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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 03, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,225,800,000 | $ 1,260,100,000 |  |  | $ 1,297,100,000
Goodwill, accumulated impairment loss |  |  |  |  |  | 644,200,000 | 577,400,000 |  | $ 513,400,000 |
Goodwill impairment charges | $ 0 |  | $ 0 |  | $ 0 | 66,800,000 | 64,000,000.0 |  |  |
Corporate |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 126,000,000.0 | 126,000,000.0 |  |  | $ 127,600,000
Goodwill, accumulated impairment loss |  |  |  |  |  | 278,200,000 | 278,200,000 |  | 278,200,000 |
Jefferson Wells |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 55,500,000 | 55,500,000 |  |  |
Right Management |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 62,100,000 | 62,100,000 |  |  |
Americas | United States |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 490,200,000 | 490,300,000 |  | 490,300,000 |
Americas | United States | Jefferson Wells |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 545,700,000 | 545,800,000 |  |  |
Southern Europe |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 33,800,000 |  |
Southern Europe | France |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 73,300,000 | 67,300,000 |  | 68,900,000 |
Southern Europe | Italy |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 4,200,000 | 4,600,000 |  | 4,800,000 |
Right Management |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill, accumulated impairment loss |  |  |  |  |  | 235,200,000 | 235,200,000 |  | $ 235,200,000 |
Northern Europe |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill, accumulated impairment loss |  |  |  |  |  | 127,000,000.0 | 60,200,000 |  |  |
Northern Europe | Germany |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 67,200,000 |  |  |
Goodwill impairment charges |  | $ 66,800,000 |  | $ 60,200,000 |  |  |  |  |  |
APME |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill, accumulated impairment loss |  |  |  |  |  | $ 3,800,000 | $ 3,800,000 |  |  |
APME | New Zealand |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  | $ 3,800,000 |  |  |  |  |  |

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