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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Gross unrecognized tax benefits at January | $ 10.7 | $ 10.9
Increases in tax positions for current year | 2.1 | 1.7
Settlements | (0.4) |
Lapse in statute of limitations | (1.1) | (1.4)
Increases in tax positions for prior years | 0.6 | 0.4
Decreases in tax positions for prior years | (0.4) | (0.9)
Gross unrecognized tax benefits at December | $ 11.5 | $ 10.7

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