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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($)
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | $ 1,628.1 | [1]
Currency impact | (3.6) |
Balance, September 30, 2022 | 1,631.7 | [1]
Reportable segments | Americas |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | 1,049.6 | [2]
Currency impact | (0.4) | [2]
Balance, September 30, 2022 | 1,050.0 | [2]
Reportable segments | Southern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | 148.2 | [3]
Currency impact | (1.5) | [3]
Balance, September 30, 2022 | 149.7 | [3]
Reportable segments | Northern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | 234.8 |
Currency impact | (2.2) |
Balance, September 30, 2022 | 237.0 |
Reportable segments | APME |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | 69.5 |
Currency impact | (0.5) |
Balance, September 30, 2022 | 69.0 |
Corporate |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2021 | 126.0 | [4]
Balance, September 30, 2022 | $ 126.0 | [4]
[1] | Balances were net of accumulated impairment loss of $694.2 as of both March 31, 2023 and December 31, 2022.
[2] | Balances related to the United States were $1,006.5 a s of both December 31, 2022 and March 31, 2023.
[3] | Balances related to France were $73.3 and $74.3 as of December 31, 2022 and March 31, 2023, respectively. Balances related to Italy were $3.7 as of both December 31, 2022 and March 31, 2023.
[4] | The majority of the Corporate balance 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 balances 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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