Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 778.4	$ 709.2	$ 1,502.2	$ 1,367.3
Operating Income	124.5	105.1	226.2	188.7
Operating Income as a % of Net Sales	16.00%	14.80%	15.10%	13.80%
Electrical [Member]
Segment Reporting Information [Line Items]
Net Sales	536.3	497.9	1,041.4	964.0
Operating Income	81.2	69.2	145.0	126.8
Operating Income as a % of Net Sales	15.10%	13.90%	13.90%	13.20%
Power [Member]
Segment Reporting Information [Line Items]
Net Sales	242.1	211.3	460.8	403.3
Operating Income	$ 43.3	$ 35.9	$ 81.2	$ 61.9
Operating Income as a % of Net Sales	17.90%	17.00%	17.60%	15.30%