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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 4,924.4 | $ 4,619.1
Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4,829.9 | 4,524.6
Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 94.5 | 94.5
Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 4,310.9 | 4,035.7
Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 388.7 | 374.0
Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 135.7 | 133.3
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 89.1 | 76.1
Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,002.9 | 1,011.0
Americas | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 984.9 | 994.3
Americas | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 18.0 | 16.7
Americas | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 608.8 | 610.9
Americas | United States | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 594.7 | 597.8
Americas | United States | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 14.1 | 13.1
Americas | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 394.1 | 400.1
Americas | Other Americas | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 390.2 | 396.5
Americas | Other Americas | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.9 | 3.6
Americas | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 885.0 | 898.2
Americas | Staffing and Interim | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 510.1 | 518.7
Americas | Staffing and Interim | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 374.9 | 379.5
Americas | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 38.7 | 42.5
Americas | Outcome-Based Solutions and Consulting | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28.8 | 30.1
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9.9 | 12.4
Americas | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 34.6 | 30.5
Americas | Permanent Recruitment | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 28.5 | 25.0
Americas | Permanent Recruitment | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6.1 | 5.5
Americas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 44.6 | 39.8
Americas | Other | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 41.4 | 37.1
Americas | Other | Other Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.2 | 2.7
Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,160.3 | 1,944.7
Southern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,129.3 | 1,913.6
Southern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 31.0 | 31.1
Southern Europe | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,188.9 | 1,093.8
Southern Europe | France | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,176.9 | 1,082.1
Southern Europe | France | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.0 | 11.7
Southern Europe | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 402.8 | 327.7
Southern Europe | Italy | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 393.5 | 320.0
Southern Europe | Italy | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9.3 | 7.7
Southern Europe | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 568.6 | 523.2
Southern Europe | Other Southern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 558.9 | 511.5
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9.7 | 11.7
Southern Europe | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,926.3 | 1,721.3
Southern Europe | Staffing and Interim | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,084.0 | 998.3
Southern Europe | Staffing and Interim | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 381.5 | 307.1
Southern Europe | Staffing and Interim | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 460.8 | 415.9
Southern Europe | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 186.8 | 177.4
Southern Europe | Outcome-Based Solutions and Consulting | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 86.5 | 78.1
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 7.7 | 8.7
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 92.6 | 90.6
Southern Europe | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 34.2 | 34.6
Southern Europe | Permanent Recruitment | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12.8 | 12.5
Southern Europe | Permanent Recruitment | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 9.7 | 8.2
Southern Europe | Permanent Recruitment | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11.7 | 13.9
Southern Europe | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 13.0 | 11.4
Southern Europe | Other | France |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 5.6 | 4.9
Southern Europe | Other | Italy |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.9 | 3.7
Southern Europe | Other | Other Southern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3.5 | 2.8
Northern Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,133.8 | 1,068.5
Northern Europe | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,107.8 | 1,041.4
Northern Europe | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 26.0 | 27.1
Northern Europe | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,018.8 | 949.6
Northern Europe | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 64.8 | 70.9
Northern Europe | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 29.5 | 31.3
Northern Europe | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20.7 | 16.7
APME |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 627.4 | 594.9
APME | Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 607.9 | 575.3
APME | Services transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 19.5 | 19.6
APME | Staffing and Interim |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 480.8 | 466.6
APME | Outcome-Based Solutions and Consulting |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 98.4 | 83.2
APME | Permanent Recruitment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 37.4 | 36.9
APME | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 10.8 | $ 8.2

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