Restructuring Costs - By Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	$ 2.7
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	2.6
Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	0.1
Electrical
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	2.0
Electrical | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	1.9
Electrical | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	0.1
Power
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	0.7
Power | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	0.7
Power | Selling & administrative expense
Restructuring Cost and Reserve [Line Items]
Pretax Restructuring Costs	$ 0