Restructuring Costs - By Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 23.6	$ 5.1
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	15.3	3.4
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	8.3	1.7
Operating Segments | Electrical
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	21.7	5.1
Operating Segments | Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	14.5	3.4
Operating Segments | Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	7.2	1.7
Operating Segments | Power
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	1.9	0.0
Operating Segments | Power | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.8	0.0
Operating Segments | Power | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 1.1	$ 0.0