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Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |
Balance at beginning of period | $ 2,414.0 | $ 2,396.8
Acquisitions | 1,080.4 | 17.3
Divestitures |  | (0.1)
Balance at end of period | 3,494.4 | 2,414.0
East Group |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 572.5 | 574.3
Acquisitions | 186.9 |
Goodwill reclassified from/(allocated to) assets held for sale |  | 0.1
Transfer of operations from East Group to West Group |  | (1.9)
Balance at end of period | 759.4 | 572.5
West Group |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 1,841.5 | 1,822.5
Acquisitions | 893.5 | 17.3
Goodwill reclassified from/(allocated to) assets held for sale |  | (0.1)
Divestitures |  | (0.1)
Transfer of operations from East Group to West Group |  | 1.9
Balance at end of period | $ 2,735.0 | $ 1,841.5

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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://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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