Goodwill - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Apr. 03, 2019	Jan. 01, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 1,225.8	$ 1,260.1			$ 1,297.1
Jefferson Wells
Goodwill [Line Items]
Goodwill	55.5	55.5
Americas | United States
Goodwill [Line Items]
Goodwill	490.2	490.3		$ 490.3
Americas | United States | Jefferson Wells
Goodwill [Line Items]
Goodwill	545.7	545.8
Northern Europe | Germany
Goodwill [Line Items]
Goodwill		67.2
Northern Europe | Netherlands
Goodwill [Line Items]
Goodwill	119.3	109.5
Northern Europe | United Kingdom
Goodwill [Line Items]
Goodwill	100.2	97.3
Southern Europe
Goodwill [Line Items]
Goodwill			$ 33.8
Southern Europe | France
Goodwill [Line Items]
Goodwill	73.3	67.3		$ 68.9
Other Reporting Units
Goodwill [Line Items]
Goodwill	$ 387.3	$ 373.0