Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3.3	$ 5.2	$ 12.5	$ 15.6
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3.2	4.0	10.2	11.3
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	1.2	2.3	4.3
Electrical
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.0	4.1	7.4	11.4
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.9	2.7	5.3	8.4
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	1.4	2.1	3.0
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.3	1.1	5.1	4.2
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.3	1.3	4.9	2.9
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ (0.2)	$ 0.2	$ 1.3