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Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Apr. 03, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1,260.1 |  | $ 1,297.1 |  | $ 1,343.0
Americas | United States |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 490.3 |  | 476.5 | $ 476.5 |
Americas | United States | Jefferson Wells |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 545.8 |  | 532.0 |  |
Northern Europe | Germany |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 67.2 |  | 129.2 |  |
Northern Europe | Netherlands |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 109.5 |  | 112.0 |  |
Northern Europe | United Kingdom |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 97.3 |  | 93.7 |  |
Southern Europe |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 33.8 |  |  |
Southern Europe | France |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 67.3 |  | 68.9 | $ 76.3 |
Other Reporting Units |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 310.9 |  | 299.2 |  |
Reportable segments | Americas |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 535.6 |  | 519.9 |  | 519.2
Reportable segments | Northern Europe |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 374.6 |  | 435.4 |  | 468.1
Reportable segments | Southern Europe |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 144.8 |  | 112.2 |  | 121.9
Reportable segments | Right Management |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 62.1 |  | $ 62.1 |  | $ 62.1

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