Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5.7	$ 7.4	$ 9.2	$ 10.4
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4.0	6.5	7.0	7.2
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.7	0.9	2.2	3.2
Electrical
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4.6	6.3	5.4	7.4
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.9	5.5	3.4	5.7
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.7	0.8	2.0	1.7
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.1	1.1	3.8	3.0
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.1	1.0	3.6	1.5
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 0.1	$ 0.2	$ 1.5