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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 3,742.2 | $ 5,373.1 | $ 8,361.3 | $ 10,418.0
Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,682.1 | 5,252.9 | 8,206.7 | 10,184.2
Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 60.1 | 120.2 | 154.6 | 233.8
Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,254.1 | 4,759.7 | 7,289.8 | 9,212.1
Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 326.4 | 369.3 | 700.4 | 728.1
Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 86.4 | 158.9 | 219.7 | 308.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 75.3 | 85.2 | 151.4 | 169.8
Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 836.6 | 1,068.2 | 1,847.6 | 2,098.4
Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 826.4 | 1,050.2 | 1,820.7 | 2,063.4
Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10.2 | 18.0 | 26.9 | 35.0
Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 515.9 | 652.7 | 1,126.8 | 1,275.9
Americas | United States | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 507.6 | 639.0 | 1,105.4 | 1,249.2
Americas | United States | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.3 | 13.7 | 21.4 | 26.7
Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 320.7 | 415.5 | 720.8 | 822.5
Americas | Other Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 318.8 | 411.2 | 715.3 | 814.2
Americas | Other Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.9 | 4.3 | 5.5 | 8.3
Americas | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 736.2 | 944.1 | 1,634.4 | 1,858.2
Americas | Staffing and Interim | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 429.0 | 551.3 | 947.7 | 1,080.0
Americas | Staffing and Interim | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 307.2 | 392.8 | 686.7 | 778.2
Americas | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37.8 | 51.7 | 80.3 | 99.1
Americas | Outcome-Based Solutions and Consulting | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 30.5 | 38.4 | 60.6 | 73.3
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7.3 | 13.3 | 19.7 | 25.8
Americas | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18.9 | 30.3 | 49.4 | 59.0
Americas | Permanent Recruitment | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15.8 | 24.1 | 40.8 | 47.0
Americas | Permanent Recruitment | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.1 | 6.2 | 8.6 | 12.0
Americas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 43.7 | 42.1 | 83.5 | 82.1
Americas | Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 40.6 | 38.9 | 77.7 | 75.6
Americas | Other | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.1 | 3.2 | 5.8 | 6.5
Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,470.8 | 2,394.3 | 3,415.5 | 4,503.1
Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,453.6 | 2,358.6 | 3,367.2 | 4,432.4
Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17.2 | 35.7 | 48.3 | 70.7
Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 736.0 | 1,425.3 | 1,829.8 | 2,731.4
Southern Europe | France | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 729.5 | 1,412.6 | 1,811.6 | 2,705.0
Southern Europe | France | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.5 | 12.7 | 18.2 | 26.4
Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 268.5 | 394.4 | 596.2 | 750.8
Southern Europe | Italy | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 264.1 | 384.6 | 584.1 | 731.6
Southern Europe | Italy | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4.4 | 9.8 | 12.1 | 19.2
Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 466.3 | 574.6 | 989.5 | 1,020.9
Southern Europe | Other Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 460.0 | 561.4 | 971.5 | 995.8
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.3 | 13.2 | 18.0 | 25.1
Southern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,299.0 | 2,182.8 | 3,020.3 | 4,084.3
Southern Europe | Staffing and Interim | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 663.4 | 1,345.7 | 1,661.7 | 2,570.2
Southern Europe | Staffing and Interim | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 255.0 | 365.2 | 562.1 | 695.2
Southern Europe | Staffing and Interim | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 380.6 | 471.9 | 796.5 | 818.9
Southern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 142.5 | 154.0 | 319.9 | 303.1
Southern Europe | Outcome-Based Solutions and Consulting | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 62.5 | 58.4 | 140.6 | 117.1
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5.0 | 11.9 | 13.7 | 21.7
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 75.0 | 83.7 | 165.6 | 164.3
Southern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 19.7 | 40.3 | 54.3 | 78.9
Southern Europe | Permanent Recruitment | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7.4 | 13.6 | 19.9 | 28.1
Southern Europe | Permanent Recruitment | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4.8 | 10.7 | 13.0 | 20.6
Southern Europe | Permanent Recruitment | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7.5 | 16.0 | 21.4 | 30.2
Southern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.6 | 17.2 | 21.0 | 36.8
Southern Europe | Other | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2.7 | 7.6 | 7.6 | 16.0
Southern Europe | Other | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.7 | 6.6 | 7.4 | 13.3
Southern Europe | Other | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.2 | 3.0 | 6.0 | 7.5
Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 865.7 | 1,194.1 | 1,934.2 | 2,394.6
Northern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 848.6 | 1,160.8 | 1,890.0 | 2,328.2
Northern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17.1 | 33.3 | 44.2 | 66.4
Northern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 768.3 | 1,050.8 | 1,717.9 | 2,104.2
Northern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 64.4 | 88.3 | 135.3 | 179.8
Northern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 19.6 | 38.2 | 50.9 | 76.3
Northern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.4 | 16.8 | 30.1 | 34.3
APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 569.1 | 716.5 | 1,164.0 | 1,421.9
APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 553.5 | 683.3 | 1,128.8 | 1,360.2
APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15.6 | 33.2 | 35.2 | 61.7
APME | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 450.6 | 582.0 | 917.2 | 1,165.4
APME | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 81.7 | 75.3 | 164.9 | 146.1
APME | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 28.2 | 50.1 | 65.1 | 93.8
APME | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 8.6 | $ 9.1 | $ 16.8 | $ 16.6

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