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Segment Disclosures - Segment Revenue From Service (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Revenue from Services |  |
Segment revenue from services | $ 1,369.9 | $ 1,289.7
Less: Intersegment revenue |  |
Revenue from Services |  |
Segment revenue from services | (4.9) | (4.3)
Americas Staffing | Reporting Segments |  |
Revenue from Services |  |
Segment revenue from services | 604.3 | 573.1
Global Talent Solutions | Reporting Segments |  |
Revenue from Services |  |
Segment revenue from services | 485.8 | 487.3
International Staffing | Reporting Segments |  |
Revenue from Services |  |
Segment revenue from services | $ 284.7 | $ 233.6

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