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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (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 | Jan. 01, 2022
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill | [2] |  |  |  | $ 1,586.8 | [1] | $ 1,628.1 | [1] | $ 1,722.2 |
Goodwill, accumulated impairment loss |  |  |  |  | 749.3 |  | 694.2 |  |  |
Impairment Charge |  | $ 0.0 | $ 0.0 | $ 0.0 | 55.1 | [2],[3] | 50.0 | [2],[3] | 0.0 |
Corporate |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill | [4] |  |  |  | 126.0 |  | 126.0 |  | 126.0 |
Goodwill, accumulated impairment loss |  |  |  |  | 278.2 |  | 278.2 |  |  |
Impairment Charge | [3],[4] |  |  |  | 0.0 |  | 0.0 |  |  |
Jefferson Wells |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 55.5 |  |  |  |  |
Right Management |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 62.1 |  |  |
Goodwill, accumulated impairment loss |  |  |  |  | 235.2 |  | 235.2 |  |  |
Netherlands Subsegment [Member] | Jefferson Wells |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 0.0 |  | 55.1 |  |  |
Americas | Reportable segments |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill | [5] |  |  |  | 1,050.4 |  | 1,049.6 |  | 1,058.9 |
Impairment Charge | [3],[5] |  |  |  | 0.0 |  | 0.0 |  |  |
Americas | United States |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,006.5 |  | 1,006.5 |  |  | $ 1,013.0
Americas | United States | Jefferson Wells |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,085.3 |  | 1,085.3 |  |  |
Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill | [6] |  |  |  | 154.7 |  | 148.2 |  | 146.7 |
Impairment Charge | [3],[6] |  |  |  | 0.0 |  | 0.0 |  |  |
Southern Europe | France |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 81.7 |  | 79.5 |  |  |
Southern Europe | France | Right Management |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 75.6 |  | 73.3 |  |  | 68.2
Southern Europe | Italy |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 3.8 |  | 3.7 |  |  | $ 3.9
Northern Europe |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill, accumulated impairment loss |  |  |  |  | 232.1 |  | 177.0 |  |  |
Northern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 188.0 |  | 234.8 |  | 313.7 |
Impairment Charge | [3] |  |  |  | 55.1 |  | 50.0 |  |  |
Northern Europe | Netherlands Subsegment [Member] |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  |  | 55.1 |  |  |  |  |
APME | Reportable segments |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 67.7 |  | 69.5 |  | $ 76.9 |
Goodwill, accumulated impairment loss |  |  |  |  | 3.8 |  | 3.8 |  |  |
Impairment Charge | [3] |  |  |  | $ 0.0 |  | $ 0.0 |  |  |
[1] | Balances were net of accumulated impairment loss of $749.3 and $694.2 as of December 31, 2023 and 2022, 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] | 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
[5] | 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.
[6] | 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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