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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 1,260,100,000 | $ 1,297,100,000 |
Goodwill acquired during the period |  |  |  | 0 | 48,000,000.0 | $ 6,100,000
Goodwill allocated to business units sold/deconsolidated |  |  |  |  | (20,100,000) |
Impairment charge | $ 0 | $ 0 | $ 0 | (66,800,000) | (64,000,000.0) |
Currency impact and other |  |  |  | 32,500,000 | (900,000) |
Balance at end of period |  |  |  | 1,225,800,000 | 1,260,100,000 | 1,297,100,000
Reportable segments | Americas |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 535,600,000 | 519,900,000 |
Goodwill acquired during the period |  |  |  |  | 14,200,000 |
Currency impact and other |  |  |  | 1,000,000.0 | 1,500,000 |
Balance at end of period |  |  |  | 536,600,000 | 535,600,000 | 519,900,000
Reportable segments | Southern Europe |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 144,800,000 | 112,200,000 |
Goodwill acquired during the period |  |  |  |  | 33,800,000 |
Currency impact and other |  |  |  | 10,100,000 | (1,200,000) |
Balance at end of period |  |  |  | 154,900,000 | 144,800,000 | 112,200,000
Reportable segments | Northern Europe |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 374,600,000 | 435,400,000 |
Impairment charge |  |  |  | (66,800,000) | (60,200,000) |
Currency impact and other |  |  |  | 18,800,000 | (600,000) |
Balance at end of period |  |  |  | 326,600,000 | 374,600,000 | 435,400,000
Reportable segments | APME |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 79,100,000 | 102,000,000.0 |
Goodwill allocated to business units sold/deconsolidated |  |  |  |  | (18,500,000) |
Impairment charge |  |  |  |  | (3,800,000) |
Currency impact and other |  |  |  | 2,600,000 | (600,000) |
Balance at end of period |  |  |  | 81,700,000 | 79,100,000 | 102,000,000.0
Corporate |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 126,000,000.0 | 127,600,000 |
Goodwill allocated to business units sold/deconsolidated |  |  |  |  | (1,600,000) |
Balance at end of period |  |  |  | $ 126,000,000.0 | $ 126,000,000.0 | $ 127,600,000

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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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