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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 1,211.8 | $ 1,202.8
Acquired goodwill, Gross Carrying Amount | 168.2 |
Foreign currency translation, Gross Carrying Amount | (8.4) | 9.0
Ending balance, Goodwill Gross Carrying Amount | 1,371.6 | 1,211.8
Beginning balance, Accumulated Impairment Loss | (145.4) | (144.3)
Impairment of goodwill, Accumulated Impairment Loss |  | (1.1)
Ending balance, Accumulated Impairment Loss | (145.4) | (145.4)
Beginning balance, Goodwill Net | 1,066.4 | 1,058.5
Acquired goodwill, Net | 168.2 |
Foreign currency translation, Net | (8.4) | 9.0
Ending balance, Goodwill Net | $ 1,226.2 | $ 1,066.4

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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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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