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Income Taxes - Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |  |  |
Deferred income taxes | $ 9.2 | $ 7.4 |  |
Other noncurrent liabilities | 0.0 | 1.3 |  |
Net unrecognized tax benefits | 9.2 | 8.7 |  |
Gross unrecognized tax benefits | $ 9.2 | $ 8.7 | $ 9.5 | $ 11.0

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