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Income Taxes - Changes in Amount of Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in unrecognized tax benefits: |  |  |
Unrecognized tax benefits at beginning of year | $ 9.7 | $ 10.4 | $ 15.9
Net increase (decrease): |  |  |
Tax positions taken in prior periods | (0.1) | (0.3) | (5.4)
Tax positions taken in current period | 2.5 | 1.1 | 1.1
Lapse due to applicable statute of limitations | (0.2) | (0.2) |
Settlements with taxing authorities | (2.3) |  |
Change in currency exchange rates | 0.3 | (1.3) | (1.2)
Unrecognized tax benefits at end of year | $ 9.9 | $ 9.7 | $ 10.4

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- Definition Unrecognized tax benefits increases (decreases) resulting from foreign currency translation. + References No definition available. + Details
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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=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&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=65882285&loc=SL6600010-109319 + Details
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