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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Gross unrecognized tax benefits at January | $ 10.9 | $ 14.5
Increases in tax positions for current year | 1.7 | 1.6
Settlements |  | (1.8)
Lapse in statute of limitations | (1.4) | (0.7)
Increases in tax positions for prior years | 0.4 | 0.6
Decreases in tax positions for prior years | (0.9) | (3.3)
Gross unrecognized tax benefits at December | $ 10.7 | $ 10.9

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