Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) buisness_group	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 834.8	$ 809.7
Operating Income	$ 101.9	$ 105.0
Operating Income as a % of Net Sales	12.20%	13.00%
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Number of business groups (business_group) | buisness_group	3
Net sales	$ 582.7	$ 569.7
Operating Income	$ 55.4	$ 63.4
Operating Income as a % of Net Sales	9.50%	11.10%
Operating Segments | Power
Segment Reporting Information [Line Items]
Net sales	$ 252.1	$ 240.0
Operating Income	$ 46.5	$ 41.6
Operating Income as a % of Net Sales	18.40%	17.30%