Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 723.8	$ 658.1
Operating Income	101.7	83.6
Operating Income as a % of Net Sales	14.10%	12.70%
Electrical [Member]
Segment Reporting Information [Line Items]
Net Sales	505.1	466.1
Operating Income	63.8	57.6
Operating Income as a % of Net Sales	12.60%	12.40%
Power [Member]
Segment Reporting Information [Line Items]
Net Sales	218.7	192.0
Operating Income	$ 37.9	$ 26.0
Operating Income as a % of Net Sales	17.30%	13.50%