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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | [2] |  |  |  | $ 1,722,200,000 | [1] | $ 1,225,800,000 |  |
Goodwill Impairment charge |  | $ 0 | $ 0 | $ 0 | (50,000,000.0) | [2],[3] | 0 |  | $ (66,800,000)
Acquisitions |  |  |  |  | 2,300,000 | [2] | 522,700,000 | [2] | 0
Currency impact and other | [2] |  |  |  | (46,400,000) |  | (26,300,000) |  |
Balance at end of period | [2] |  |  |  | 1,628,100,000 | [1] | 1,722,200,000 | [1] | 1,225,800,000
Reportable segments | Americas |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | [4] |  |  |  | 1,058,900,000 |  | 536,600,000 |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |  |
Acquisitions | [4] |  |  |  | (6,500,000) |  | 522,700,000 |  |
Currency impact and other | [4] |  |  |  | (2,800,000) |  | (400,000) |  |
Balance at end of period | [4] |  |  |  | 1,049,600,000 |  | 1,058,900,000 |  | 536,600,000
Reportable segments | Southern Europe |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | [5] |  |  |  | 146,700,000 |  | 154,900,000 |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  | 8,800,000 | [5] |  |  |
Currency impact and other | [5] |  |  |  | (7,300,000) |  | (8,200,000) |  |
Balance at end of period | [5] |  |  |  | 148,200,000 |  | 146,700,000 |  | 154,900,000
Reportable segments | Northern Europe |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | 313,700,000 |  | 326,600,000 |  |
Goodwill Impairment charge | [3] |  |  |  | (50,000,000.0) |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Currency impact and other |  |  |  |  | (28,900,000) |  | (12,900,000) |  |
Balance at end of period |  |  |  |  | 234,800,000 |  | 313,700,000 |  | 326,600,000
Reportable segments | APME |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | 76,900,000 |  | 81,700,000 |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Currency impact and other |  |  |  |  | (7,400,000) |  | (4,800,000) |  |
Balance at end of period |  |  |  |  | 69,500,000 |  | 76,900,000 |  | 81,700,000
Corporate |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | [6] |  |  |  | 126,000,000.0 |  | 126,000,000.0 |  |
Goodwill Impairment charge |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Currency impact and other |  |  |  |  |  |  |  |  |
Balance at end of period | [6] |  |  |  | $ 126,000,000.0 |  | $ 126,000,000.0 |  | $ 126,000,000.0
[1] | Balances were net of accumulated impairment loss of $694.2 and $644.2 as of December 31, 2022 and 2021, 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] | Balances related to United States were $490.2, $1,013.0 and $1,006.5 as of January 1, 2021, December 31, 2021 and December 31, 2022, respectively. The increase in 2021 is related to the Experis acquisition. The 2022 reduction for acquisitions represents post-closing opening balance adjustments related to the Experis acquisition.
[5] | Balances related to France were $73.3, $68.2 and $73.3 as of January 1, 2021, December 31, 2021 and December 31, 2022, respectively. Balances related to Italy were $4.2, $3.9 and $3.7 as of January 1, 2021, December 31, 2021 and December 31, 2022, respectively.
[6] | The majority of the Corporate balance as of December 31, 2021 and 2022 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

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