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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