Restructuring Costs - Summary of Costs (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Expected Costs	$ 20.4
Costs incurred	11.6	$ 5.5
Remaining costs at 6/30/15	3.3
Current Year Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	10.6
Costs incurred	7.4	0.0
Remaining costs at 6/30/15	3.2
Current Year Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Expected Costs	8.7
Costs incurred	6.2	0.0
Remaining costs at 6/30/15	2.5
Current Year Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Expected Costs	1.9
Costs incurred	1.2	0.0
Remaining costs at 6/30/15	0.7
Prior Year Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs	9.8
Costs incurred	4.2	5.5
Remaining costs at 6/30/15	0.1
Prior Year Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Expected Costs	9.8
Costs incurred	4.2	5.5
Remaining costs at 6/30/15	0.1
Prior Year Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Expected Costs	0.0
Costs incurred	0.0	$ 0.0
Remaining costs at 6/30/15	$ 0.0