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Income Taxes - Changes Occurred in Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Beginning balance of unrecognized tax benefits | $ 49.4 | $ 40.5 | $ 29.9
Additions for current year tax positions | 9.3 | 11.3 | 9.4
Additions for prior year tax positions | 2.0 | 2.5 | 6.1
Reductions for prior year tax positions | (4.7) | (0.6) | (1.0)
Reductions for audit settlements |  | (0.1) | (0.1)
Reductions for the expiration of statutes of limitation | (4.2) | (2.8) | (2.5)
Changes due to foreign currency translation adjustments | (1.3) | (1.4) | (1.3)
Ending balance of unrecognized tax benefits (excluding interest and penalties) | 50.5 | 49.4 | 40.5
Interest and penalties associated with unrecognized tax benefits | 11.5 | 8.6 | 6.7
Ending balance of unrecognized tax benefits (including interest and penalties) | $ 62.0 | $ 58.0 | $ 47.2

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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 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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