Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 874.0	$ 855.8	$ 1,683.7	$ 1,615.3
Operating Income	$ 126.7	$ 143.7	$ 231.7	$ 248.5
Operating Income as a % of Net Sales	14.50%	16.80%	13.80%	15.40%
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Net sales	$ 615.0	$ 612.4	$ 1,184.8	$ 1,151.2
Operating Income	$ 74.5	$ 95.5	$ 137.8	$ 163.6
Operating Income as a % of Net Sales	12.10%	15.60%	11.60%	14.20%
Operating Segments | Power
Segment Reporting Information [Line Items]
Net sales	$ 259.0	$ 243.4	$ 498.9	$ 464.1
Operating Income	$ 52.2	$ 48.2	$ 93.9	$ 84.9
Operating Income as a % of Net Sales	20.20%	19.80%	18.80%	18.30%