Restructuring Costs and Other - Summary of Costs (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total expected costs	$ 50.7
Costs incurred	9.2	$ 32.0
Remaining costs at 6/30/2020	9.5
2020 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	9.6
Costs incurred	6.5	0.0
Remaining costs at 6/30/2020	3.1
2020 Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	8.4
Costs incurred	5.3	0.0
Remaining costs at 6/30/2020	3.1
2020 Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	1.2
Costs incurred	1.2	0.0
Remaining costs at 6/30/2020	0.0
2019 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	41.1
Costs incurred	2.7	32.0
Remaining costs at 6/30/2020	6.4
2019 and Prior Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	21.6
Costs incurred	0.1	20.5
Remaining costs at 6/30/2020	1.0
2019 and Prior Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	19.5
Costs incurred	2.6	$ 11.5
Remaining costs at 6/30/2020	$ 5.4