Restructuring Costs - Summary of Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Expected Costs	$ 79.1
Cost incurred to date	32.0	$ 12.0	$ 20.3
Remaining costs	14.8
2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	42.2
Cost incurred to date	29.1	0.0	0.0
Remaining costs	13.1
2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	17.3
Cost incurred to date	2.9	12.7	0.0
Remaining costs	1.7
2017 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	19.6
Cost incurred to date	0.0	(0.7)	20.3
Remaining costs	0.0
Electrical | 2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	21.2
Cost incurred to date	18.3	0.0	0.0
Remaining costs	2.9
Electrical | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	12.5
Cost incurred to date	2.2	8.6	0.0
Remaining costs	1.7
Electrical | 2017 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	16.6
Cost incurred to date	0.0	(0.3)	16.9
Remaining costs	0.0
Power | 2019 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	21.0
Cost incurred to date	10.8	0.0	0.0
Remaining costs	10.2
Power | 2018 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	4.8
Cost incurred to date	0.7	4.1	0.0
Remaining costs	0.0
Power | 2017 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	3.0
Cost incurred to date	0.0	$ (0.4)	$ 3.4
Remaining costs	$ 0.0