Restructuring Costs - By Segment (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total	Total
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 8.9	$ 11.6
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	5.4	8.0
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	3.5	3.6
Electrical
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	8.4	10.4
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	5.4	7.3
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	3.0	3.1
Power
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.5	1.2
Power | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	0.0	0.7
Power | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pre-tax Restructuring Costs	$ 0.5	$ 0.5