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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 13, 2024 | May 09, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Corporate expense allocation |  |  |  |  |  |  | $ 110.6 | $ 100.9 | $ 80.0
General and administration |  |  | $ 84.9 | $ 87.1 | $ 177.0 | $ 175.5 | 349.2 | 387.0 | 342.7
Corporate general and administrative expenses |  |  |  |  |  |  | 110.6 | 100.9 | 80.0
Corporate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Corporate general and administrative expenses |  |  | 28.1 | 26.5 | 59.2 | 51.0 |  |  |
Corporate Expense Allocation Excluding Share-Based Compensation | Corporate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Corporate general and administrative expenses |  |  |  | $ 26.5 | 14.2 | 51.0 |  |  |
Ignite |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Payment made for distribution rights |  |  |  |  |  |  | $ 0.3 | 0.4 |
Ignite | Michael Burns |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Equity ownership percentage excluding consolidated entity and equity method investee |  |  |  |  |  |  | 65.45% |  |
Ignite | Hardwick Simmons |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Equity ownership percentage excluding consolidated entity and equity method investee |  |  |  |  |  |  | 24.24% |  |
Related Party | Lionsgate Corporate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
General and administration |  |  | 28.1 |  | 59.2 |  |  |  |
Related Party | General and Administrative Expenses Allocated to Parent |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts of transaction |  | $ 10.0 |  |  |  |  |  |  |
Related Party | Expenses Allocated After Separation | Lionsgate Corporate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
General and administration |  |  | 28.1 |  | 45.0 |  |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
General and administration |  |  |  |  | 52.9 | 65.2 | $ 129.2 | 124.0 | 116.0
Starz Business of Lions Gate Entertainment Corp | Intercompany Revolver |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity | $ 150.0 |  |  |  |  |  |  |  |
Debt instrument variable interest rate spread | 1.75% |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Lionsgate | Treasury Function Tax Services And Employees Legal Functions | General and administration |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Costs and expenses related party |  |  |  |  | 6.1 | $ 12.1 | $ 25.6 | $ 21.9 | $ 17.2
Starz Business of Lions Gate Entertainment Corp | LIONSGATE STUDIOS CORP. | Starz Business |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Other notes payable |  |  | $ 80.4 |  | $ 80.4 |  |  |  |

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