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Capital Stock - Schedule of Share-Based Compensation Expense (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
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | $ 14.3 | $ 12.7 | $ 31.4 | $ 34.2 | $ 62.5 |  | $ 73.4 |  | $ 70.2 |
Corporate allocation of share-based compensation | 0.0 | 4.5 | 10.8 | 12.1 |  |  |  |  |  |
Share-based payment arrangement, total | 14.3 | 17.2 | 42.2 | 46.3 | 54.8 | [1] | 69.2 | [1] | 70.2 | [1]
Impact of accelerated vesting on equity awards | 0.0 | 6.8 | 4.7 | 7.3 | $ 7.7 | [2] | $ 4.2 | [2] | $ 0.0 | [2]
Total share-based compensation expense | 14.3 | 24.0 | 46.9 | 53.6 |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | 0.2 | 0.4 | 0.6 | 1.4 |  |  |  |  |  |
Restricted share units and other share-based compensation |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | 13.9 | 12.2 | 30.3 | 32.6 |  |  |  |  |  |
Share appreciation rights |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | $ 0.2 | $ 0.1 | $ 0.5 | $ 0.2 |  |  |  |  |  |
[1] | The following table reconciles total share-based compensation expense to adjusted share-based compensation expense:
[2] | Represents share-based compensation expense included in restructuring and other expenses reflecting the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors, certain consultants qualifying for treatment as employees, including the impact of compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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