 million).

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