Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net sales	$ 835.9	$ 789.7	$ 2,377.3	$ 2,291.9
Operating Income	151.6	135.1	381.4	361.3
Operating Income as a % of Net Sales	18.10%	17.10%	16.00%	15.80%
Electrical [Member]
Segment Reporting Information [Line Items]
Net sales	597.6	551.8	1,677.4	1,593.2
Operating Income	104.5	90.7	255.0	235.7
Operating Income as a % of Net Sales	17.50%	16.40%	15.20%	14.80%
Power [Member]
Segment Reporting Information [Line Items]
Net sales	238.3	237.9	699.9	698.7
Operating Income	$ 47.1	$ 44.4	$ 126.4	$ 125.6
Operating Income as a % of Net Sales	19.80%	18.70%	18.10%	18.00%