Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) group	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 908.8	$ 874.0	$ 1,743.6	$ 1,683.7
Operating Income	$ 132.1	$ 126.7	$ 234.0	$ 231.7
Operating Income as a % of Net Sales	14.50%	14.50%	13.40%	13.80%
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Number of business groups (in groups) | group			3
Net sales	$ 641.4	$ 615.0	$ 1,224.1	$ 1,184.8
Operating Income	$ 77.1	$ 74.5	$ 132.5	$ 137.8
Operating Income as a % of Net Sales	12.00%	12.10%	10.80%	11.60%
Operating Segments | Power
Segment Reporting Information [Line Items]
Net sales	$ 267.4	$ 259.0	$ 519.5	$ 498.9
Operating Income	$ 55.0	$ 52.2	$ 101.5	$ 93.9
Operating Income as a % of Net Sales	20.60%	20.20%	19.50%	18.80%