Revenue - Geographic Net Sales Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 711.4	$ 687.6	$ 2,224.6	$ 2,124.9
Residential
Disaggregation of Revenue [Line Items]
Net sales	397.6	375.5	1,247.3	1,185.1
Commercial
Disaggregation of Revenue [Line Items]
Net sales	155.8	148.6	475.4	453.8
Industrial
Disaggregation of Revenue [Line Items]
Net sales	158.0	163.5	501.9	486.0
U.S.
Disaggregation of Revenue [Line Items]
Net sales	438.5	417.4	1,395.1	1,317.8
Western Europe
Disaggregation of Revenue [Line Items]
Net sales	97.1	92.8	311.2	287.7
Developing
Disaggregation of Revenue [Line Items]
Net sales	117.6	117.3	346.0	346.0
Other Developed
Disaggregation of Revenue [Line Items]
Net sales	$ 58.2	$ 60.1	$ 172.3	$ 173.4