Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3.5	$ 3.0
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3.0	0.7
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.5	2.3
Electrical
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.9	1.2
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.5	0.2
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	1.0
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.6	1.8
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.5	0.5
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.1	$ 1.3