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Segment Information - Schedule of Reconciliation of Segment General and Administrative Expense to Consolidated (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, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment general and administrative expenses |  |  |  |  |  |  |  | $ 171.8 |  | $ 161.7 |  | $ 133.3 |
Corporate general and administrative expenses |  |  |  |  |  |  |  | 110.6 |  | 100.9 |  | 80.0 |
Share-based compensation expense included in general and administrative expense | [1] |  |  |  |  |  |  | 54.8 |  | 69.2 |  | 70.2 |
Purchase accounting and related adjustments | [2] |  |  |  |  |  |  | 12.0 |  | 55.2 |  | 59.2 |
Reconciles segment of general and administration |  |  |  |  |  |  |  | 349.2 |  | 387.0 |  | 342.7 |
General and administration |  | $ 82.4 | $ 86.0 | $ 259.4 |  | $ 261.6 |  | 349.2 |  | 387.0 |  | 342.7 |
Segment general and administrative expenses |  | 36.9 | 40.6 | 122.9 |  | 123.7 |  | 171.8 |  | 161.7 |  | 133.3 |
Corporate general and administrative expenses |  |  |  |  |  |  |  | 110.6 |  | 100.9 |  | 80.0 |
Purchase accounting and related adjustments | [3] |  |  |  |  |  |  | 17.1 |  | 61.6 |  | 65.3 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment general and administrative expenses |  | 36.9 | 40.6 | 122.9 |  | 123.7 |  |  |  |  |  |  |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate general and administrative expenses |  | 28.4 | 25.2 | 87.6 |  | 76.2 |  |  |  |  |  |  |
Corporate and Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting and related adjustments |  | 3.8 | 4.2 | 9.8 |  | 19.4 |  |  |  |  |  |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting and related adjustments |  | 2.8 | 3.0 | 6.7 |  | 15.4 |  |  |  |  |  |  |
General and Administrative Expense | Corporate and Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense included in general and administrative expense |  | 14.3 | 17.2 | 42.2 |  | 46.3 |  |  |  |  |  |  |
Purchase accounting and related adjustments |  | $ 2.8 | $ 3.0 | 6.7 |  | 15.4 |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment general and administrative expenses |  |  |  | 65.8 |  | 81.7 |  | 109.8 |  | 101.1 |  | 90.2 |
Share-based compensation expense included in general and administrative expense |  |  |  | 10.6 | [4] | 16.4 | [4] | 19.7 | [5] | 23.4 | [5] | 26.3 | [5]
Purchase accounting and related adjustments |  |  |  | 0.0 |  | (0.3) |  | (0.3) |  | (0.5) |  | (0.5) |
Reconciles segment of general and administration |  |  |  | 76.4 |  | 97.8 |  | 129.2 |  | 124.0 |  | 116.0 |
General and administration |  |  |  | 76.4 |  | 97.8 |  | 129.2 |  | 124.0 |  | 116.0 |
Segment general and administrative expenses |  |  |  | 65.8 |  | 81.7 |  | 109.8 |  | 101.1 |  | 90.2 |
Purchase accounting and related adjustments |  |  |  | $ 107.2 |  | $ 101.2 |  | $ 136.7 |  | $ 133.9 |  | $ 128.7 |
[1] | Includes share-based compensation expense related to the allocation of Lionsgate corporate and shared employee share-based compensation expenses of $15.0 million in fiscal year 2024 (2023- $26.7 million, 2022 - $19.6 million).
[2] | (i) These adjustments include the expense associated with the noncontrolling equity interests in the distributable earnings related to 3 Arts Entertainment, and the non-cash charges for the accretion of the noncontrolling interest discount related to Pilgrim Media Group (through June 2021) and 3 Arts Entertainment (through November 2022), and the amortization of the recoupable portion of the purchase price (through May 2023) related to 3 Arts Entertainment, all of which are accounted for as compensation and are included in general and administrative expense, as presented in the table below. The noncontrolling equity interests in the distributable earnings of 3 Arts Entertainment are reflected as an expense rather than noncontrolling interest in the combined statements of operations due to the relationship to continued employment.
[3] | Purchase accounting and related adjustments primarily represent the amortization of non-cash fair value adjustments to certain assets acquired in acquisitions. The following sets forth the amounts included in each line item in the financial statements:
[4] | Includes share-based compensation expense related to the allocation of Lionsgate corporate and shared employee share-based compensation expenses of $0.7 million in the nine months ended December 31, 2024 (2023 — $4.5 million).
[5] | Includes share-based compensation expense related to the allocation of Lionsgate corporate and shared employee share-based compensation expenses of $5.6 million in fiscal year 2024 (2023- $9.7 million, 2022- $7.8 million ).

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