Operating Segment Information - Sales and Long-Lived Assets by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Geographic Area Data
Revenues	$ 504.5	$ 470.5	$ 513.6	$ 469.5	$ 520.0	$ 494.9	$ 485.7	$ 431.5	$ 1,958.1	$ 1,932.1	$ 1,716.5
Long-Lived Assets	1,317.7				1,110.5				1,317.7	1,110.5	831.8
Total North America
Geographic Area Data
Revenues									597.8	581.7	486.0
Long-Lived Assets	956.8				809.5				956.8	809.5	615.3
United States
Geographic Area Data
Revenues									540.2	533.8	437.3
Long-Lived Assets	937.9				793.0				937.9	793.0	599.8
Canada
Geographic Area Data
Revenues									57.6	47.9	48.7
Long-Lived Assets	18.9				16.5				18.9	16.5	15.5
Europe Middle East Africa
Geographic Area Data
Revenues									791.6	752.2	667.7
Long-Lived Assets	273.4				221.4				273.4	221.4	187.5
Germany
Geographic Area Data
Long-Lived Assets	228.2				172.5				228.2	172.5	142.2
EMEA excluding Germany [Member]
Geographic Area Data
Long-Lived Assets	45.2				48.9				45.2	48.9	45.3
Asia Pacific
Geographic Area Data
Revenues									475.4	481.5	459.8
Long-Lived Assets	80.3				72.9				80.3	72.9	21.1
Latin America
Geographic Area Data
Revenues									93.3	116.7	103.0
Long-Lived Assets	$ 7.2				$ 6.7				$ 7.2	$ 6.7	$ 7.9