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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits at beginning of year | $ 50.7 | $ 58.8 | $ 57.9
Increases resulting from tax positions taken during a prior period | 3.8 | 10.8 | 6.4
Decreases resulting from tax positions taken during a prior period | (4.5) | (18.6) | (4.2)
Increases resulting from tax positions taken during the current period | 7.4 | 6.7 | 6.4
Decreases related to settlements with taxing authorities | (3.8) | (1.0) | (0.3)
Increases related to settlements with taxing authorities | 0.0 | 0.0 | 0.0
Reductions related to the lapse of statute of limitations | (5.1) | (6.0) | (7.4)
Unrecognized tax benefits at end of year | $ 48.5 | $ 50.7 | $ 58.8

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