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Intangible Assets, Goodwill and Acquisitions - Summary of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2020
Goodwill [Line Items] |  |  |
Beginning balance |  | $ 1,859.3 | $ 1,810.4
Acquisitions |  | 84.0 | 64.4
Impairment Loss | $ (15.5) |  | (15.5)
Ending balance | 1,859.3 | 1,943.3 | 1,859.3
Maintenance Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 1,680.4 | 1,616.0
Acquisitions |  | 73.0 | 64.4
Ending balance | 1,680.4 | 1,753.4 | 1,680.4
Development Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 178.9 | 194.4
Acquisitions |  | 11.0 |
Impairment Loss |  |  | (15.5)
Ending balance | $ 178.9 | $ 189.9 | $ 178.9

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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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