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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 5,140.6 $ 4,584.8 $ 15,342.1 $ 12,946.1
Intercompany Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (17.4) 0.0 (17.4) 0.0
Americas        
Disaggregation of Revenue [Line Items]        
Revenue 997.6 929.1 3,044.8 2,776.7
Americas | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 969.8 915.2 2,976.8 2,735.9
Americas | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 27.8 13.9 68.0 40.8
Americas | United States        
Disaggregation of Revenue [Line Items]        
Revenue 644.9 578.8 1,882.5 1,705.6
Americas | United States | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 623.2 567.6 1,829.6 1,673.0
Americas | United States | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 21.7 11.2 52.9 32.6
Americas | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 352.7 350.3 1,162.3 1,071.1
Americas | Other Americas | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 346.6 347.6 1,147.2 1,062.9
Americas | Other Americas | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 6.1 2.7 15.1 8.2
Americas | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 853.8 810.2 2,659.6 2,444.6
Americas | Staffing and Interim | United States        
Disaggregation of Revenue [Line Items]        
Revenue 525.0 478.2 1,562.1 1,425.9
Americas | Staffing and Interim | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 328.8 332.0 1,097.5 1,018.7
Americas | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 58.7 43.9 141.9 124.2
Americas | Outcome-Based Solutions and Consulting | United States        
Disaggregation of Revenue [Line Items]        
Revenue 46.1 33.0 108.4 93.6
Americas | Outcome-Based Solutions and Consulting | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 12.6 10.9 33.5 30.6
Americas | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 50.1 25.3 124.5 74.7
Americas | Permanent Recruitment | United States        
Disaggregation of Revenue [Line Items]        
Revenue 40.4 21.3 100.8 62.1
Americas | Permanent Recruitment | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 9.7 4.0 23.7 12.6
Americas | Other        
Disaggregation of Revenue [Line Items]        
Revenue 35.0 49.7 118.8 133.2
Americas | Other | United States        
Disaggregation of Revenue [Line Items]        
Revenue 33.4 46.3 111.2 124.0
Americas | Other | Other Americas        
Disaggregation of Revenue [Line Items]        
Revenue 1.6 3.4 7.6 9.2
Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 2,382.6 2,112.4 6,965.3 5,527.9
Southern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 2,349.8 2,090.6 6,865.9 5,457.8
Southern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 32.8 21.8 99.4 70.1
Southern Europe | France        
Disaggregation of Revenue [Line Items]        
Revenue 1,317.0 1,205.3 3,852.7 3,035.1
Southern Europe | France | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 1,305.5 1,196.4 3,815.5 3,008.0
Southern Europe | France | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 11.5 8.9 37.2 27.1
Southern Europe | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 456.4 351.2 1,328.3 947.4
Southern Europe | Italy | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 446.3 345.6 1,297.9 929.7
Southern Europe | Italy | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 10.1 5.6 30.4 17.7
Southern Europe | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 609.2 555.9 1,784.3 1,545.4
Southern Europe | Other Southern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 598.0 548.6 1,752.5 1,520.1
Southern Europe | Other Southern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 11.2 7.3 31.8 25.3
Southern Europe | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 2,154.2 1,911.7 6,260.6 4,932.0
Southern Europe | Staffing and Interim | France        
Disaggregation of Revenue [Line Items]        
Revenue 1,220.0 1,119.8 3,545.1 2,781.5
Southern Europe | Staffing and Interim | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 432.4 335.1 1,257.3 897.2
Southern Europe | Staffing and Interim | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 501.8 456.8 1,458.2 1,253.3
Southern Europe | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 178.9 166.4 551.8 486.3
Southern Europe | Outcome-Based Solutions and Consulting | France        
Disaggregation of Revenue [Line Items]        
Revenue 79.6 72.4 249.7 213.0
Southern Europe | Outcome-Based Solutions and Consulting | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 8.7 7.0 24.6 20.7
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 90.6 87.0 277.5 252.6
Southern Europe | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 37.7 24.5 111.9 78.8
Southern Europe | Permanent Recruitment | France        
Disaggregation of Revenue [Line Items]        
Revenue 12.7 9.8 40.5 29.7
Southern Europe | Permanent Recruitment | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 11.0 6.0 32.5 19.0
Southern Europe | Permanent Recruitment | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 14.0 8.7 38.9 30.1
Southern Europe | Other        
Disaggregation of Revenue [Line Items]        
Revenue 11.8 9.8 41.0 30.8
Southern Europe | Other | France        
Disaggregation of Revenue [Line Items]        
Revenue 4.7 3.3 17.4 10.9
Southern Europe | Other | Italy        
Disaggregation of Revenue [Line Items]        
Revenue 4.3 3.1 13.9 10.5
Southern Europe | Other | Other Southern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 2.8 3.4 9.7 9.4
Northern Europe        
Disaggregation of Revenue [Line Items]        
Revenue 1,166.6 947.7 3,490.9 2,881.9
Northern Europe | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 1,135.1 928.3 3,402.0 2,818.3
Northern Europe | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 31.5 19.4 88.9 63.6
Northern Europe | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 1,049.3 845.7 3,135.7 2,563.6
Northern Europe | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 62.4 63.2 193.8 198.5
Northern Europe | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 37.0 22.2 102.6 73.1
Northern Europe | Other        
Disaggregation of Revenue [Line Items]        
Revenue 17.9 16.6 58.8 46.7
APME        
Disaggregation of Revenue [Line Items]        
Revenue 611.2 595.6 1,858.5 1,759.6
APME | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 590.5 579.1 1,796.7 1,707.9
APME | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 20.7 16.5 61.8 51.7
APME | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 461.2 469.3 1,407.5 1,386.5
APME | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 103.7 86.0 304.2 250.9
APME | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 36.0 30.0 113.2 95.1
APME | Other        
Disaggregation of Revenue [Line Items]        
Revenue 10.3 10.3 33.6 27.1
Northern Europe and APME        
Disaggregation of Revenue [Line Items]        
Revenue 5,158.0 4,584.8 15,359.5 12,946.1
Northern Europe and APME | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 5,045.2 4,513.2 15,041.4 12,719.9
Northern Europe and APME | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 112.8 71.6 318.1 226.2
Northern Europe and APME | Staffing and Interim        
Disaggregation of Revenue [Line Items]        
Revenue 4,518.5 4,036.9 13,463.4 11,326.7
Northern Europe and APME | Outcome-Based Solutions and Consulting        
Disaggregation of Revenue [Line Items]        
Revenue 403.7 359.5 1,191.7 1,059.9
Northern Europe and APME | Permanent Recruitment        
Disaggregation of Revenue [Line Items]        
Revenue 160.8 102.0 452.2 321.7
Northern Europe and APME | Other        
Disaggregation of Revenue [Line Items]        
Revenue $ 75.0 $ 86.4 $ 252.2 $ 237.8