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Income Taxes - Changes in Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Unrecognized tax benefits: |  |  |
Amount beginning of year | $ 30.1 | $ 47.9 | $ 33.4
Net increase (decrease): |  |  |
Tax positions taken in prior periods | (0.4) | (19.6) | 0.5
Tax positions taken in current period | 6.4 | 3.6 | 11.3
Lapse due to applicable statute of limitations | (6.0) | (0.7) | 3.4
Changes in currency exchange rates | (1.3) | (1.1) | (0.8)
Amount at end of year | $ 28.8 | $ 30.1 | 47.9
Basic Management Inc And Landwell |  |  |
Net increase (decrease): |  |  |
Acquisition of BMI and LandWell |  |  | $ 0.1

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in 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) -URI http://asc.fasb.org/extlink&oid=6907707&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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