Segment Information - Geographic Area Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Geographic Area Data
Revenues	$ 513.6	$ 485.7	$ 983.1	$ 917.2
United States
Geographic Area Data
Revenues	140.2	138.1	271.8	250.5
Canada
Geographic Area Data
Revenues	15.7	9.3	28.6	22.9
Total North America
Geographic Area Data
Revenues	155.9	147.4	300.4	273.4
Europe Middle East Africa
Geographic Area Data
Revenues	214.1	185.4	408.7	364.1
Asia Pacific
Geographic Area Data
Revenues	118.7	124.1	227.9	224.3
Latin America
Geographic Area Data
Revenues	$ 24.9	$ 28.8	$ 46.1	$ 55.4