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Segment Information - Schedule of Adjusted Share-Based Compensation (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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense | [1] |  |  |  |  |  |  | $ 62.5 |  | $ 73.4 |  | $ 70.2 |
Amount included in restructuring and other |  | $ 0.0 | $ (6.8) | $ (4.7) |  | $ (7.3) |  | (7.7) | [2] | (4.2) | [2] | 0.0 | [2]
Adjusted share-based compensation |  |  |  |  |  |  |  | 54.8 |  | 69.2 |  | 70.2 |
Total share-based compensation expense |  | 14.3 | 24.0 | 46.9 |  | 53.6 |  |  |  |  |  |  |
Adjusted share-based compensation |  | 14.3 | 17.2 | 42.2 |  | 46.3 |  | 54.8 | [3] | 69.2 | [3] | 70.2 | [3]
Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense |  | 0.0 | 6.8 | 4.7 |  | 7.3 |  |  |  |  |  |  |
Corporate and Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted share-based compensation |  | 14.3 | 17.2 | 42.2 |  | 46.3 |  |  |  |  |  |  |
Corporate and Reconciling Items | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount included in restructuring and other |  | $ 0.0 | $ (6.8) | (4.7) |  | (7.3) |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense |  |  |  | 13.7 |  | 20.3 |  | 24.6 |  | 25.7 |  | 28.0 |
Amount included in restructuring and other | [2] |  |  | (0.3) | [4] | (0.9) | [4] | (1.4) |  | 0.0 |  | 0.0 |
Adjusted share-based compensation |  |  |  | 13.4 |  | 19.4 |  | 23.2 |  | 25.7 |  | 28.0 |
Adjusted share-based compensation |  |  |  | $ 13.4 |  | $ 19.4 |  | $ 23.2 |  | $ 25.7 |  | $ 28.0 |
[1] | Total share-based compensation expense in the years ended March 31, 2024, 2023 and 2022 includes $15.0 million, $26.7 million and $19.6 million, respectively, of corporate allocation of share-based compensation expense, representing the allocation of Lionsgate’s corporate employee 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.
[3] | The following table reconciles total share-based compensation expense to adjusted share-based compensation expense:
[4] | Represents 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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