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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 5,656.9 | $ 11,179.3
Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,052.5 | 2,075.1
Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,434.0 | 4,746.0
Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,393.2 | 2,810.8
APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 724.8 | 1,445.0
Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 52.4 | 102.4
Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 5,019.4 | 9,915.5
Staffing and Interim | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 951.4 | 1,882.8
Staffing and Interim | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,234.5 | 4,344.8
Staffing and Interim | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,234.0 | 2,489.2
Staffing and Interim | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 599.5 | 1,198.7
Staffing and Interim | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0.0 | 0.0
Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 379.1 | 757.6
Outcome-Based Solutions and Consulting | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 46.9 | 87.4
Outcome-Based Solutions and Consulting | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 144.6 | 292.9
Outcome-Based Solutions and Consulting | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 106.1 | 215.9
Outcome-Based Solutions and Consulting | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 69.0 | 137.4
Outcome-Based Solutions and Consulting | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 12.5 | 24.0
Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 166.7 | 326.6
Permanent Recruitment | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 30.9 | 58.7
Permanent Recruitment | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38.8 | 77.4
Permanent Recruitment | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45.0 | 89.5
Permanent Recruitment | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 52.0 | 101.0
Permanent Recruitment | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0.0 | 0.0
Products and Services, Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 91.7 | 179.6
Products and Services, Other | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 23.3 | 46.2
Products and Services, Other | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16.1 | 30.9
Products and Services, Other | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8.1 | 16.2
Products and Services, Other | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 4.3 | 7.9
Products and Services, Other | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 39.9 | 78.4
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 5,529.8 | 10,930.8
Transferred over time | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,034.5 | 2,040.9
Transferred over time | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,398.6 | 4,675.1
Transferred over time | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,354.8 | 2,734.0
Transferred over time | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 689.5 | 1,378.4
Transferred over time | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 52.4 | 102.4
Transferred at point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 127.1 | 248.5
Transferred at point in time | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 18.0 | 34.2
Transferred at point in time | Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 35.4 | 70.9
Transferred at point in time | Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38.4 | 76.8
Transferred at point in time | APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 35.3 | 66.6
Transferred at point in time | Right Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0.0 | $ 0.0

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