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Goodwill and Other Intangible Assets - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Apr. 03, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 1,231.8 |  | $ 1,297.1
Jefferson Wells |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 55.5 |  |
Americas | United States |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 485.2 |  | 476.5
Americas | United States | Jefferson Wells |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 540.7 |  | 532.0
Northern Europe | Netherlands |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 106.5 |  | 112.0
Northern Europe | United Kingdom |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 90.2 |  | 93.7
Northern Europe | Germany |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 64.8 |  | 129.2
Southern Europe |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | $ 33.8 |
Southern Europe | France |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 65.5 |  | 68.9
Other Reporting Units |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 302.0 |  | 299.2
Reportable segments | Americas |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 529.9 |  | 519.9
Reportable segments | Northern Europe |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 356.3 |  | 435.4
Reportable segments | Southern Europe |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 140.9 |  | 112.2
Reportable segments | Right Management |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 62.1 |  | $ 62.1

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