Restructuring Costs and Other - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 3.7	$ 8.9	$ 9.5	$ 11.6
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	2.2	5.4	4.0	8.0
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	1.5	3.5	5.5	3.6
Electrical
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	3.4	8.4	8.9	10.4
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	2.0	5.4	3.8	7.3
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	1.4	3.0	5.1	3.1
Power
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.3	0.5	0.6	1.2
Power | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.2	0.0	0.2	0.7
Power | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 0.1	$ 0.5	$ 0.4	$ 0.5