Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 4.5	$ 7.8	$ 13.9	$ 19.5
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	4.2	5.1	8.3	13.1
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.3	2.7	5.6	6.4
Electrical
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	4.3	7.2	12.8	17.7
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	4.2	5.0	7.8	12.3
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.1	2.2	5.0	5.4
Power
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.2	0.6	1.1	1.8
Power | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.0	0.1	0.5	0.8
Power | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 0.2	$ 0.5	$ 0.6	$ 1.0