Restructuring Costs and Other - Summary of Costs (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Total expected costs	$ 32.3
Costs incurred	2.1	$ 24.1
Remaining costs at 6/30/2021	6.1
2021 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	0.3
Costs incurred	0.3	0.0
Remaining costs at 6/30/2021	0.0
2021 Restructuring Actions | Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	0.3
Costs incurred	0.3	0.0
Remaining costs at 6/30/2021	0.0
2021 Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	0.0
Costs incurred	0.0	0.0
Remaining costs at 6/30/2021	0.0
2020 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	32.0
Costs incurred	1.8	24.1
Remaining costs at 6/30/2021	6.1
2020 and Prior Restructuring Actions | Electrical Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	21.8
Costs incurred	1.1	16.0
Remaining costs at 6/30/2021	4.7
2020 and Prior Restructuring Actions | Utility Solutions
Restructuring Cost and Reserve [Line Items]
Total expected costs	10.2
Costs incurred	0.7	$ 8.1
Remaining costs at 6/30/2021	$ 1.4