Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | [1] | $ 4,856.1 | $ 5,074.1 | $ 9,608.4 | $ 10,217.4 | |
Intercompany Eliminations | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | (21.4) | (20.8) | (40.7) | (35.3) | |
Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | | | 65.2 | | |
Outcome-Based Solutions and Consulting | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | | | 113.2 | | $ 60.4 |
Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,098.7 | 1,262.7 | 2,228.9 | 2,513.9 | |
Americas | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,098.7 | 1,262.7 | 2,228.9 | 2,513.9 | |
Americas | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,071.8 | 1,221.7 | 2,173.1 | 2,435.5 | |
Americas | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 26.9 | 41 | 55.8 | 78.4 | |
Americas | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 736.7 | 903.9 | 1,506.7 | 1,793.3 | |
Americas | United States | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | [2] | 736.7 | 903.9 | 1,506.7 | 1,793.3 | |
Americas | United States | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 717.3 | 871 | 1,465.7 | 1,729.8 | |
Americas | United States | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 19.4 | 32.9 | 41 | 63.5 | |
Americas | Other Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 362 | 358.8 | 722.2 | 720.6 | |
Americas | Other Americas | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 362 | 358.8 | 722.2 | 720.6 | |
Americas | Other Americas | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 354.5 | 350.7 | 707.4 | 705.7 | |
Americas | Other Americas | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 7.5 | 8.1 | 14.8 | 14.9 | |
Americas | Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 994.5 | 1,135 | 2,017.2 | 2,264.6 | |
Americas | Staffing and Interim | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 658.2 | 803.1 | 1,345.3 | 1,595.8 | |
Americas | Staffing and Interim | Other Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 336.3 | 331.9 | 671.9 | 668.8 | |
Americas | Outcome-Based Solutions and Consulting | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 16.5 | 18 | 31.8 | 34.3 | |
Americas | Outcome-Based Solutions and Consulting | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 5 | 5.5 | 9.2 | 9.8 | |
Americas | Outcome-Based Solutions and Consulting | Other Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 11.5 | 12.5 | 22.6 | 24.5 | |
Americas | Permanent Recruitment | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 43.7 | 70.9 | 93.2 | 136.3 | |
Americas | Permanent Recruitment | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 32 | 58 | 69.8 | 112.2 | |
Americas | Permanent Recruitment | Other Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 11.7 | 12.9 | 23.4 | 24.1 | |
Americas | Other | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 44 | 38.8 | 86.7 | 78.7 | |
Americas | Other | United States | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 41.5 | 37.3 | 82.4 | 75.5 | |
Americas | Other | Other Americas | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 2.5 | 1.5 | 4.3 | 3.2 | |
Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 2,226.9 | 2,201.4 | 4,294.8 | 4,395.3 | |
Southern Europe | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 2,226.9 | 2,201.4 | 4,294.8 | 4,395.3 | |
Southern Europe | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 2,185.3 | 2,160.2 | 4,210.9 | 4,312.9 | |
Southern Europe | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 41.6 | 41.2 | 83.9 | 82.4 | |
Southern Europe | France | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,278.2 | 1,238.2 | 2,447.5 | 2,430.6 | |
Southern Europe | France | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,278.2 | 1,238.2 | 2,447.5 | 2,430.6 | |
Southern Europe | France | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,263.5 | 1,223.4 | 2,417.6 | 2,400.4 | |
Southern Europe | France | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 14.7 | 14.8 | 29.9 | 30.2 | |
Southern Europe | Italy | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 457.8 | 454.3 | 880 | 899.3 | |
Southern Europe | Italy | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 457.8 | 454.3 | 880 | 899.3 | |
Southern Europe | Italy | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 443.5 | 440.9 | 851.7 | 873.3 | |
Southern Europe | Italy | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 14.3 | 13.4 | 28.3 | 26 | |
Southern Europe | Other Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 490.9 | 508.9 | 967.3 | 1,065.4 | |
Southern Europe | Other Southern Europe | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 490.9 | 508.9 | 967.3 | 1,065.4 | |
Southern Europe | Other Southern Europe | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 478.3 | 495.9 | 941.6 | 1,039.2 | |
Southern Europe | Other Southern Europe | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 12.6 | 13 | 25.7 | 26.2 | |
Southern Europe | Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,989 | 1,976.8 | 3,816 | 3,939.6 | |
Southern Europe | Staffing and Interim | France | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 1,172.8 | 1,149.9 | 2,234.5 | 2,251.4 | |
Southern Europe | Staffing and Interim | Italy | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 425.6 | 423.9 | 818.3 | 841.7 | |
Southern Europe | Staffing and Interim | Other Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 390.6 | 403 | 763.2 | 846.5 | |
Southern Europe | Outcome-Based Solutions and Consulting | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 158.7 | 164.7 | 321.9 | 337.2 | |
Southern Europe | Outcome-Based Solutions and Consulting | France | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 71.2 | 68.3 | 144.4 | 138.6 | |
Southern Europe | Outcome-Based Solutions and Consulting | Italy | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 10.2 | 9.2 | 19.6 | 17.3 | |
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 77.3 | 87.2 | 157.9 | 181.3 | |
Southern Europe | Permanent Recruitment | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 47 | 46.8 | 94.4 | 92.8 | |
Southern Europe | Permanent Recruitment | France | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 16.2 | 16.4 | 32.7 | 32.9 | |
Southern Europe | Permanent Recruitment | Italy | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 15.3 | 14.5 | 30.3 | 28.2 | |
Southern Europe | Permanent Recruitment | Other Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 15.5 | 15.9 | 31.4 | 31.7 | |
Southern Europe | Other | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 32.2 | 13.1 | 62.5 | 25.7 | |
Southern Europe | Other | France | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 18 | 3.6 | 35.9 | 7.7 | |
Southern Europe | Other | Italy | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 6.7 | 6.7 | 11.8 | 12.1 | |
Southern Europe | Other | Other Southern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 7.5 | 2.8 | 14.8 | 5.9 | |
Northern Europe | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 952.5 | 1,027.1 | 1,920.1 | 2,121.6 | |
Northern Europe | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 952.5 | 1,027.1 | 1,920.1 | 2,121.6 | |
Northern Europe | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 921.3 | 988.7 | 1,854.4 | 2,045.9 | |
Northern Europe | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 31.2 | 38.4 | 65.7 | 75.7 | |
Northern Europe | Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 804.8 | 874 | 1,615.4 | 1,812.1 | $ 26.2 |
Northern Europe | Outcome-Based Solutions and Consulting | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 82.9 | 78.9 | 172.3 | 172.9 | |
Northern Europe | Permanent Recruitment | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 39.6 | 47 | 83 | 92.3 | |
Northern Europe | Other | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 25.2 | 27.2 | 49.4 | 44.3 | |
APME | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 599.4 | 603.7 | 1,205.3 | 1,221.9 | |
APME | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 599.4 | 603.7 | 1,205.3 | 1,221.9 | |
APME | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 578.4 | 580.5 | 1,163 | 1,177.6 | |
APME | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 21 | 23.2 | 42.3 | 44.3 | |
APME | Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 453.2 | 455.6 | 908.1 | 918.7 | |
APME | Outcome-Based Solutions and Consulting | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 97.5 | 98.8 | 198.4 | 208.1 | |
APME | Permanent Recruitment | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 36.5 | 40.5 | 75.5 | 77.7 | |
APME | Other | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 12.2 | 8.8 | 23.3 | 17.4 | |
Northern Europe and APME | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 4,877.5 | 5,094.9 | 9,649.1 | 10,252.7 | |
Northern Europe and APME | Reportable Subsegments [Member] | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 4,877.5 | 5,094.9 | 9,649.1 | 10,252.7 | |
Northern Europe and APME | Services transferred over time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 4,756.8 | 4,951.1 | 9,401.4 | 9,971.9 | |
Northern Europe and APME | Services transferred at a point in time | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 120.7 | 143.8 | 247.7 | 280.8 | |
Northern Europe and APME | Staffing and Interim | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 4,241.5 | 4,441.4 | 8,356.7 | 8,935 | |
Northern Europe and APME | Outcome-Based Solutions and Consulting | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 355.6 | 360.4 | 724.4 | 752.5 | |
Northern Europe and APME | Permanent Recruitment | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | 166.8 | 205.2 | 346.1 | 399.1 | |
Northern Europe and APME | Other | | | | | | |
Disaggregation of Revenue [Line Items] | | | | | | |
Revenue | | $ 113.6 | $ 87.9 | $ 221.9 | $ 166.1 | |
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[1] Our consolidated revenues from services include fees received from our franchise offices of $ 3.3 and $ 3.9 for the three months ended June 30, 2023 and 2022, respectively, and $ 7.2 and $ 7.5 for the six months ended June 30, 2023 and 2022, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $ 250.6 and $ 275.6 for the three months ended June 30, 2023 and 2022, respectively, and $ 500.8 and $ 540.8 for the six months ended June 30, 2023 and 2022 , respectively. In the United States, revenues from services included fees received from the related franchise offices of $ 2.6 and $ 3.1 for the three months ended June 30, 2023 and 2022, respectively, and $ 5.8 and $ 6.0 for the six months ended June 30, 2023 and 2022, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $ 100.8 and $ 128.1 for the three months ended June 30, 2023 and 2022, respectively, and $ 200.1 and $ 238.9 for the six months ended June 30, 2023 and 2022 , respectively. | |