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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | [1] | $ 18,914.5 | $ 19,827.5 | $ 20,724.4
Intercompany Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | (85.9) | (80.1) | (37.7)
Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 19,378.0 |
Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 445.7 | 529.6 |
Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 19,000.4 | 19,907.6 |
Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,308.6 | 4,787.2 |
Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 106.2 | 148.5 |
Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 2,961.6 | 3,499.3 |
Americas | United States | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 2,885.0 | 3,380.9 |
Americas | United States | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 76.6 | 118.4 |
Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,453.2 | 1,436.4 |
Americas | Other Americas | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,423.6 | 1,406.3 |
Americas | Other Americas | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 29.6 | 30.1 |
Americas | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,414.8 | 4,935.7 | 4,263.7
Americas | Reportable subsegments | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | [1] | 2,961.6 | 3,499.3 | 2,743.3
Americas | Reportable subsegments | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,453.2 | 1,436.4 | 1,520.4
Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 8,363.4 | 8,385.5 |
Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 151.9 | 150.8 |
Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,867.1 | 4,785.0 |
Southern Europe | France | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,814.5 | 4,732.3 |
Southern Europe | France | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 52.6 | 52.7 |
Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,708.8 | 1,706.9 |
Southern Europe | Italy | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,657.8 | 1,659.4 |
Southern Europe | Italy | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 51.0 | 47.5 |
Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,939.4 | 2,044.4 |
Southern Europe | Other Southern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,891.1 | 1,993.8 |
Southern Europe | Other Southern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 48.3 | 50.6 |
Southern Europe | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 8,515.3 | 8,536.3 | 9,346.8
Southern Europe | Reportable subsegments | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,867.1 | 4,785.0 | 5,171.3
Southern Europe | Reportable subsegments | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,708.8 | 1,706.9 | 1,795.4
Southern Europe | Reportable subsegments | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,939.4 | 2,044.4 | 2,380.1
Northern Europe | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 3,627.5 | 3,902.9 |
Northern Europe | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 120.5 | 145.4 |
Northern Europe | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 3,748.0 | 4,048.3 | 4,670.5
APME | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 2,255.2 | 2,302.4 |
APME | Services transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 67.1 | 84.9 |
APME | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 2,322.3 | 2,387.3 | 2,481.1
Northern Europe And APME | Reportable subsegments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 19,000.4 | 19,907.6 | $ 20,762.1
Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 18,554.7 |  |
Staffing and Interim |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 120.5 |  |
Staffing and Interim | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 3,995.1 | 4,444.4 |
Staffing and Interim | Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 2,647.7 | 3,115.1 |
Staffing and Interim | Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,347.4 | 1,329.3 |
Staffing and Interim | Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 7,592.0 | 7,657.5 |
Staffing and Interim | Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 4,454.7 | 4,421.8 |
Staffing and Interim | Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,590.1 | 1,600.7 |
Staffing and Interim | Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,547.2 | 1,635.0 |
Staffing and Interim | Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 3,160.2 | 3,446.9 |
Staffing and Interim | APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,781.8 | 1,809.6 |
Staffing and Interim | Northern Europe And APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 16,529.1 | 17,358.4 |
Outcome-Based Solutions and Consulting | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 252.6 |  |
Outcome-Based Solutions and Consulting | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 67.7 | 73.6 |
Outcome-Based Solutions and Consulting | Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 18.3 | 21.7 |
Outcome-Based Solutions and Consulting | Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 49.4 | 51.9 |
Outcome-Based Solutions and Consulting | Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 625.5 | 636.6 |
Outcome-Based Solutions and Consulting | Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 283.5 | 268.0 |
Outcome-Based Solutions and Consulting | Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 36.9 | 31.9 |
Outcome-Based Solutions and Consulting | Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 305.1 | 336.7 |
Outcome-Based Solutions and Consulting | Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 332.5 | 335.5 |
Outcome-Based Solutions and Consulting | APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 386.3 | 392.0 |
Outcome-Based Solutions and Consulting | Northern Europe And APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 1,412.0 | 1,437.7 |
Permanent Recruitment | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 179.9 | 257.6 |
Permanent Recruitment | Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 133.0 | 209.0 |
Permanent Recruitment | Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 46.9 | 48.6 |
Permanent Recruitment | Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 172.8 | 171.6 |
Permanent Recruitment | Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 58.9 | 57.9 |
Permanent Recruitment | Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 55.0 | 51.7 |
Permanent Recruitment | Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 58.9 | 62.0 |
Permanent Recruitment | Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 153.2 | 179.3 |
Permanent Recruitment | APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 109.4 | 149.1 |
Permanent Recruitment | Northern Europe And APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 615.3 | 757.6 |
Other | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 172.1 | 160.1 |
Other | Americas | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 162.6 | 153.5 |
Other | Americas | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 9.5 | 6.6 |
Other | Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 125.0 | 70.6 |
Other | Southern Europe | France |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 70.0 | 37.3 |
Other | Southern Europe | Italy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 26.8 | 22.6 |
Other | Southern Europe | Other Southern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 28.2 | 10.7 |
Other | Northern Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 102.1 | 86.6 |
Other | APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | 44.8 | 36.6 |
Other | Northern Europe And APME |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  | $ 444.0 | $ 353.9 |
[1] | (a) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $11.9, $12.8 and $12.8 for 2023, 2022, and 2021, respectively.

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