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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |
Gross unrecognized tax benefits at January | $ 11.5 | $ 10.7
Increases in tax positions for current year | 2.9 | 2.1
Settlements | (1.1) | (0.4)
Lapse in statute of limitations | (1.2) | (1.1)
Increases in tax positions for prior years | 0.2 | 0.6
Decreases in tax positions for prior years | (1.1) | (0.4)
Gross unrecognized tax benefits at December | $ 11.2 | $ 11.5

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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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