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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Revenue [1] $ 4,403.3 $ 4,752.3 [2],[3]
Intercompany Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue (19.8) (19.3) [2],[3]
Americas | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 1,036.4 1,130.2 [2],[3]
Americas | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 1,010.8 1,101.3 [3]
Americas | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 25.6 28.9 [3]
Americas | United States    
Disaggregation of Revenue [Line Items]    
Revenue 680.4 741.6 [3]
Americas | United States | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue [4] 680.4 741.6 [2]
Americas | United States | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 662.7 720.1 [3]
Americas | United States | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 17.7 21.5 [3]
Americas | Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue 356.0 388.6 [3]
Americas | Other Americas | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 356.0 388.6 [2]
Americas | Other Americas | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 348.1 381.2 [3]
Americas | Other Americas | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 7.9 7.4 [3]
Americas | Staffing and Interim    
Disaggregation of Revenue [Line Items]    
Revenue 935.0 1,022.7 [2]
Americas | Staffing and Interim | United States    
Disaggregation of Revenue [Line Items]    
Revenue 604.4 658.8 [2]
Americas | Staffing and Interim | Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue 330.6 363.9 [2]
Americas | Outcome-Based Solutions and Consulting    
Disaggregation of Revenue [Line Items]    
Revenue 14.1 15.3 [2]
Americas | Outcome-Based Solutions and Consulting | United States    
Disaggregation of Revenue [Line Items]    
Revenue 3.0 4.2 [2]
Americas | Outcome-Based Solutions and Consulting | Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue 11.1 11.1 [2]
Americas | Permanent Recruitment    
Disaggregation of Revenue [Line Items]    
Revenue 42.4 49.5 [2]
Americas | Permanent Recruitment | United States    
Disaggregation of Revenue [Line Items]    
Revenue 30.6 37.7 [2]
Americas | Permanent Recruitment | Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue 11.8 11.8 [2]
Americas | Other    
Disaggregation of Revenue [Line Items]    
Revenue 44.9 42.7 [2]
Americas | Other | United States    
Disaggregation of Revenue [Line Items]    
Revenue 42.4 40.9 [2]
Americas | Other | Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue 2.5 1.8 [2]
Southern Europe | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 1,981.3 2,067.9 [2],[3]
Southern Europe | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 1,943.4 2,025.6 [3]
Southern Europe | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 37.9 42.3 [3]
Southern Europe | France    
Disaggregation of Revenue [Line Items]    
Revenue 1,119.3 1,169.3 [3]
Southern Europe | France | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 1,119.3 1,169.3 [2]
Southern Europe | France | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 1,105.7 1,154.1 [3]
Southern Europe | France | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 13.6 15.2 [3]
Southern Europe | Italy    
Disaggregation of Revenue [Line Items]    
Revenue 404.3 422.2 [3]
Southern Europe | Italy | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 404.3 422.2 [2]
Southern Europe | Italy | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 391.6 408.2 [3]
Southern Europe | Italy | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 12.7 14.0 [3]
Southern Europe | Other Southern Europe    
Disaggregation of Revenue [Line Items]    
Revenue 457.7 476.4 [3]
Southern Europe | Other Southern Europe | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 457.7 476.4 [2]
Southern Europe | Other Southern Europe | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 446.1 463.3 [3]
Southern Europe | Other Southern Europe | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 11.6 13.1 [3]
Southern Europe | Staffing and Interim    
Disaggregation of Revenue [Line Items]    
Revenue 1,751.5 1,827.0 [2]
Southern Europe | Staffing and Interim | France    
Disaggregation of Revenue [Line Items]    
Revenue 1,013.3 1,061.7 [2]
Southern Europe | Staffing and Interim | Italy    
Disaggregation of Revenue [Line Items]    
Revenue 376.1 392.7 [2]
Southern Europe | Staffing and Interim | Other Southern Europe    
Disaggregation of Revenue [Line Items]    
Revenue 362.1 372.6 [2]
Southern Europe | Outcome-Based Solutions and Consulting    
Disaggregation of Revenue [Line Items]    
Revenue 153.9 163.2 [2]
Southern Europe | Outcome-Based Solutions and Consulting | France    
Disaggregation of Revenue [Line Items]    
Revenue 71.1 73.2 [2]
Southern Europe | Outcome-Based Solutions and Consulting | Italy    
Disaggregation of Revenue [Line Items]    
Revenue 8.1 9.4 [2]
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe    
Disaggregation of Revenue [Line Items]    
Revenue 74.7 80.6 [2]
Southern Europe | Permanent Recruitment    
Disaggregation of Revenue [Line Items]    
Revenue 42.2 47.4 [2]
Southern Europe | Permanent Recruitment | France    
Disaggregation of Revenue [Line Items]    
Revenue 14.9 16.5 [2]
Southern Europe | Permanent Recruitment | Italy    
Disaggregation of Revenue [Line Items]    
Revenue 13.6 15.0 [2]
Southern Europe | Permanent Recruitment | Other Southern Europe    
Disaggregation of Revenue [Line Items]    
Revenue 13.7 15.9 [2]
Southern Europe | Other    
Disaggregation of Revenue [Line Items]    
Revenue 33.7 30.3 [2]
Southern Europe | Other | France    
Disaggregation of Revenue [Line Items]    
Revenue 20.0 17.9 [2]
Southern Europe | Other | Italy    
Disaggregation of Revenue [Line Items]    
Revenue 6.5 5.1 [2]
Southern Europe | Other | Other Southern Europe    
Disaggregation of Revenue [Line Items]    
Revenue 7.2 7.3 [2]
Northern Europe | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 870.3 967.6 [2],[3]
Northern Europe | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 843.5 933.1 [3]
Northern Europe | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 26.8 34.5 [3]
Northern Europe | Staffing and Interim    
Disaggregation of Revenue [Line Items]    
Revenue 738.1 810.6 [2]
Northern Europe | Outcome-Based Solutions and Consulting    
Disaggregation of Revenue [Line Items]    
Revenue 72.9 89.4 [2]
Northern Europe | Permanent Recruitment    
Disaggregation of Revenue [Line Items]    
Revenue 33.8 43.4 [2]
Northern Europe | Other    
Disaggregation of Revenue [Line Items]    
Revenue 25.5 24.2 [2]
APME | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 535.1 605.9 [2],[3]
APME | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 524.5 584.6 [3]
APME | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 10.6 21.3 [3]
APME | Staffing and Interim    
Disaggregation of Revenue [Line Items]    
Revenue 426.2 454.9 [2]
APME | Outcome-Based Solutions and Consulting    
Disaggregation of Revenue [Line Items]    
Revenue 86.1 100.9 [2]
APME | Permanent Recruitment    
Disaggregation of Revenue [Line Items]    
Revenue 12.6 39.0 [2]
APME | Other    
Disaggregation of Revenue [Line Items]    
Revenue 10.2 11.1 [2]
Northern Europe and APME | Reportable subsegments    
Disaggregation of Revenue [Line Items]    
Revenue 4,423.1 4,771.6 [2],[3]
Northern Europe and APME | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 4,322.2 4,644.6 [3]
Northern Europe and APME | Services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 100.9 127.0 [3]
Northern Europe and APME | Staffing and Interim    
Disaggregation of Revenue [Line Items]    
Revenue 3,850.8 4,115.2 [2]
Northern Europe and APME | Outcome-Based Solutions and Consulting    
Disaggregation of Revenue [Line Items]    
Revenue 327.0 368.8 [2]
Northern Europe and APME | Permanent Recruitment    
Disaggregation of Revenue [Line Items]    
Revenue 131.0 179.3 [2]
Northern Europe and APME | Other    
Disaggregation of Revenue [Line Items]    
Revenue $ 114.3 $ 108.3 [2]
[1] Our consolidated revenues from services include fees received from our franchise offices of $3.3 and $3.9 for the three months ended March 31, 2024 and 2023, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $277.2 and $250.2 for the three months ended March 31, 2024 and 2023, respectively.
[2]

(a) 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] In the United States, revenues from services included fees received from the related franchise offices of $2.4 and $3.2 for the three months ended March 31, 2024 and 2023, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $87.4 and $99.3 for the three months ended March 31, 2024 and 2023, respectively.