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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | $ 1,297.1
Goodwill acquired |  | 42.9
Goodwill allocated to business units sold |  | (20.1)
Impairment charge | $ 0.0 | (64.0)
Currency and other impacts |  | (24.1)
Balance, September 30, 2019 | 1,231.8 | 1,231.8
Reportable segments | Americas |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 519.9
Goodwill acquired |  | 9.1
Currency and other impacts |  | 0.9
Balance, September 30, 2019 | 529.9 | 529.9
Reportable segments | Southern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 112.2
Goodwill acquired |  | 33.8
Currency and other impacts |  | (5.1)
Balance, September 30, 2019 | 140.9 | 140.9
Reportable segments | Northern Europe |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 435.4
Impairment charge |  | (60.2)
Currency and other impacts |  | (18.9)
Balance, September 30, 2019 | 356.3 | 356.3
Reportable segments | APME |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 102.0
Goodwill allocated to business units sold |  | (18.5)
Impairment charge |  | (3.8)
Currency and other impacts |  | (1.0)
Balance, September 30, 2019 | 78.7 | 78.7
Reportable segments | Right Management |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 62.1
Balance, September 30, 2019 | 62.1 | 62.1
Corporate |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2018 |  | 65.5
Goodwill allocated to business units sold |  | (1.6)
Balance, September 30, 2019 | $ 63.9 | $ 63.9

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