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Income Taxes - Changes In Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits—beginning balance | $ 12.4 | $ 3.2 | $ 7.9
Gross increases—prior period tax positions | 14.8 | 8.4 |
Gross decreases—prior period tax positions |  |  | (0.2)
Gross increases—current period tax positions | 4.4 | 5.2 | 0.8
Settlements with taxing authorities | 0.0 | (4.4) | (5.3)
Unrecognized tax benefits—ending balance | $ 31.6 | $ 12.4 | $ 3.2

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