Revenue - Geographic Net Sales Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 713.6	$ 711.4	$ 2,202.0	$ 2,224.6
Residential
Disaggregation of Revenue [Line Items]
Net sales	395.5	397.6	1,230.1	1,247.3
Commercial
Disaggregation of Revenue [Line Items]
Net sales	154.3	155.8	475.7	475.4
Industrial
Disaggregation of Revenue [Line Items]
Net sales	163.8	158.0	496.2	501.9
U.S.
Disaggregation of Revenue [Line Items]
Net sales	445.0	438.5	1,382.1	1,395.1
Western Europe
Disaggregation of Revenue [Line Items]
Net sales	97.8	97.1	309.0	311.2
Developing
Disaggregation of Revenue [Line Items]
Net sales	119.9	117.6	357.8	346.0
Other Developed
Disaggregation of Revenue [Line Items]
Net sales	$ 50.9	$ 58.2	$ 153.1	$ 172.3