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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 5,143.3 | $ 4,924.4
Intercompany Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 14.5 |
Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,251.2 | 1,002.9
Americas | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,213.8 | 984.9
Americas | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 37.4 | 18.0
Americas | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 889.4 | 608.8
Americas | United States | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 858.8 | 594.7
Americas | United States | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 30.6 | 14.1
Americas | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 361.8 | 394.1
Americas | Other Americas | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 355.0 | 390.2
Americas | Other Americas | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6.8 | 3.9
Americas | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,076.8 | 885.0
Americas | Staffing and Interim | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 739.9 | 510.1
Americas | Staffing and Interim | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 336.9 | 374.9
Americas | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 69.1 | 38.7
Americas | Outcome-Based Solutions and Consulting | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 57.1 | 28.8
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.0 | 9.9
Americas | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 65.4 | 34.6
Americas | Permanent Recruitment | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 54.2 | 28.5
Americas | Permanent Recruitment | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11.2 | 6.1
Americas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 39.9 | 44.6
Americas | Other | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 38.2 | 41.4
Americas | Other | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1.7 | 3.2
Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,193.9 | 2,160.3
Southern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,152.7 | 2,129.3
Southern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 41.2 | 31.0
Southern Europe | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,192.4 | 1,188.9
Southern Europe | France | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,177.0 | 1,176.9
Southern Europe | France | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 15.4 | 12.0
Southern Europe | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 445.0 | 402.8
Southern Europe | Italy | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 432.4 | 393.5
Southern Europe | Italy | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.6 | 9.3
Southern Europe | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 556.5 | 568.6
Southern Europe | Other Southern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 543.3 | 558.9
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 13.2 | 9.7
Southern Europe | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,962.8 | 1,926.3
Southern Europe | Staffing and Interim | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,101.5 | 1,084.0
Southern Europe | Staffing and Interim | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 417.8 | 381.5
Southern Europe | Staffing and Interim | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 443.5 | 460.8
Southern Europe | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 172.5 | 186.8
Southern Europe | Outcome-Based Solutions and Consulting | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 70.3 | 86.5
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8.1 | 7.7
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 94.1 | 92.6
Southern Europe | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 46.0 | 34.2
Southern Europe | Permanent Recruitment | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 16.5 | 12.8
Southern Europe | Permanent Recruitment | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 13.7 | 9.7
Southern Europe | Permanent Recruitment | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 15.8 | 11.7
Southern Europe | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.6 | 13.0
Southern Europe | Other | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4.1 | 5.6
Southern Europe | Other | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5.4 | 3.9
Southern Europe | Other | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.1 | 3.5
Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,094.5 | 1,133.8
Northern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,057.2 | 1,107.8
Northern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 37.3 | 26.0
Northern Europe | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 977.1 | 1,018.8
Northern Europe | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 55.0 | 64.8
Northern Europe | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 45.3 | 29.5
Northern Europe | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17.1 | 20.7
APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 618.2 | 627.4
APME | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 597.1 | 607.9
APME | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 21.1 | 19.5
APME | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 463.1 | 480.8
APME | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 109.3 | 98.4
APME | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 37.2 | 37.4
APME | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8.6 | 10.8
Northern Europe and APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5,157.8 | 4,924.4
Reportable Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5,157.8 | 4,924.4
Reportable Segments | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5,020.8 | 4,829.9
Reportable Segments | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 137.0 | 94.5
Reportable Segments | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4,479.8 | 4,310.9
Reportable Segments | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 405.9 | 388.7
Reportable Segments | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 193.9 | 135.7
Reportable Segments | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 78.2 | $ 89.1

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