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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | $ 1,297,100,000 | $ 1,343,000,000.0
Goodwill acquired during the period |  |  |  | 48,000,000.0 | 6,100,000
Goodwill allocated to business units sold/deconsolidated |  |  |  | (20,100,000) | (8,800,000)
Impairment charge | $ 0 | $ 0 | $ 0 | (64,000,000.0) |
Currency impact and other |  |  |  | (900,000) | (43,200,000)
Balance at end of period |  |  |  | 1,260,100,000 | 1,297,100,000
Reportable segments | Americas |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 519,900,000 | 519,200,000
Goodwill acquired during the period |  |  |  | 14,200,000 | 4,600,000
Currency impact and other |  |  |  | 1,500,000 | (3,900,000)
Balance at end of period |  |  |  | 535,600,000 | 519,900,000
Reportable segments | Southern Europe |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 112,200,000 | 121,900,000
Goodwill acquired during the period |  |  |  | 33,800,000 |
Currency impact and other |  |  |  | (1,200,000) | (9,700,000)
Balance at end of period |  |  |  | 144,800,000 | 112,200,000
Reportable segments | Northern Europe |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 435,400,000 | 468,100,000
Goodwill allocated to business units sold/deconsolidated |  |  |  |  | (8,800,000)
Impairment charge |  |  |  | (60,200,000) |
Currency impact and other |  |  |  | (600,000) | (23,900,000)
Balance at end of period |  |  |  | 374,600,000 | 435,400,000
Reportable segments | APME |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 102,000,000.0 | 106,200,000
Goodwill acquired during the period |  |  |  |  | 1,500,000
Goodwill allocated to business units sold/deconsolidated |  |  |  | (18,500,000) |
Impairment charge |  |  |  | (3,800,000) |
Currency impact and other |  |  |  | (600,000) | (5,700,000)
Balance at end of period |  |  |  | 79,100,000 | 102,000,000.0
Reportable segments | Right Management |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 62,100,000 | 62,100,000
Balance at end of period |  |  |  | 62,100,000 | 62,100,000
Corporate |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 65,500,000 | 65,500,000
Goodwill allocated to business units sold/deconsolidated |  |  |  | (1,600,000) |
Balance at end of period |  |  |  | $ 63,900,000 | $ 65,500,000

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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=108376223&loc=d3e13816-109267 + Details
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