Restructuring Costs - Summary of Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Expected Costs	$ 77.7
Cost incurred to date	24.1	$ 32.0	$ 12.0
Remaining costs	9.6
2020 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	26.1
Cost incurred to date	18.4	0.0	0.0
Remaining costs	7.7
2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	36.7
Cost incurred to date	5.7	29.1	0.0
Remaining costs	1.9
2018 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	14.9
Cost incurred to date	0.0	2.9	12.0
Remaining costs	0.0
Electrical Solutions | 2020 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	24.7
Cost incurred to date	17.0	0.0	0.0
Remaining costs	7.7
Electrical Solutions | 2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	18.7
Cost incurred to date	0.2	18.3	0.0
Remaining costs	0.2
Electrical Solutions | 2018 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	10.5
Cost incurred to date	0.0	2.2	8.3
Remaining costs	0.0
Utility Solutions | 2020 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	1.4
Cost incurred to date	1.4	0.0	0.0
Remaining costs	0.0
Utility Solutions | 2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	18.0
Cost incurred to date	5.5	10.8	0.0
Remaining costs	1.7
Utility Solutions | 2018 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	4.4
Cost incurred to date	0.0	$ 0.7	$ 3.7
Remaining costs	$ 0.0