Restructuring Costs and Other - Summary of Costs (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total expected costs	$ 45.1
Costs incurred	3.5	$ 32.0
Remaining costs at 3/31/2020	9.6
2020 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	1.7
Costs incurred	1.2	0.0
Remaining costs at 3/31/2020	0.5
2020 Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	1.4
Costs incurred	0.9	0.0
Remaining costs at 3/31/2020	0.5
2020 Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	0.3
Costs incurred	0.3	0.0
Remaining costs at 3/31/2020	0.0
2019 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	43.4
Costs incurred	2.3	32.0
Remaining costs at 3/31/2020	9.1
2019 and Prior Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	22.1
Costs incurred	0.0	20.5
Remaining costs at 3/31/2020	1.6
2019 and Prior Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	21.3
Costs incurred	2.3	$ 11.5
Remaining costs at 3/31/2020	$ 7.5