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Income Taxes - Changes in Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrecognized tax benefits: |  |  |
Amount beginning of year | $ 28.8 | $ 30.1 | $ 47.9
Net increase (decrease): |  |  |
Tax positions taken in prior periods | (0.6) | (0.4) | (19.6)
Tax positions taken in current period | 11.0 | 6.4 | 3.6
Lapse due to applicable statute of limitations | (1.6) | (6.0) | (0.7)
Settlement with taxing authorities | (2.3) |  |
Changes in currency exchange rates | 0.3 | (1.3) | (1.1)
Amount at end of year | $ 35.6 | $ 28.8 | $ 30.1

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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 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=65882285&loc=SL6600010-109319 + Details
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