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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,074.1 | $ 5,277.1 | $ 10,217.4 | $ 10,201.5
Intercompany Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (20.8) | 0.0 | (35.3) | 0.0
Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,262.7 | 1,044.3 | 2,513.9 | 2,047.2
Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,221.7 | 1,022.1 | 2,435.5 | 2,007.0
Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 41.0 | 22.2 | 78.4 | 40.2
Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 903.9 | 628.8 | 1,793.3 | 1,237.6
Americas | United States | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 871.0 | 611.7 | 1,729.8 | 1,206.4
Americas | United States | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 32.9 | 17.1 | 63.5 | 31.2
Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 358.8 | 415.5 | 720.6 | 809.6
Americas | Other Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 350.7 | 410.4 | 705.7 | 800.6
Americas | Other Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.1 | 5.1 | 14.9 | 9.0
Americas | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,074.6 | 920.8 | 2,151.4 | 1,805.8
Americas | Staffing and Interim | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 742.7 | 527.0 | 1,482.6 | 1,037.1
Americas | Staffing and Interim | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 331.9 | 393.8 | 668.8 | 768.7
Americas | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 78.4 | 44.5 | 147.5 | 83.2
Americas | Outcome-Based Solutions and Consulting | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 65.9 | 33.5 | 123.0 | 62.3
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12.5 | 11.0 | 24.5 | 20.9
Americas | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 70.9 | 39.8 | 136.3 | 74.4
Americas | Permanent Recruitment | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 58.0 | 31.9 | 112.2 | 60.4
Americas | Permanent Recruitment | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12.9 | 7.9 | 24.1 | 14.0
Americas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 38.8 | 39.2 | 78.7 | 83.8
Americas | Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37.3 | 36.4 | 75.5 | 77.8
Americas | Other | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1.5 | 2.8 | 3.2 | 6.0
Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,201.4 | 2,422.4 | 4,395.3 | 4,582.7
Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,160.2 | 2,386.8 | 4,312.9 | 4,516.1
Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 41.2 | 35.6 | 82.4 | 66.6
Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,238.2 | 1,346.8 | 2,430.6 | 2,535.7
Southern Europe | France | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,223.4 | 1,333.1 | 2,400.4 | 2,510.0
Southern Europe | France | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14.8 | 13.7 | 30.2 | 25.7
Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 454.3 | 469.1 | 899.3 | 871.9
Southern Europe | Italy | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 440.9 | 458.1 | 873.3 | 851.6
Southern Europe | Italy | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.4 | 11.0 | 26.0 | 20.3
Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 508.9 | 606.5 | 1,065.4 | 1,175.1
Southern Europe | Other Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 495.9 | 595.6 | 1,039.2 | 1,154.5
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.0 | 10.9 | 26.2 | 20.6
Southern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,976.8 | 2,180.1 | 3,939.6 | 4,106.4
Southern Europe | Staffing and Interim | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,149.9 | 1,241.1 | 2,251.4 | 2,325.1
Southern Europe | Staffing and Interim | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 423.9 | 443.4 | 841.7 | 824.9
Southern Europe | Staffing and Interim | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 403.0 | 495.6 | 846.5 | 956.4
Southern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 164.7 | 186.1 | 337.2 | 372.9
Southern Europe | Outcome-Based Solutions and Consulting | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 68.3 | 83.6 | 138.6 | 170.1
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.2 | 8.2 | 17.3 | 15.9
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 87.2 | 94.3 | 181.3 | 186.9
Southern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46.8 | 40.0 | 92.8 | 74.2
Southern Europe | Permanent Recruitment | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 16.4 | 15.0 | 32.9 | 27.8
Southern Europe | Permanent Recruitment | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14.5 | 11.8 | 28.2 | 21.5
Southern Europe | Permanent Recruitment | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15.9 | 13.2 | 31.7 | 24.9
Southern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.1 | 16.2 | 25.7 | 29.2
Southern Europe | Other | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3.6 | 7.1 | 7.7 | 12.7
Southern Europe | Other | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 6.7 | 5.7 | 12.1 | 9.6
Southern Europe | Other | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2.8 | 3.4 | 5.9 | 6.9
Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,027.1 | 1,190.5 | 2,121.6 | 2,324.3
Northern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 988.7 | 1,159.1 | 2,045.9 | 2,266.9
Northern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 38.4 | 31.4 | 75.7 | 57.4
Northern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 900.2 | 1,067.6 | 1,877.3 | 2,086.4
Northern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 52.7 | 66.6 | 107.7 | 131.4
Northern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 47.0 | 36.1 | 92.3 | 65.6
Northern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 27.2 | 20.2 | 44.3 | 40.9
APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 603.7 | 619.9 | 1,221.9 | 1,247.3
APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 580.5 | 598.3 | 1,177.6 | 1,206.2
APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 23.2 | 21.6 | 44.3 | 41.1
APME | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 455.6 | 465.5 | 918.7 | 946.3
APME | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 98.8 | 102.1 | 208.1 | 200.5
APME | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 40.5 | 39.8 | 77.7 | 77.2
APME | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.8 | 12.5 | 17.4 | 23.3
Northern Europe and APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,094.9 | 5,277.1 | 10,252.7 | 10,201.5
Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,094.9 | 5,277.1 | 10,252.7 | 10,201.5
Reportable Segments | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,951.1 | 5,166.3 | 9,971.9 | 9,996.2
Reportable Segments | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 143.8 | 110.8 | 280.8 | 205.3
Reportable Segments | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,407.2 | 4,634.0 | 8,887.0 | 8,944.9
Reportable Segments | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 394.6 | 399.3 | 800.5 | 788.0
Reportable Segments | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 205.2 | 155.7 | 399.1 | 291.4
Reportable Segments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 87.9 | $ 88.1 | $ 166.1 | $ 177.2

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