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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue from services | $ 5,513.9 | $ 5,374.4
Outcome-Based Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 515.1 |
Global Talent Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,997.4 |
Americas Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 2,417.7 |
Americas Staffing | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,679.6 |
Americas Staffing | Educational Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 428.0 |
Americas Staffing | PT |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 272.2 |
Americas Staffing | Permanent Placement |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 37.9 |
International Staffing |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,116.6 |
International Staffing | Permanent Placement |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 28.9 |
International Staffing | Staffing Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,087.7 |
Talent Fulfillment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,482.3 |
Talent Fulfillment | Permanent Placement |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1.9 |
Talent Fulfillment | Staffing Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 1,117.6 |
Talent Fulfillment | Talent Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | 362.8 |
Intersegment Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from services | $ (17.8) |

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