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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits beginning balance | $ 463.0 | $ 385.3 | $ 379.0
Increases (decreases): |  |  |
Increases in tax positions for prior years | 35.3 | 35.9 | 26.0
Decreases in tax positions for prior years | (30.9) | (20.6) | (12.3)
Increase in tax positions for the current period | 83.5 | 115.0 | 34.5
Purchase accounting adjustments (See Footnote 1 and Footnote 8) | (8.8) | 0.0 | 0.0
Currency translation adjustments | 0.4 | 0.0 | 0.0
Settlements with taxing authorities | (1.7) | (6.2) | 0.0
Lapse of statute of limitations | (66.4) | (46.4) | (41.9)
Unrecognized tax benefits ending balance | $ 474.4 | $ 463.0 | $ 385.3

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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 increase in unrecognized tax benefits resulting from foreign currency translation. + 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) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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