Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.6	$ 3.5
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.8	3.0
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(0.2)	0.5
Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	0.5
Electrical Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.5	0.1
Electrical Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(0.2)	0.4
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	3.0
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	2.9
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 0.1