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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenue $ 17,853.9 $ 18,914.5 [1] $ 19,827.5
Intercompany Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue (54.9) (85.9) [1] (80.1)
Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 17,539.0 18,554.7 [2]  
Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 369.8 445.7 [2]  
Other Southern Europe | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 1,880.6    
Other Southern Europe | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 42.3    
Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 17,853.9 18,914.5 19,827.5
Reportable subsegments | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 1,922.9    
Americas | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 4,127.4 8,363.4 [2]  
Americas | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 97.5 151.9 [2]  
Americas | United States      
Disaggregation of Revenue [Line Items]      
Revenue [2]   2,866.2  
Americas | United States | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 2,695.4 2,789.8 [2]  
Americas | United States | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 71.2 76.4 [2]  
Americas | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue [2]   1,548.6  
Americas | Other Americas | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 1,432.0 1,518.8 [2]  
Americas | Other Americas | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 26.3 29.8 [2]  
Americas | Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 4,224.9 4,414.8 [1],[3] 4,935.7 [4]
Americas | Reportable subsegments | United States      
Disaggregation of Revenue [Line Items]      
Revenue 2,766.6 [5] 2,866.2 [1],[3],[6] 3,368.1 [4],[7]
Americas | Reportable subsegments | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue 1,458.3 1,548.6 [1],[3] 1,567.6 [4]
Southern Europe | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 8,086.5 4,308.6 [2]  
Southern Europe | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 131.8 106.2 [2]  
Southern Europe | France      
Disaggregation of Revenue [Line Items]      
Revenue [2]   4,867.1  
Southern Europe | France | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 4,573.3 4,814.5 [2]  
Southern Europe | France | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 45.1 52.6 [2]  
Southern Europe | Italy      
Disaggregation of Revenue [Line Items]      
Revenue [2]   1,708.8  
Southern Europe | Italy | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 1,632.6 1,657.8 [2]  
Southern Europe | Italy | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 44.4 51.0 [2]  
Southern Europe | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue [2]   1,939.4  
Southern Europe | Other Southern Europe | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue [2]   1,891.1  
Southern Europe | Other Southern Europe | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue [2]   48.3  
Southern Europe | Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 8,218.3 8,515.3 [1] 8,536.3
Southern Europe | Reportable subsegments | France      
Disaggregation of Revenue [Line Items]      
Revenue 4,618.4 4,867.1 [1] 4,785.0
Southern Europe | Reportable subsegments | Italy      
Disaggregation of Revenue [Line Items]      
Revenue 1,677.0 1,708.8 [1] 1,706.9
Southern Europe | Reportable subsegments | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 1,922.9 1,939.4 [1] 2,044.4
Northern Europe | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 3,208.9 3,627.5 [2]  
Northern Europe | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 95.4 120.5 [2]  
Northern Europe | Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 3,304.3 3,748.0 [1] 4,048.3
APME | Services transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 2,116.2 2,255.2 [2]  
APME | Services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 45.1 67.1 [2]  
APME | Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 2,161.3 2,322.3 [1] 2,387.3
Northern Europe And APME | Reportable subsegments      
Disaggregation of Revenue [Line Items]      
Revenue 17,908.8 19,000.4 [1] $ 19,907.6
Staffing and Interim | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 3,805.1 3,995.1 [1]  
Staffing and Interim | Americas | United States      
Disaggregation of Revenue [Line Items]      
Revenue 2,454.5 2,552.5 [1]  
Staffing and Interim | Americas | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue 1,350.6 1,442.6 [1]  
Staffing and Interim | Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 7,311.4 7,592.0 [1]  
Staffing and Interim | Southern Europe | France      
Disaggregation of Revenue [Line Items]      
Revenue 4,205.4 4,454.7 [1]  
Staffing and Interim | Southern Europe | Italy      
Disaggregation of Revenue [Line Items]      
Revenue 1,561.5 1,590.1 [1]  
Staffing and Interim | Southern Europe | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 1,544.5 1,547.2 [1]  
Staffing and Interim | Northern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 2,814.0 3,160.2 [1]  
Staffing and Interim | APME      
Disaggregation of Revenue [Line Items]      
Revenue 1,746.1 1,781.8 [1]  
Staffing and Interim | Northern Europe And APME      
Disaggregation of Revenue [Line Items]      
Revenue 15,676.6 16,529.1 [1]  
Outcome-Based Solutions and Consulting | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 65.5 67.7 [1]  
Outcome-Based Solutions and Consulting | Americas | United States      
Disaggregation of Revenue [Line Items]      
Revenue 11.3 18.3 [1]  
Outcome-Based Solutions and Consulting | Americas | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue 54.2 49.4 [1]  
Outcome-Based Solutions and Consulting | Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 614.2 625.5 [1]  
Outcome-Based Solutions and Consulting | Southern Europe | France      
Disaggregation of Revenue [Line Items]      
Revenue 281.8 283.5 [1]  
Outcome-Based Solutions and Consulting | Southern Europe | Italy      
Disaggregation of Revenue [Line Items]      
Revenue 36.0 36.9 [1]  
Outcome-Based Solutions and Consulting | Southern Europe | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 296.4 305.1 [1]  
Outcome-Based Solutions and Consulting | Northern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 257.2 332.5 [1]  
Outcome-Based Solutions and Consulting | APME      
Disaggregation of Revenue [Line Items]      
Revenue 321.9 386.3 [1]  
Outcome-Based Solutions and Consulting | Northern Europe And APME      
Disaggregation of Revenue [Line Items]      
Revenue 1,258.8 1,412.0 [1]  
Permanent Recruitment | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 169.1 179.9 [1]  
Permanent Recruitment | Americas | United States      
Disaggregation of Revenue [Line Items]      
Revenue 126.1 132.7 [1]  
Permanent Recruitment | Americas | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue 43.0 47.2 [1]  
Permanent Recruitment | Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 148.2 172.8 [1]  
Permanent Recruitment | Southern Europe | France      
Disaggregation of Revenue [Line Items]      
Revenue 49.6 58.9 [1]  
Permanent Recruitment | Southern Europe | Italy      
Disaggregation of Revenue [Line Items]      
Revenue 48.0 55.0 [1]  
Permanent Recruitment | Southern Europe | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 50.6 58.9 [1]  
Permanent Recruitment | Northern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 121.5 153.2 [1]  
Permanent Recruitment | APME      
Disaggregation of Revenue [Line Items]      
Revenue 52.8 109.4 [1]  
Permanent Recruitment | Northern Europe And APME      
Disaggregation of Revenue [Line Items]      
Revenue 491.6 615.3 [1]  
Other | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 185.2 172.1 [1]  
Other | Americas | United States      
Disaggregation of Revenue [Line Items]      
Revenue 174.7 162.7 [1]  
Other | Americas | Other Americas      
Disaggregation of Revenue [Line Items]      
Revenue 10.5 9.4 [1]  
Other | Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 144.5 125.0 [1]  
Other | Southern Europe | France      
Disaggregation of Revenue [Line Items]      
Revenue 81.6 70.0 [1]  
Other | Southern Europe | Italy      
Disaggregation of Revenue [Line Items]      
Revenue 31.5 26.8 [1]  
Other | Southern Europe | Other Southern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 31.4 28.2 [1]  
Other | Northern Europe      
Disaggregation of Revenue [Line Items]      
Revenue 111.6 102.1 [1]  
Other | APME      
Disaggregation of Revenue [Line Items]      
Revenue 40.5 44.8 [1]  
Other | Northern Europe And APME      
Disaggregation of Revenue [Line Items]      
Revenue $ 481.8 $ 444.0 [1]  
[1] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.
[2] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.
[3] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.
[4] Effective January 1, 2024, our segment reporting was realigned to include our Puerto Rico business within Other Americas. Accordingly, United States is now adjusted to exclude Puerto Rico. All previously reported results have been restated to conform to the current year presentation.
[5] The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $10.7 for 2024.
[6] The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $11.9 for 2023.
[7] The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $12.8 for 2022.