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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue $ 5,248.9 $ 5,418.7 $ 15,666.9 $ 16,598.0
Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 5,148.5 5,304.5 15,332.7 16,235.3
Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 100.4 114.2 334.2 362.7
Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 4,670.4 4,812.1 13,882.5 14,727.6
Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 360.2 372.4 1,088.3 1,130.0
Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 137.6 152.4 445.6 479.0
Other        
Disaggregation of Revenue [Line Items]        
Revenue 80.7 81.8 250.5 261.4
Americas        
Disaggregation of Revenue [Line Items]        
Revenue 1,070.7 1,040.0 3,121.4 3,115.1
Americas | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 1,052.5 1,022.6 3,068.2 3,063.5
Americas | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 18.2 17.4 53.2 51.6
Americas | United States        
Disaggregation of Revenue [Line Items]        
Revenue 645.7 633.2 1,880.2 1,890.0
Americas | United States | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 632.1 620.4 1,839.9 1,851.5
Americas | United States | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 13.6 12.8 40.3 38.5
Americas | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 425.0 406.8 1,241.2 1,225.1
Americas | Other Americas | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 420.4 402.2 1,228.3 1,212.0
Americas | Other Americas | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 4.6 4.6 12.9 13.1
Americas | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 969.1 944.2 2,827.3 2,827.0
Americas | Staffing and Interim | United States        
Disaggregation of Revenue [Line Items]        
Revenue 564.5 556.1 1,644.5 1,658.4
Americas | Staffing and Interim | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 404.6 388.1 1,182.8 1,168.6
Americas | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 46.0 42.9 134.1 130.3
Americas | Outcome-Based Solutions and Consulting | United States        
Disaggregation of Revenue [Line Items]        
Revenue 33.5 31.5 97.6 95.4
Americas | Outcome-Based Solutions and Consulting | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 12.5 11.4 36.5 34.9
Americas | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 31.9 29.8 90.9 88.5
Americas | Permanent Recruitment | United States        
Disaggregation of Revenue [Line Items]        
Revenue 25.2 23.7 72.2 69.9
Americas | Permanent Recruitment | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 6.7 6.1 18.7 18.6
Americas | Other        
Disaggregation of Revenue [Line Items]        
Revenue 23.7 23.1 69.1 69.3
Americas | Other | United States        
Disaggregation of Revenue [Line Items]        
Revenue 22.5 21.9 65.9 66.3
Americas | Other | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 1.2 1.2 3.2 3.0
Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 2,351.6 2,331.6 6,841.0 7,077.6
Southern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 2,320.2 2,301.0 6,738.9 6,976.1
Southern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 31.4 30.6 102.1 101.5
Southern Europe | France        
Disaggregation of Revenue [Line Items]        
Revenue 1,382.1 1,460.6 4,103.7 4,397.1
Southern Europe | France | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 1,370.8 1,448.5 4,066.0 4,356.6
Southern Europe | France | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 11.3 12.1 37.7 40.5
Southern Europe | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 376.6 410.2 1,126.5 1,266.8
Southern Europe | Italy | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 369.3 402.8 1,100.0 1,241.2
Southern Europe | Italy | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 7.3 7.4 26.5 25.6
Southern Europe | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 592.9 460.8 1,610.8 1,413.7
Southern Europe | Other Southern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 580.1 449.7 1,572.9 1,378.3
Southern Europe | Other Southern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 12.8 11.1 37.9 35.4
Southern Europe | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 2,158.8 2,146.7 6,243.1 6,491.5
Southern Europe | Staffing and Interim | France        
Disaggregation of Revenue [Line Items]        
Revenue 1,309.8 1,390.0 3,880.0 4,171.4
Southern Europe | Staffing and Interim | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 354.9 386.5 1,050.1 1,187.4
Southern Europe | Staffing and Interim | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 494.1 370.2 1,313.0 1,132.7
Southern Europe | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 148.8 137.6 447.3 430.5
Southern Europe | Outcome-Based Solutions and Consulting | France        
Disaggregation of Revenue [Line Items]        
Revenue 56.6 53.3 170.6 167.6
Southern Europe | Outcome-Based Solutions and Consulting | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 10.2 11.5 31.4 35.8
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 82.0 72.8 245.3 227.1
Southern Europe | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 35.6 34.2 114.5 111.6
Southern Europe | Permanent Recruitment | France        
Disaggregation of Revenue [Line Items]        
Revenue 12.1 12.7 40.2 42.1
Southern Europe | Permanent Recruitment | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 8.1 8.0 28.7 27.4
Southern Europe | Permanent Recruitment | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 15.4 13.5 45.6 42.1
Southern Europe | Other        
Disaggregation of Revenue [Line Items]        
Revenue 8.4 13.1 36.1 44.0
Southern Europe | Other | France        
Disaggregation of Revenue [Line Items]        
Revenue 3.6 4.6 12.9 16.0
Southern Europe | Other | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 3.4 4.2 16.3 16.2
Southern Europe | Other | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 1.4 4.3 6.9 11.8
Northern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 1,156.6 1,287.1 3,529.5 4,097.9
Northern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 1,127.4 1,255.9 3,433.9 3,989.9
Northern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 29.2 31.2 95.6 108.0
Northern Europe | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 1,037.2 1,138.8 3,141.4 3,628.0
Northern Europe | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 78.0 104.3 254.2 320.2
Northern Europe | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 33.6 36.6 109.9 126.1
Northern Europe | Other        
Disaggregation of Revenue [Line Items]        
Revenue 7.8 7.4 24.0 23.6
APME        
Disaggregation of Revenue [Line Items]        
Revenue 621.9 713.0 2,030.7 2,158.0
APME | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 600.3 678.0 1,947.4 2,056.4
APME | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 21.6 35.0 83.3 101.6
APME | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 505.3 582.4 1,670.7 1,781.1
APME | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 76.6 75.4 219.5 212.8
APME | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 36.5 51.8 130.3 152.8
APME | Other        
Disaggregation of Revenue [Line Items]        
Revenue 3.5 3.4 10.2 11.3
Right Management        
Disaggregation of Revenue [Line Items]        
Revenue 48.1 47.0 144.3 149.4
Right Management | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 48.1 47.0 144.3 149.4
Right Management | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Right Management | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Right Management | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 10.8 12.2 33.2 36.2
Right Management | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Right Management | Other        
Disaggregation of Revenue [Line Items]        
Revenue $ 37.3 $ 34.8 $ 111.1 $ 113.2