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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,369.9 | $ 1,289.7
Outcome-Based Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 116.2 |
Global Talent Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 485.8 |
Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 604.3 |
International Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 284.7 |
Talent Fulfillment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 369.6 |
Commercial | Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 398.4 |
Educational Staffing | Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 130.1 |
PT | Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 67.4 |
Permanent Placement | Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8.4 |
Permanent Placement | International Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 7.8 |
Permanent Placement | Talent Fulfillment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0.4 |
Staffing Solutions | International Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 276.9 |
Staffing Solutions | Talent Fulfillment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 284.2 |
Talent Solutions | Talent Fulfillment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 85.0 |
Less: Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ (4.9) |

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