Revenue - Geographic Net Sales Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 780.6	$ 754.0	$ 1,513.2	$ 1,437.3
Residential
Disaggregation of Revenue [Line Items]
Net sales	437.5	421.8	849.7	809.6
Commercial
Disaggregation of Revenue [Line Items]
Net sales	167.8	160.5	319.6	305.2
Industrial
Disaggregation of Revenue [Line Items]
Net sales	175.3	171.7	343.9	322.5
U.S.
Disaggregation of Revenue [Line Items]
Net sales	504.2	469.3	956.6	900.4
Western Europe
Disaggregation of Revenue [Line Items]
Net sales	103.8	99.6	214.1	194.9
Developing
Disaggregation of Revenue [Line Items]
Net sales	115.4	123.7	228.4	228.7
Other Developed
Disaggregation of Revenue [Line Items]
Net sales	$ 57.2	$ 61.4	$ 114.1	$ 113.3