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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Unrecognized Tax Benefits [Line Items] |  |  |
Unrecognized tax benefits — beginning of year | $ 87.5 | $ 58.2 | $ 38.2
Gross additions — current year tax positions | 9.1 | 31.0 | 10.7
Gross additions — prior year tax positions | 9.3 | 10.9 | 10.4
Gross additions (reductions) — purchase accounting adjustments | 1.0 | 4.0 | 9.7
Gross reductions — prior year tax positions | (14.5) | (9.4) | (9.8)
Gross reductions — settlements with taxing authorities | (8.9) | (7.2) | (1.0)
Unrecognized tax benefits — end of year | $ 83.5 | $ 87.5 | $ 58.2

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- Definition Unrecognized tax benefits increases and/or decreases resulting from purchase accounting. + References No definition available. + Details
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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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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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