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Share-Based Compensation - Summary Of Share-Based Compensation Expense (Parenthetical) (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] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense, after Tax |  |  |  |  |  |  |  | $ 47.4 |  | $ 55.6 |  | $ 53.5 |
Share-Based Payment Arrangement, Accelerated Cost |  | $ 0.0 | $ 6.8 | $ 4.7 |  | $ 7.3 |  | 7.7 | [1] | 4.2 | [1] | 0.0 | [1]
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense, after Tax |  |  |  |  |  |  |  | 18.7 |  | 19.5 |  | 21.3 |
Share-Based Payment Arrangement, Accelerated Cost | [1] |  |  | 0.3 | [2] | 0.9 | [2] | 1.4 |  | 0.0 |  | 0.0 |
Starz Business of Lions Gate Entertainment Corp | Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense, after Tax |  |  |  | $ 0.3 |  | $ 1.4 |  | 1.8 |  | $ 3.0 |  | $ 1.9 |
Share-Based Payment Arrangement, Accelerated Cost |  |  |  |  |  |  |  | $ 0.4 |  |  |  |  |
[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.

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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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- Details
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