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Revenue Recognition - Disaggregation of Revenue (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | [1] | Sep. 30, 2022 | [1] | Sep. 30, 2023 | Sep. 30, 2022 | [3] | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue | [2] | $ 4,675.6 | $ 4,800.9 | $ 14,284.0 | [3] | $ 15,018.3 |
Outcome-Based Solutions and Consulting | United States |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue |  |  |  | 171.6 |  |  | $ 58.4
Staffing and Interim |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue |  |  |  | 90.0 |  |  |
Northern Europe | Outcome-Based Solutions and Consulting |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue |  | 78.4 | 76.1 | 250.7 | [3] | 249.0 |
Northern Europe | Staffing and Interim |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 773.8 | $ 815.3 | $ 2,389.2 | [3] | $ 2,627.4 | $ 24.8
[1] | Certain service line revenues for the United States and Northern Europe were reclassified for the 2022 comparative period to align with the current period presentation. In the United States, $58.4 was reclassified from Outcome-Based Solutions and Consulting to Staffing and Interim. In Northern Europe, $24.8 was reclassified from Staffing and Interim to Outcome-Based Solutions and Consulting.
[2] | Our consolidated revenues from services include fees received from our franchise offices of $3.8 and $4.4 for the three months ended September 30, 2023 and 2022, respectively, and $11.0 and $11.9 for the nine months ended September 30, 2023 and 2022, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $243.5 and $264.0 for the three months ended September 30, 2023 and 2022, respectively, and $744.3 and $804.8 for the nine months ended September 30, 2023 and 2022, respectively.
[3] | Certain service line revenues for the United States and Northern Europe were reclassified for the 2022 comparative period to align with the current period presentation. In the United States, $171.6 was reclassified from Outcome-Based Solutions and Consulting to Staffing and Interim. In Northern Europe, $90.0 was reclassified from Staffing and Interim to Outcome-Based Solutions and Consulting.

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