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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses | $ 9.2 |  | $ 9.2 | $ 13.7 |
Reserves for uncertain tax positions | 115.4 |  | 115.4 | 552.3 | $ 79.9
Unrecognized tax benefits that would impact effective tax rate | 104.2 |  | 104.2 | 91.1 | 78.5
Unrecognized tax benefits that decrease deferred tax assets | 1.4 |  | 1.4 | 3.0 |
Accrued interest and penalties |  |  | 7.4 | 2.9 | 1.7
Income tax reserve, accrued penalties and interest | 13.2 |  | 13.2 | $ 5.8 | $ 2.9
Income taxes paid | 13.2 | $ 10.5 |  |  |
Federal |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses | 1.2 |  | 1.2 |  |
State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses | 3.1 |  | 3.1 |  |
Foreign |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses | $ 4.9 |  | 4.9 |  |
Tax Years 2013-2015 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax assessments |  |  | $ 42.7 |  |

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