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Income Taxes - Changes in Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Unrecognized tax benefits: |  |  |
Amount at beginning of year | $ 9.6 | $ 13.8 | $ 21.0
Net increase (decrease): |  |  |
Tax positions taken in prior periods |  | (0.3) | (5.6)
Tax positions taken in current period | 0.6 | 0.6 | 0.7
Lapse due to applicable statute of limitations | (3.6) | (4.8) |
Settlement with taxing authorities |  |  | (2.2)
Changes in currency exchange rates | (0.2) | 0.3 | (0.1)
Amount at end of year | $ 6.4 | $ 9.6 | $ 13.8

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&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=121826272&loc=SL6600010-109319 + Details
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