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Segment Data - Schedule of Segment Data (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services | [1] |  |  |  | $ 18,914.5 |  | $ 19,827.5 |  | $ 20,724.4
Corporate expenses |  |  |  |  | (153.7) |  | (157.0) |  | (154.3)
Goodwill impairment charges |  | $ 0.0 | $ 0.0 | $ 0.0 | (55.1) | [2],[3] | (50.0) | [2],[3] | 0.0
Intangible asset amortization expense | [4] |  |  |  | (34.6) |  | (37.1) |  | (24.2)
Operating profit |  |  |  |  | 255.8 |  | 581.7 |  | 585.4
Interest and other expenses, net |  |  |  |  | (49.9) |  | (24.6) |  | (17.3)
Earnings before income taxes |  |  |  |  | 205.9 |  | 557.1 |  | 568.1
Depreciation and amortization expense |  |  |  |  | 88.6 |  | 84.6 |  | 73.4
Total assets |  |  |  |  | 8,830.2 |  | 9,130.4 |  | 9,828.9
Additions to long-lived assets |  |  |  |  | 588.6 |  | 525.6 |  | 528.4
Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 2.8 |  | 1.6 |  | 0.7
Corporate |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charges | [3],[5] |  |  |  | 0.0 |  | 0.0 |  |
Total assets | [6] |  |  |  | 495.6 |  | 444.1 |  | 396.6
Additions to long-lived assets |  |  |  |  | 10.7 |  | 9.0 |  | 14.0
Segment Reconciling Items |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense | [7] |  |  |  | 34.6 |  | 37.1 |  | 24.2
Intercompany Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | (85.9) |  | (80.1) |  | (37.7)
Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating unit profit (loss) |  |  |  |  | 165.6 |  | 282.6 |  | 195.2
Depreciation and amortization expense |  |  |  |  | 11.7 |  | 10.0 |  | 9.3
Total assets |  |  |  |  | 3,488.2 |  | 3,640.6 |  | 3,831.6
Additions to long-lived assets |  |  |  |  | 104.4 |  | 93.8 |  | 93.2
Americas | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charges | [3],[8] |  |  |  | 0.0 |  | 0.0 |  |
Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating unit profit (loss) |  |  |  |  | 357.7 |  | 413.0 |  | 416.3
Depreciation and amortization expense |  |  |  |  | 19.3 |  | 17.7 |  | 20.0
Total assets |  |  |  |  | 3,541.0 |  | 3,558.4 |  | 3,691.2
Additions to long-lived assets |  |  |  |  | 289.4 |  | 253.5 |  | 237.3
Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charges | [3],[9] |  |  |  | 0.0 |  | 0.0 |  |
Northern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating unit profit (loss) |  |  |  |  | 116.7 |  | 42.4 |  | 67.8
Northern Europe | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charges | [3] |  |  |  | (55.1) |  | (50.0) |  |
Depreciation and amortization expense |  |  |  |  | 13.9 |  | 10.7 |  | 10.9
Total assets |  |  |  |  | 586.3 |  | 742.9 |  | 1,095.7
Northern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Additions to long-lived assets |  |  |  |  | 138.0 |  | 116.5 |  | 106.6
APME |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating unit profit (loss) |  |  |  |  | 92.6 |  | 87.8 |  | 84.6
APME | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charges | [3] |  |  |  | 0.0 |  | 0.0 |  |
Depreciation and amortization expense |  |  |  |  | 6.3 |  | 7.5 |  | 8.3
Total assets |  |  |  |  | 719.1 |  | 744.4 |  | 813.8
Additions to long-lived assets |  |  |  |  | 46.1 |  | 52.8 |  | 77.3
Northern Europe And APME |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating unit profit (loss) |  |  |  |  | 499.2 |  | 825.8 |  | 763.9
United States | Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 2,961.6 |  | 3,499.3 |  |
United States | Americas | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 9.5 |  | 7.8 |  | 6.9
Total assets |  |  |  |  | 3,054.8 |  | 3,243.2 |  | 3,434.6
United States | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Additions to long-lived assets |  |  |  |  | 87.9 |  | 79.2 |  | 76.9
Other Americas | Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,453.2 |  | 1,436.4 |  |
Other Americas | Americas | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 2.2 |  | 2.2 |  | 2.4
Total assets |  |  |  |  | 433.4 |  | 397.4 |  | 397.0
Other Americas | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Additions to long-lived assets |  |  |  |  | 16.5 |  | 14.6 |  | 16.3
France | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,867.1 |  | 4,785.0 |  |
France | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 12.7 |  | 10.5 |  | 12.5
Total assets |  |  |  |  | 2,253.6 |  | 2,281.9 |  | 2,353.3
Additions to long-lived assets |  |  |  |  | 182.9 |  | 160.7 |  | 135.0
Italy | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,708.8 |  | 1,706.9 |  |
Italy | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  | 2.2 |  | 2.4 |  | 2.5
Total assets |  |  |  |  | 487.0 |  | 455.3 |  | 509.7
Additions to long-lived assets |  |  |  |  | 50.6 |  | 32.7 |  | 33.6
Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,939.4 |  | 2,044.4 |  |
Earnings from equity investments |  |  |  |  | 4.4 |  | 4.8 |  | 5.0
Other Southern Europe | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  | 800.4 |  | 821.2 |  | 828.2
Other Southern Europe | Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Additions to long-lived assets |  |  |  |  | 55.9 |  | 60.1 |  | 68.7
Reportable subsegments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 19,000.4 |  | 19,907.6 |  |
Reportable subsegments | Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,414.8 |  | 4,935.7 |  | 4,263.7
Reportable subsegments | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 8,515.3 |  | 8,536.3 |  | 9,346.8
Reportable subsegments | Northern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 3,748.0 |  | 4,048.3 |  | 4,670.5
Reportable subsegments | APME |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 2,322.3 |  | 2,387.3 |  | 2,481.1
Reportable subsegments | Northern Europe And APME |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 19,000.4 |  | 19,907.6 |  | 20,762.1
Reportable subsegments | United States | Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services | [1] |  |  |  | 2,961.6 |  | 3,499.3 |  | 2,743.3
Operating unit profit (loss) |  |  |  |  | 100.4 |  | 219.2 |  | 136.0
Reportable subsegments | Other Americas | Americas |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,453.2 |  | 1,436.4 |  | 1,520.4
Operating unit profit (loss) |  |  |  |  | 65.2 |  | 63.4 |  | 59.2
Reportable subsegments | France | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,867.1 |  | 4,785.0 |  | 5,171.3
Operating unit profit (loss) |  |  |  |  | 188.3 |  | 226.7 |  | 233.5
Reportable subsegments | Italy | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,708.8 |  | 1,706.9 |  | 1,795.4
Operating unit profit (loss) |  |  |  |  | 124.7 |  | 122.9 |  | 115.3
Reportable subsegments | Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,939.4 |  | 2,044.4 |  | 2,380.1
Operating unit profit (loss) |  |  |  |  | $ 44.7 |  | $ 63.4 |  | $ 67.5
[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.
[2] | Balances were net of accumulated impairment loss of $694.2 ($177.0 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2022; and $749.3 ($232.1 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2023.
[3] | The impairment charges relate to our Netherlands reporting unit, which was recorded during the fourth quarter of 2022 and 2023, respectively. See Note 1 to the Consolidated Financial Statements for further information.
[4] | (b) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[5] | The majority of the Corporate balance as of December 31, 2022 and 2023 relates to goodwill attributable to our acquisitions of Right Management ($62.1) and Jefferson Wells ($55.5). Jefferson Wells is part of the United States reporting unit. Right Management is allocated to the reporting units of the countries in which Right Management operates. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments as this is commensurate with how we operate our business. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See table below for the breakout of goodwill balances by reporting unit
[6] | (a) Corporate assets include assets that were not used in the operations of any segment, the most significant of which were purchased intangibles and cash.
[7] | (a) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[8] | Balances related to United States were $1,013.0, $1,006.5 and $1,006.5 as of January 1, 2022, December 31, 2022 and December 31, 2023, respectively. The 2022 reduction for acquisitions represents post-closing opening balance adjustments related to the Experis acquisition.
[9] | Balances related to France were $68.2, $73.3 and $75.6 as of January 1, 2022, December 31, 2022 and December 31, 2023, respectively. Balances related to Italy were $3.9, $3.7 and $3.8 as of January 1, 2022, December 31, 2022 and December 31, 2023, respectively.

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