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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,367.5 | $ 1,386.9 | $ 2,750.1 | $ 2,756.8
Outcome-Based Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 153.9 | 123.1 | 309.3 | 239.3
Global Talent Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 505.9 | 500.7 | 1,006.9 | 986.5
Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 597.6 | 604.0 | 1,224.1 | 1,208.3
International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 268.1 | 286.6 | 527.0 | 571.3
Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 352.0 | 377.6 | 697.6 | 747.2
Commercial | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 384.1 | 414.5 | 776.6 | 812.9
Educational Staffing | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 117.4 | 110.0 | 257.0 | 240.1
Professional/Technical | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 87.3 | 70.1 | 172.8 | 137.5
Permanent Placement | Americas Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.8 | 9.4 | 17.7 | 17.8
Permanent Placement | International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.4 | 7.5 | 13.1 | 15.3
Permanent Placement | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0.5 | 0.4 | 0.8 | 0.8
Staffing Solutions | International Staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 261.7 | 279.1 | 513.9 | 556.0
Staffing Solutions | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 258.2 | 288.3 | 513.8 | 572.5
Talent Solutions | Talent Fulfillment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 93.3 | 88.9 | 183.0 | 173.9
Less: Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ (4.1) | $ (4.4) | $ (7.9) | $ (9.3)

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