Goodwill and Other Intangible Assets - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,206.6	$ 1,225.8
Jefferson Wells
Goodwill [Line Items]
Goodwill	55.5
Sweden
Goodwill [Line Items]
Goodwill	42.1	43.6
Americas | United States
Goodwill [Line Items]
Goodwill	493.3	490.2
Americas | United States | Jefferson Wells
Goodwill [Line Items]
Goodwill	572.1	545.7
Northern Europe | Netherlands
Goodwill [Line Items]
Goodwill	114.2	119.3
Northern Europe | United Kingdom
Goodwill [Line Items]
Goodwill	110.3	100.2
Southern Europe | France
Goodwill [Line Items]
Goodwill	75.6	73.3
Other Reporting Units
Goodwill [Line Items]
Goodwill	$ 292.3	$ 343.7