Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 1,108.6	$ 1,204.0	$ 3,148.1	$ 3,487.7
Electrical
Disaggregation of Revenue [Line Items]
Net Sales	591.2	689.3	1,704.4	2,007.7
Electrical | United States
Disaggregation of Revenue [Line Items]
Net Sales	535.9	618.2	1,547.5	1,804.3
Electrical | International
Disaggregation of Revenue [Line Items]
Net Sales	55.3	71.1	156.9	203.4
Electrical | Commercial and Industrial
Disaggregation of Revenue [Line Items]
Net Sales	194.8	237.0	575.5	692.6
Electrical | Construction and Energy
Disaggregation of Revenue [Line Items]
Net Sales	181.9	213.0	533.0	608.7
Electrical | Lighting
Disaggregation of Revenue [Line Items]
Net Sales	214.5	239.3	595.9	706.4
Utility Solutions
Disaggregation of Revenue [Line Items]
Net Sales	517.4	514.7	1,443.7	1,480.0
Utility Solutions | United States
Disaggregation of Revenue [Line Items]
Net Sales	484.7	477.7	1,359.0	1,386.7
Utility Solutions | International
Disaggregation of Revenue [Line Items]
Net Sales	32.7	37.0	84.7	93.3
Utility Solutions | Power Systems
Disaggregation of Revenue [Line Items]
Net Sales	369.7	339.5	1,008.9	965.5
Utility Solutions | Aclara
Disaggregation of Revenue [Line Items]
Net Sales	$ 147.7	$ 175.2	$ 434.8	$ 514.5