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Segment Data - Schedule of Segment Data (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services | [1] |  |  |  | $ 19,827.5 |  | $ 20,724.4 | $ 18,001.0
Corporate expenses |  |  |  |  | (157.0) |  | (154.3) | (113.9)
Goodwill Impairment charge |  | $ 0.0 | $ 0.0 | $ 0.0 | (50.0) | [2],[3] | 0.0 | (66.8)
Intangible asset amortization expense | [4] |  |  |  | (37.1) |  | (24.2) | (27.2)
Operating profit |  |  |  |  | 581.7 |  | 585.4 | 187.6
Interest and other expenses, net |  |  |  |  | (24.6) |  | (17.3) | (39.9)
Earnings before income taxes |  |  |  |  | 557.1 |  | 568.1 | 147.7
Depreciation and Amortization Expense |  |  |  |  | 84.6 |  | 73.4 | 76.3
Total Assets |  |  |  |  | 9,130.4 |  | 9,828.9 | 9,328.2
Equity Investments |  |  |  |  | 95.8 |  | 114.2 |
Additions to Long-Lived Assets |  |  |  |  | 525.6 |  | 528.4 | 555.0
Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 1.6 |  | 0.7 | 0.1
Corporate |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |
Total Assets | [5] |  |  |  | 444.1 |  | 396.6 | 503.2
Additions to Long-Lived Assets |  |  |  |  | 9.0 |  | 14.0 | 6.5
Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense | [6] |  |  |  | 37.1 |  | 24.2 | 27.2
Intercompany Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | (80.1) |  | (37.7) |
Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,935.7 |  | 4,263.7 | 3,792.4
Operating Unit Profit (Loss) |  |  |  |  | 282.6 |  | 195.2 | 116.0
Depreciation and Amortization Expense |  |  |  |  | 10.0 |  | 9.3 | 10.1
Total Assets |  |  |  |  | 3,640.6 |  | 3,831.6 | 2,485.1
Additions to Long-Lived Assets |  |  |  |  | 93.8 |  | 93.2 | 93.5
Americas | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |
Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 8,536.3 |  | 9,346.8 | 7,855.2
Operating Unit Profit (Loss) |  |  |  |  | 413.0 |  | 416.3 | 237.0
Depreciation and Amortization Expense |  |  |  |  | 17.7 |  | 20.0 | 21.8
Total Assets |  |  |  |  | 3,558.4 |  | 3,691.2 | 4,167.2
Additions to Long-Lived Assets |  |  |  |  | 253.5 |  | 237.3 | 251.8
Southern Europe | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |
Northern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,048.3 |  | 4,670.5 |
Operating Unit Profit (Loss) |  |  |  |  | 42.4 |  | 67.8 | (27.6)
Northern Europe | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill Impairment charge | [3] |  |  |  | (50.0) |  |  |
Depreciation and Amortization Expense |  |  |  |  | 10.7 |  | 10.9 | 8.9
Total Assets |  |  |  |  | 742.9 |  | 1,095.7 | 1,366.7
Northern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  | 116.5 |  | 106.6 | 127.1
APME |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 2,387.3 |  | 2,481.1 | 2,376.7
Operating Unit Profit (Loss) |  |  |  |  | 87.8 |  | 84.6 | 70.1
APME | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 7.5 |  | 8.3 | 8.2
Total Assets |  |  |  |  | 744.4 |  | 813.8 | 806.0
Additions to Long-Lived Assets |  |  |  |  | 52.8 |  | 77.3 | 76.1
Northern Europe And APME |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 19,907.6 |  | 20,762.1 | 18,001.0
Operating Unit Profit (Loss) |  |  |  |  | 825.8 |  | 763.9 | 395.5
United States | Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 3,499.3 |  | 2,743.3 |
United States | Americas | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 7.8 |  | 6.9 | 7.8
Total Assets |  |  |  |  | 3,243.2 |  | 3,434.6 | 2,103.8
United States | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  | 79.2 |  | 76.9 | 73.9
Other Americas | Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,436.4 |  | 1,520.4 |
Other Americas | Americas | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 2.2 |  | 2.4 | 2.3
Total Assets |  |  |  |  | 397.4 |  | 397.0 | 381.3
Other Americas | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  | 14.6 |  | 16.3 | 19.6
France | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,785.0 |  | 5,171.3 |
France | Southern Europe | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 10.5 |  | 12.5 | 14.4
Total Assets |  |  |  |  | 2,281.9 |  | 2,353.3 | 2,778.3
Additions to Long-Lived Assets |  |  |  |  | 160.7 |  | 135.0 | 147.8
Italy | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,706.9 |  | 1,795.4 |
Italy | Southern Europe | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  | 2.4 |  | 2.5 | 2.1
Total Assets |  |  |  |  | 455.3 |  | 509.7 | 540.4
Additions to Long-Lived Assets |  |  |  |  | 32.7 |  | 33.6 | 36.0
Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 2,044.4 |  | 2,380.1 |
Earnings from Equity Investments |  |  |  |  | 4.8 |  | 5.0 | 5.3
Other Southern Europe | Southern Europe | Reportable segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total Assets |  |  |  |  | 821.2 |  | 828.2 | 848.5
Other Southern Europe | Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  | 60.1 |  | 68.7 | 68.0
Reportable subsegments | Intercompany Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  | 37.7 | 0.0
Reportable subsegments | Northern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,048.3 |  | 4,670.5 | 3,976.7
Reportable subsegments | United States | Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services | [1] |  |  |  | 3,499.3 |  | 2,743.3 | 2,327.2
Operating Unit Profit (Loss) |  |  |  |  | 219.2 |  | 136.0 | 60.9
Reportable subsegments | Other Americas | Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,436.4 |  | 1,520.4 | 1,465.2
Operating Unit Profit (Loss) |  |  |  |  | 63.4 |  | 59.2 | 55.1
Reportable subsegments | France | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 4,785.0 |  | 5,171.3 | 4,338.1
Operating Unit Profit (Loss) |  |  |  |  | 226.7 |  | 233.5 | 149.0
Reportable subsegments | Italy | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 1,706.9 |  | 1,795.4 | 1,370.7
Operating Unit Profit (Loss) |  |  |  |  | 122.9 |  | 115.3 | 64.2
Reportable subsegments | Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  | 2,044.4 |  | 2,380.1 | 2,146.4
Operating Unit Profit (Loss) |  |  |  |  | $ 63.4 |  | $ 67.5 | $ 23.8
[1] | (a) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $12.8, $12.8 and $12.6 for 2022, 2021 and 2020, respectively.
[2] | Balances were net of accumulated impairment loss of $644.2 ($127.0 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to corporate) as of both January 1, 2021 and December 31, 2021; and $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.
[3] | The 2022 impairment charge of $50.0 relates to our Netherlands reporting unit, which was recorded during the fourth quarter of 2022. 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] | (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.
[6] | (a) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.

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