Restructuring Costs and Other - Summary of Costs (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Total expected costs	$ 39.6
Costs incurred	9.5	$ 19.2
Remaining costs at 6/30/2016	10.9
2016 Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	15.6
Costs incurred	9.1	0.0
Remaining costs at 6/30/2016	6.5
2016 Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	14.5
Costs incurred	8.5	0.0
Remaining costs at 6/30/2016	6.0
2016 Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Total expected costs	1.1
Costs incurred	0.6	0.0
Remaining costs at 6/30/2016	0.5
2015 and Prior Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Total expected costs	24.0
Costs incurred	0.4	19.2
Remaining costs at 6/30/2016	4.4
2015 and Prior Restructuring Actions | Electrical
Restructuring Cost and Reserve [Line Items]
Total expected costs	22.1
Costs incurred	0.4	17.3
Remaining costs at 6/30/2016	4.4
2015 and Prior Restructuring Actions | Power
Restructuring Cost and Reserve [Line Items]
Total expected costs	1.9
Costs incurred	0.0	$ 1.9
Remaining costs at 6/30/2016	$ 0.0