Restructuring Costs - Summary of Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Expected Costs	$ 75.9
Cost incurred to date	35.0	$ 23.6	$ 5.1
Remaining costs at 12/31/16	12.2
2016 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	41.5
Cost incurred to date	31.8	0.0
Remaining costs at 12/31/16	9.7
2015 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	24.9
Cost incurred to date	3.2	19.2
Remaining costs at 12/31/16	2.5
2014 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	9.5
Cost incurred to date		4.4	5.1
Operating Segments | Electrical | 2016 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	40.3
Cost incurred to date	30.7	0.0
Remaining costs at 12/31/16	9.6
Operating Segments | Electrical | 2015 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	23.0
Cost incurred to date	3.2	17.3
Remaining costs at 12/31/16	2.5
Operating Segments | Electrical | 2014 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	9.5
Cost incurred to date		4.4	$ 5.1
Operating Segments | Power | 2016 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	1.2
Cost incurred to date	1.1	0.0
Remaining costs at 12/31/16	0.1
Operating Segments | Power | 2015 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	1.9
Cost incurred to date	0.0	$ 1.9
Remaining costs at 12/31/16	$ 0.0