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Income Taxes - Summary Of Differences Between Income Tax Rates And The Income Tax Provision (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Schedule Of Differences Between Income Taxes Expected At US Statutory Income Tax Rates And The Income Tax Provision [Line Items] |  |  |  |  |  |  |
Income taxes computed at U.S. federal statutory rate |  |  |  |  | $ (15.3) | $ 1.1 | $ 2.4
Foreign operations subject to different income tax rates |  |  |  |  | 6.8 | 5.0 | 7.1
State income tax |  |  |  |  | 5.9 | (0.6) | 3.5
Remeasurements of originating deferred tax assets and liabilities |  |  |  |  | 4.7 | (4.7) | (9.2)
Permanent differences |  |  |  |  | 0.1 | 2.1 | 0.0
Nondeductible share-based compensation |  |  |  |  | 1.2 | 1.8 | (2.7)
Nondeductible officers compensation |  |  |  |  | 7.7 | 9.8 | 5.1
Non-controlling interest in partnerships |  |  |  |  | 18.6 | 1.8 | 3.7
Foreign derived intangible income |  |  |  |  | (2.4) | (1.4) | 0.0
Other |  |  |  |  | 2.7 | 1.7 | 1.5
Changes in valuation allowance |  |  |  |  | 4.2 | (2.3) | 5.9
Total provision for income taxes | $ 5.1 | $ 3.9 | $ 10.1 | $ 10.4 | 34.2 | 14.3 | 17.3
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Schedule Of Differences Between Income Taxes Expected At US Statutory Income Tax Rates And The Income Tax Provision [Line Items] |  |  |  |  |  |  |
Income taxes computed at U.S. federal statutory rate |  |  |  |  | (196.0) | (284.4) | (4.8)
Foreign operations subject to different income tax rates |  |  |  |  | 1.1 | 0.3 | (0.9)
State income tax |  |  |  |  | (15.0) | (2.2) | 5.7
Remeasurements of originating deferred tax assets and liabilities |  |  |  |  | 47.6 | (0.4) | (1.0)
Permanent differences |  |  |  |  | 0.1 | (0.3) | 1.6
Excess tax benefit on share based compensation |  |  |  |  | 0.0 | 0.0 | (0.6)
Income tax effects of goodwill and intangible asset impairments |  |  |  |  | 64.5 | 196.5 | 0.0
Uncertain tax positions |  |  |  |  | (70.3) | 5.0 | 3.2
Other |  |  |  |  | 0.0 | 0.8 | 0.0
Changes in valuation allowance |  |  |  |  | 39.1 | 66.4 | 3.9
Total provision for income taxes |  |  | $ (7.2) | $ (74.3) | $ (128.9) | $ (18.3) | $ 7.1

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