Restructuring Costs - Summary of Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Expected Costs		$ 33.9
Costs incurred	$ 5.5	19.5
Remaining costs at 9/30/15		8.9
Current Year Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs		24.1
Costs incurred	0.0	15.2
Remaining costs at 9/30/15		8.9
Current Year Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Expected Costs		22.3
Costs incurred	0.0	13.4
Remaining costs at 9/30/15		8.9
Current Year Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Expected Costs		1.8
Costs incurred	0.0	1.8
Remaining costs at 9/30/15		0.0
Prior Year Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Expected Costs		9.8
Costs incurred	5.5	4.3
Remaining costs at 9/30/15		0.0
Prior Year Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Expected Costs		9.8
Costs incurred	5.5	4.3
Remaining costs at 9/30/15		0.0
Prior Year Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Expected Costs		0.0
Costs incurred	$ 0.0	0.0
Remaining costs at 9/30/15		$ 0.0