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Income Taxes - Summary of Changes in Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gross Unrecognized Tax Benefits |  |  |
Balance at beginning of period | $ 33.2 | $ 29.5 | $ 30.4
Additions based on tax positions related to current year | 7.9 | 5.4 | 4.0
Additions based on tax positions related to prior years | 0.1 |  |
Reductions based on tax positions related to prior years |  | (0.3) | (0.9)
Settlements | 0.0 | (0.8) | 0.0
Statute expirations | (2.7) | (2.2) | (2.9)
Foreign currency translation | (1.8) |  | (1.1)
Foreign currency translation |  | 1.6 |
Balance at end of period | $ 36.7 | $ 33.2 | $ 29.5

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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