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Goodwill - Changes in the Net Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Oct. 01, 2017 | Jan. 01, 2017
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | $ 189.3
Accumulated Impairment Losses |  | (100.9)
Allocation of Goodwill | $ 0.0 |
Additions to Goodwill | 18.7 |
Goodwill | 107.1 | 88.4
Americas Commercial |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 40.0
Accumulated Impairment Losses |  | (16.4)
Allocation of Goodwill | (23.6) |
Goodwill | 0.0 | 23.6
Americas PT |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 37.9
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | (37.9) |
Goodwill | 0.0 | 37.9
EMEA Commercial |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 50.4
Accumulated Impairment Losses |  | (50.4)
Allocation of Goodwill | 0.0 |
Goodwill | 0.0 | 0.0
EMEA PT |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 22.0
Accumulated Impairment Losses |  | (22.0)
Allocation of Goodwill | 0.0 |
Goodwill | 0.0 | 0.0
APAC Commercial |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 12.1
Accumulated Impairment Losses |  | (12.1)
Allocation of Goodwill | 0.0 |
Goodwill | 0.0 | 0.0
APAC PT |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 0.0
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | 0.0 |
Goodwill | 0.0 | 0.0
OCG |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 26.9
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | (26.9) |
Goodwill | 0.0 | 26.9
Americas Staffing |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 0.0
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | 25.9 |
Additions to Goodwill | 18.7 |
Goodwill | 44.6 | 0.0
Global Talent Solutions |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 0.0
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | 62.5 |
Goodwill | 62.5 | 0.0
International Staffing |  |
Goodwill [Roll Forward] |  |
Goodwill, Gross |  | 0.0
Accumulated Impairment Losses |  | 0.0
Allocation of Goodwill | 0.0 |
Goodwill | $ 0.0 | $ 0.0

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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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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