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Capital Stock - Schedule of Share-Based Compensation Expense (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
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | $ 8.6 | $ 13.5 | $ 17.0 | $ 21.4 | $ 62.5 |  | $ 73.4 |  | $ 70.2 |
Corporate allocation of share-based compensation | 6.7 | 3.9 | 10.9 | 7.6 |  |  |  |  |  |
Share-based payment arrangement, total | 15.3 | 17.4 | 27.9 | 29.0 | 54.8 | [1] | 69.2 | [1] | 70.2 | [1]
Impact of accelerated vesting on equity awards | 4.6 | 0.0 | 4.6 | 0.5 | $ 7.7 | [2] | $ 4.2 | [2] | $ 0.0 | [2]
Total share-based compensation expense | 19.9 | 17.4 | 32.5 | 29.5 |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | 0.2 | 0.5 | 0.4 | 0.9 |  |  |  |  |  |
Restricted share units and other share-based compensation |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | 8.2 | 12.9 | 16.3 | 20.3 |  |  |  |  |  |
Share appreciation rights |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |  |  |  |  |  |
Total Lionsgate Studios employee share-based compensation expense | $ 0.2 | $ 0.1 | $ 0.3 | $ 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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