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Share-Based Compensation - Summary 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 Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | $ 54.8 |  | $ 69.2 |  | $ 70.2 |
Impact of accelerated vesting on equity awards |  | $ 0.0 | $ 6.8 | $ 4.7 |  | $ 7.3 |  | 7.7 | [1] | 4.2 | [1] | 0.0 | [1]
Total share-based compensation expense |  | 14.3 | 12.7 | 31.4 |  | 34.2 |  | 62.5 |  | 73.4 |  | 70.2 |
Tax impact |  |  |  |  |  |  |  | (15.1) |  | (17.8) |  | (16.7) |
Reduction in net income |  |  |  |  |  |  |  | 47.4 |  | 55.6 |  | 53.5 |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense |  | 0.2 | 0.4 | 0.6 |  | 1.4 |  |  |  |  |  |  |
Share appreciation rights |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense |  | $ 0.2 | $ 0.1 | 0.5 |  | 0.2 |  |  |  |  |  |  |
Reportable Subsegments |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 39.8 |  | 42.5 |  | 50.6 |
Reportable Subsegments | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 1.7 |  | 2.3 |  | 9.6 |
Reportable Subsegments | Restricted share units and other share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 37.7 |  | 39.3 |  | 38.6 |
Reportable Subsegments | Share appreciation rights |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 0.4 |  | 0.9 |  | 2.4 |
Corporate Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 15.0 |  | 26.7 |  | 19.6 |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  | 13.4 |  | 19.4 |  | 23.2 |  | 25.7 |  | 28.0 |
Impact of accelerated vesting on equity awards | [1] |  |  | 0.3 | [2] | 0.9 | [2] | 1.4 |  | 0.0 |  | 0.0 |
Total share-based compensation expense |  |  |  | 13.7 | [3] | 20.3 | [3] | 24.6 |  | 25.7 |  | 28.0 |
Tax impact |  |  |  |  |  |  |  | (5.9) |  | (6.2) |  | (6.7) |
Reduction in net income |  |  |  |  |  |  |  | 18.7 |  | 19.5 |  | 21.3 |
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 17.6 |  | 16.0 |  | 20.2 |
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 0.0 |  | 0.4 |  | 2.2 |
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Restricted share units and other share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  | 12.7 |  | 14.9 |  | 17.6 |  | 15.7 |  | 16.9 |
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Share appreciation rights |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  |  |  |  |  | 0.0 |  | (0.1) |  | 1.1 |
Starz Business of Lions Gate Entertainment Corp | Corporate Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Expense: |  |  |  | $ 0.7 |  | $ 4.5 |  | $ 5.6 |  | $ 9.7 |  | $ 7.8 |
[1] | 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.
[2] | Represents the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements.
[3] | 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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