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Goodwill and Other Intangible Assets - Changes in Goodwill by Reportable Segment (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Goodwill [Roll Forward] |
Balance, January 1, 2018 | $ 1,343.0
Goodwill acquired | 4.6
Currency and other impacts | (25.7)
Balance, June 30, 2018 | 1,321.9
Right Management |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 62.1
Balance, June 30, 2018 | 62.1
Reportable segments | Americas |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 519.2
Goodwill acquired | 4.6
Currency and other impacts | (2.2)
Balance, June 30, 2018 | 521.6
Reportable segments | Americas | United States | Reportable subsegments |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 476.5
Balance, June 30, 2018 | 476.5
Reportable segments | Southern Europe |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 121.9
Goodwill acquired | 0.0
Currency and other impacts | (7.5)
Balance, June 30, 2018 | 114.4
Reportable segments | Southern Europe | France | Reportable subsegments |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 76.3
Balance, June 30, 2018 | 70.2
Reportable segments | Southern Europe | Italy | Reportable subsegments |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 5.0
Balance, June 30, 2018 | 4.8
Reportable segments | Northern Europe |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 468.1
Goodwill acquired | 0.0
Currency and other impacts | (12.7)
Balance, June 30, 2018 | 455.4
Reportable segments | APME |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 106.2
Goodwill acquired | 0.0
Currency and other impacts | (3.3)
Balance, June 30, 2018 | 102.9
Reportable segments | Right Management |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 62.1
Goodwill acquired | 0.0
Currency and other impacts | 0.0
Balance, June 30, 2018 | 62.1
Corporate |
Goodwill [Roll Forward] |
Balance, January 1, 2018 | 65.5
Goodwill acquired | 0.0
Currency and other impacts | 0.0
Balance, June 30, 2018 | 65.5
Corporate | Jefferson Wells |
Goodwill [Roll Forward] |
Balance, June 30, 2018 | $ 55.5

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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