Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.5	$ 5.7	$ 2.1	$ 9.2
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.1	4.0	1.9	7.0
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	1.7	0.2	2.2
Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.1	4.1	1.4	4.6
Electrical Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.8	2.6	1.3	2.7
Electrical Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	1.5	0.1	1.9
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	1.6	0.7	4.6
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3	1.4	0.6	4.3
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.1	$ 0.2	$ 0.1	$ 0.3