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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 1,563.4 | [1],[2] | $ 1,586.8 |  |
Acquisitions |  | 0.9 |  | 1.4 |  |
Dispositions |  | (0.7) |  |  |  |
Goodwill impairment charges |  | (88.7) | [3] | 0.0 |  | $ (55.1)
Impairment Charges | [4] | (58.1) |  |  |  |
Currency impact |  | 39.1 |  | (24.8) |  |
Balance at end of period |  | 1,544.6 | [1],[2] | 1,563.4 | [1],[2] | 1,586.8
Reportable segments | Americas |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [5] | 1,048.2 | [1] | 1,050.4 |  |
Acquisitions | [5] | 0.0 |  | 1.4 |  |
Dispositions | [5] | 0.0 |  |  |  |
Impairment Charges | [4],[5] | 0.0 |  |  |  |
Currency impact | [5] | 2.2 |  | (3.6) |  |
Balance at end of period | [5] | 1,050.4 | [1] | 1,048.2 | [1] | 1,050.4
Reportable segments | Southern Europe |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [6] | 145.3 | [1] | 154.7 |  |
Acquisitions | [6] | 0.0 |  | 0.0 |  |
Dispositions | [6] | 0.0 |  |  |  |
Impairment Charges | [4],[6] | (24.7) |  |  |  |
Currency impact | [6] | 19.3 |  | (9.4) |  |
Balance at end of period | [6] | 139.9 | [1] | 145.3 | [1] | 154.7
Reportable segments | Northern Europe |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 181.4 | [1] | 188.0 |  |
Acquisitions |  | 0.0 |  | 0.0 |  |
Dispositions |  | (0.7) |  |  |  |
Impairment Charges | [4] | (33.4) |  |  |  |
Currency impact |  | 17.4 |  | (6.6) |  |
Balance at end of period |  | 164.7 | [1] | 181.4 | [1] | 188.0
Reportable segments | APME |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 63.0 | [1] | 67.7 |  |
Acquisitions |  | 0.9 |  | 0.0 |  |
Dispositions |  | 0.0 |  |  |  |
Impairment Charges | [4] | 0.0 |  |  |  |
Currency impact |  | 0.2 |  | (4.7) |  |
Balance at end of period |  | 64.1 | [1] | 63.0 | [1] | 67.7
Corporate |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [7] | 125.5 | [1] | 126.0 |  |
Acquisitions | [7] | 0.0 |  | 0.0 |  |
Dispositions | [7] | 0.0 |  |  |  |
Impairment Charges | [4],[7] | 0.0 |  |  |  |
Currency impact | [7] | 0.0 |  | (0.5) |  |
Balance at end of period | [7] | $ 125.5 | [1] | $ 125.5 | [1] | $ 126.0
[1] | Balances were net of accumulated impairment loss of $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 both January 1, 2024 and December 31, 2024; and $807.4 ($24.7 related to Southern Europe, $265.5 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, 2025.
[2] | Balances were net of accumulated impairment loss of $807.4 and $749.3 as of December 31, 2025 and 2024, respectively.
[3] | Impairment charges for the year ended December 31, 2025 consist of a goodwill impairment related to our investments in Switzerland and the United Kingdom and an impairment of an indefinite-lived intangible asset in our Switzerland business.
[4] | The impairment charges relate to our Switzerland and United Kingdom reporting units, which were recorded during the second quarter of 2025. See Note 1 to the Consolidated Financial Statements for further information.
[5] | Balances related to United States were $1,005.8, $1,007.2 an d $1,007.2 as of January 1, 2024, December 31, 2024 and December 31, 2025, respectively.
[6] | Balances related to France were $75.6, $70.9 and $80.5 as of January 1, 2024, December 31, 2024 and December 31, 2025, respectively. Balances related to Italy were $3.8, $3.5 and $4.0 as of January 1, 2024, December 31, 2024 and December 31, 2025, respectively.
[7] | The majority of the Corporate balance as of January 1, 2024, December 31, 2024 and 2025 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.

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