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Income Tax Matters - Reconciliation of Changes in Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Gross unrecognized tax benefits at beginning of period | $ 6.5 | $ 5.0 | $ 4.1
Gross increases for tax positions of current year | 0.5 | 1.3 | 0.9
Gross increases for tax positions of prior years | 0.0 | 0.2 | 0.1
Gross decreases for tax positions of prior years | (0.1) | 0.0 | (0.1)
Gross unrecognized tax benefits at end of period | $ 6.9 | $ 6.5 | $ 5.0

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