Restructuring Costs - By Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 24.1	$ 32.0	$ 12.0
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	19.3	22.3	8.2
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	4.8	9.7	3.8
Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	17.2	20.5	8.3
Electrical Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	13.1	12.5	4.9
Electrical Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	4.1	8.0	3.4
Utility Solutions
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	6.9	11.5	3.7
Utility Solutions | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	6.2	9.8	3.3
Utility Solutions | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 0.7	$ 1.7	$ 0.4