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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | $ 1,297.1
Goodwill acquired |  | 31.6
Currency and other impacts |  | (2.3)
Impairment charge | $ (64.0) | (64.0)
Balance, June 30, 2019 | 1,262.4 | 1,262.4
Reportable segments | Americas |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 519.9
Goodwill acquired |  | 0.4
Currency and other impacts |  | 1.7
Balance, June 30, 2019 | 522.0 | 522.0
Reportable segments | Southern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 112.2
Goodwill acquired |  | 31.2
Currency and other impacts |  | (0.6)
Balance, June 30, 2019 | 142.8 | 142.8
Reportable segments | Northern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 435.4
Currency and other impacts |  | (4.1)
Impairment charge |  | (60.2)
Balance, June 30, 2019 | 371.1 | 371.1
Reportable segments | APME |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 102.0
Currency and other impacts |  | 0.7
Impairment charge |  | (3.8)
Balance, June 30, 2019 | 98.9 | 98.9
Reportable segments | Right Management |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 62.1
Balance, June 30, 2019 | 62.1 | 62.1
Corporate |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 65.5
Balance, June 30, 2019 | $ 65.5 | $ 65.5

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