Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 877.0	$ 895.3	$ 2,560.7	$ 2,510.6
Operating Income	$ 131.0	$ 142.8	$ 362.7	$ 391.3
Operating Income as a % of Net Sales	14.90%	15.90%	14.20%	15.60%
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Net sales	$ 617.5	$ 641.6	$ 1,802.3	$ 1,792.8
Operating Income	$ 78.8	$ 92.6	$ 216.6	$ 256.2
Operating Income as a % of Net Sales	12.80%	14.40%	12.00%	14.30%
Operating Segments | Power
Segment Reporting Information [Line Items]
Net sales	$ 259.5	$ 253.7	$ 758.4	$ 717.8
Operating Income	$ 52.2	$ 50.2	$ 146.1	$ 135.1
Operating Income as a % of Net Sales	20.10%	19.80%	19.30%	18.80%