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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 1,202.8 | $ 731.3
Acquired goodwill, Gross Carrying Amount |  | 474.0
Foreign currency translation, Gross Carrying Amount | 9.0 | (2.5)
Ending balance, Goodwill Gross Carrying Amount | 1,211.8 | 1,202.8
Beginning balance, Accumulated Impairment Loss | (144.3) | (144.3)
Impairment of goodwill, Accumulated Impairment Loss | (1.1) |
Ending balance, Accumulated Impairment Loss | (145.4) | (144.3)
Beginning balance, Goodwill Net | 1,058.5 | 587.0
Acquired goodwill, Net |  | 474.0
Impairment of goodwill, Net | (1.1) |
Foreign currency translation, Net | 9.0 | (2.5)
Ending balance, Goodwill Net | $ 1,066.4 | $ 1,058.5

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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