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Income Taxes - Changes in Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecognized tax benefits: |  |  |
Amount beginning of year | $ 35.6 | $ 28.8 | $ 30.1
Net increase (decrease): |  |  |
Tax positions taken in prior periods | (13.3) | (0.6) | (0.4)
Tax positions taken in current period | 4.5 | 11.0 | 6.4
Lapse due to applicable statute of limitations | (8.1) | (1.6) | (6.0)
Settlement with taxing authorities | (2.3) | (2.3) |
Changes in currency exchange rates | 0.7 | 0.3 | (1.3)
Amount at end of year | $ 17.1 | $ 35.6 | $ 28.8

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -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/presentationRef -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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- Definition Unrecognized tax benefits increase decrease resulting from lapse of applicable statute of limitations. + References No definition available. + Details
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- Definition Unrecognized tax benefits increases decrease resulting from prior period tax positions. + References No definition available. + Details
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- Definition The increase or decrease in the unrecognized tax benefits for uncertain tax positions during the reporting period related to currency translations. + References No definition available. + Details
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