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Goodwill - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 1,343.0 | $ 1,239.9 |
Goodwill acquired | 6.1 | 35.0 |
Goodwill allocated to business units sold | (8.8) |  |
Currency impact and other | (43.2) | 68.1 |
Balance at end of period | 1,297.1 | 1,343.0 |
Accumulated impairment loss | 513.4 | 513.4 | $ 513.4
Americas | United States |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 476.5 | 476.5 |
Balance at end of period | 476.5 | 476.5 |
Southern Europe | France |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 76.3 | 66.8 |
Balance at end of period | 68.9 | 76.3 |
Southern Europe | Italy |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 5.0 | 4.4 |
Balance at end of period | 4.8 | 5.0 |
Reportable segments | Americas |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 519.2 | 516.4 |
Goodwill acquired | 4.6 | 0.0 |
Goodwill allocated to business units sold | 0.0 |  |
Currency impact and other | (3.9) | 2.8 |
Balance at end of period | 519.9 | 519.2 |
Reportable segments | Southern Europe |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 121.9 | 97.0 |
Goodwill acquired | 0.0 | 10.0 |
Goodwill allocated to business units sold | 0.0 |  |
Currency impact and other | (9.7) | 14.9 |
Balance at end of period | 112.2 | 121.9 |
Reportable segments | Northern Europe |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 468.1 | 421.9 |
Goodwill acquired | 0.0 | 0.1 |
Goodwill allocated to business units sold | (8.8) |  |
Currency impact and other | (23.9) | 46.1 |
Balance at end of period | 435.4 | 468.1 |
Reportable segments | APME |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 106.2 | 77.0 |
Goodwill acquired | 1.5 | 24.9 |
Goodwill allocated to business units sold | 0.0 |  |
Currency impact and other | (5.7) | 4.3 |
Balance at end of period | 102.0 | 106.2 |
Reportable segments | Right Management |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 62.1 | 62.1 |
Goodwill acquired | 0.0 | 0.0 |
Goodwill allocated to business units sold | 0.0 |  |
Currency impact and other | 0.0 | 0.0 |
Balance at end of period | 62.1 | 62.1 |
Corporate |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 65.5 | 65.5 |
Goodwill acquired | 0.0 | 0.0 |
Goodwill allocated to business units sold | 0.0 |  |
Currency impact and other | 0.0 | 0.0 |
Balance at end of period | 65.5 | $ 65.5 |
Corporate | Jefferson Wells |  |  |
Goodwill [Roll Forward] |  |  |
Balance at end of period | $ 55.5 |  |

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