Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.4	$ 3.3	$ 3.5	$ 12.5
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.0	3.2	2.9	10.2
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	0.1	0.6	2.3
Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.2	1.8	2.7	6.4
Electrical Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.0	1.7	2.3	4.4
Electrical Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.2	0.1	0.4	2.0
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.2	1.5	0.8	6.1
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	1.5	0.6	5.8
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.2	$ 0.0	$ 0.2	$ 0.3