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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 5,418.7 | $ 16,598.0
Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,040.0 | 3,115.1
Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,331.6 | 7,077.6
Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,287.1 | 4,097.9
APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 713.0 | 2,158.0
Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 47.0 | 149.4
Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,812.1 | 14,727.6
Staffing and Interim | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 944.2 | 2,827.0
Staffing and Interim | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,146.7 | 6,491.5
Staffing and Interim | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,138.8 | 3,628.0
Staffing and Interim | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 582.4 | 1,781.1
Staffing and Interim | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 372.4 | 1,130.0
Outcome-Based Solutions and Consulting | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 42.9 | 130.3
Outcome-Based Solutions and Consulting | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 137.6 | 430.5
Outcome-Based Solutions and Consulting | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 104.3 | 320.2
Outcome-Based Solutions and Consulting | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 75.4 | 212.8
Outcome-Based Solutions and Consulting | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 12.2 | 36.2
Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 152.4 | 479.0
Permanent Recruitment | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 29.8 | 88.5
Permanent Recruitment | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 34.2 | 111.6
Permanent Recruitment | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 36.6 | 126.1
Permanent Recruitment | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 51.8 | 152.8
Permanent Recruitment | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Products and Services, Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 81.8 | 261.4
Products and Services, Other | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23.1 | 69.3
Products and Services, Other | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 13.1 | 44.0
Products and Services, Other | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7.4 | 23.6
Products and Services, Other | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3.4 | 11.3
Products and Services, Other | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 34.8 | 113.2
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,304.5 | 16,235.3
Transferred over time | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,022.6 | 3,063.5
Transferred over time | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,301.0 | 6,976.1
Transferred over time | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,255.9 | 3,989.9
Transferred over time | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 678.0 | 2,056.4
Transferred over time | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 47.0 | 149.4
Transferred at point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 114.2 | 362.7
Transferred at point in time | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17.4 | 51.6
Transferred at point in time | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 30.6 | 101.5
Transferred at point in time | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 31.2 | 108.0
Transferred at point in time | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 35.0 | 101.6
Transferred at point in time | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0.0 | $ 0.0

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