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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,342.4 | $ 1,328.8 | $ 4,099.2 | $ 3,952.1
Outcome-Based Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 134.0 |  | 373.3 |
Global Talent Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 507.6 |  | 1,494.1 |
Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 561.8 |  | 1,770.1 |
International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 277.2 |  | 848.5 |
Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 373.6 |  | 1,120.8 |
Commercial | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 424.3 |  | 1,237.2 |
Educational Staffing | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 57.7 |  | 297.8 |
Professional/Technical | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 68.8 |  | 206.3 |
Permanent Placement | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.0 |  | 28.8 |
Permanent Placement | International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.8 |  | 22.1 |
Permanent Placement | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.6 |  | 1.4 |
Staffing Solutions | International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 270.4 |  | 826.4 |
Staffing Solutions | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 279.0 |  | 851.5 |
Talent Solutions | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 94.0 |  | 267.9 |
Less: Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ (4.2) |  | $ (13.5) |

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