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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,090.3 |  | $ 4,403.3 | [1]
Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,090.3 |  | 4,403.3 |
Intercompany Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (7.6) |  | (19.8) | [1]
United States | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 688.8 |  | 680.4 | [1]
Other Americas | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 367.9 |  | 356.0 | [1]
Americas | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,056.7 |  | 1,036.4 | [1]
Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,037.4 |  | 1,010.8 | [2]
Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 19.3 |  | 25.6 | [2]
Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 688.8 |  | 680.4 | [2]
Americas | United States | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 688.8 | [3] | 680.4 | [4]
Americas | United States | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 673.6 |  | 662.7 | [2]
Americas | United States | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15.2 |  | 17.7 | [2]
Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 367.9 |  | 356.0 | [2]
Americas | Other Americas | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 367.9 |  | 356.0 |
Americas | Other Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 363.8 |  | 348.1 | [2]
Americas | Other Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4.1 |  | 7.9 | [2]
Americas | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 958.3 |  | 935.0 | [1]
Americas | Staffing and Interim | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 616.1 |  | 604.4 | [1]
Americas | Staffing and Interim | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 342.2 |  | 330.6 | [1]
Americas | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17.1 |  | 14.1 | [1]
Americas | Outcome-Based Solutions and Consulting | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2.3 |  | 3.0 | [1]
Americas | Outcome-Based Solutions and Consulting | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14.8 |  | 11.1 | [1]
Americas | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37.6 |  | 42.4 | [1]
Americas | Permanent Recruitment | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 29.3 |  | 30.6 | [1]
Americas | Permanent Recruitment | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.3 |  | 11.8 | [1]
Americas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 43.7 |  | 44.9 | [1]
Americas | Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 41.1 |  | 42.4 | [1]
Americas | Other | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2.6 |  | 2.5 | [1]
Southern Europe | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,834.0 |  | 1,981.3 | [1]
Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,801.4 |  | 1,943.4 | [2]
Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 32.6 |  | 37.9 | [2]
Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 965.7 |  | 1,099.3 | [2]
Southern Europe | France | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 965.7 |  | 1,099.3 | [1]
Southern Europe | France | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 955.1 |  | 1,085.7 | [2]
Southern Europe | France | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10.6 |  | 13.6 | [2]
Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 397.8 |  | 404.3 | [2]
Southern Europe | Italy | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 397.8 |  | 404.3 | [1]
Southern Europe | Italy | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 386.6 |  | 391.6 | [2]
Southern Europe | Italy | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.2 |  | 12.7 | [2]
Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 470.5 |  | 477.7 | [2]
Southern Europe | Other Southern Europe | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 470.5 |  | 477.7 | [1]
Southern Europe | Other Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 459.7 |  | 466.1 | [2]
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10.8 |  | 11.6 | [2]
Southern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,611.8 |  | 1,751.5 | [1]
Southern Europe | Staffing and Interim | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 871.6 |  | 997.7 | [1]
Southern Europe | Staffing and Interim | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 368.8 |  | 376.1 | [1]
Southern Europe | Staffing and Interim | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 371.4 |  | 377.7 | [1]
Southern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 151.2 |  | 153.9 | [1]
Southern Europe | Outcome-Based Solutions and Consulting | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 64.0 |  | 66.8 | [1]
Southern Europe | Outcome-Based Solutions and Consulting | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.1 |  | 8.1 | [1]
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 76.1 |  | 79.0 | [1]
Southern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37.0 |  | 42.2 | [1]
Southern Europe | Permanent Recruitment | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.3 |  | 14.9 | [1]
Southern Europe | Permanent Recruitment | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12.0 |  | 13.6 | [1]
Southern Europe | Permanent Recruitment | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13.7 |  | 13.7 | [1]
Southern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 34.0 |  | 33.7 | [1]
Southern Europe | Other | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18.8 |  | 19.9 | [1]
Southern Europe | Other | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5.9 |  | 6.5 | [1]
Southern Europe | Other | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.3 |  | 7.3 | [1]
Northern Europe | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 730.8 |  | 870.3 | [1]
Northern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 710.3 |  | 843.5 | [2]
Northern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 20.5 |  | 26.8 | [2]
Northern Europe | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 621.0 |  | 738.1 | [1]
Northern Europe | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 58.7 |  | 72.9 | [1]
Northern Europe | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 26.7 |  | 33.8 | [1]
Northern Europe | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24.4 |  | 25.5 | [1]
APME | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 476.4 |  | 535.1 | [1]
APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 466.8 |  | 524.5 | [2]
APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9.6 |  | 10.6 | [2]
APME | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 396.0 |  | 426.2 | [1]
APME | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 60.5 |  | 86.1 | [1]
APME | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11.3 |  | 12.6 | [1]
APME | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8.6 |  | 10.2 | [1]
Northern Europe and APME | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,097.9 |  | 4,423.1 | [1]
Northern Europe and APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,015.9 |  | 4,322.2 | [2]
Northern Europe and APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 82.0 |  | 100.9 | [2]
Northern Europe and APME | Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,587.1 |  | 3,850.8 | [1]
Northern Europe and APME | Outcome-Based Solutions and Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 287.5 |  | 327.0 | [1]
Northern Europe and APME | Permanent Recruitment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 112.6 |  | 131.0 | [1]
Northern Europe and APME | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 110.7 |  | $ 114.3 | [1]
[1] | Effective January 1, 2025, our segment reporting was realigned to include our Morocco business within Other Southern Europe. Accordingly, France is now adjusted to exclude Morocco. All previously reported results have been recast to conform to the current year presentation.
[2] | Effective January 1, 2025, our segment reporting was realigned to include our Morocco business within Other Southern Europe. Accordingly, France is now adjusted to exclude Morocco. All previously reported results have been recast to conform to the current year presentation.
[3] | The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $2.2 for the three months ended March 31, 2025.
[4] | The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $2.4 for the three months ended March 31, 2024.

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