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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Segment Reporting Information [Line Items]    
Net Sales$ 764.3$ 685.0$ 2,131.6$ 1,901.9
Operating Income125.3117.6314.0276.8
Operating Income as a % of Net Sales16.40%17.20%14.70%14.60%
Electrical [Member]
    
Segment Reporting Information [Line Items]    
Net Sales526.6490.61,490.61,358.3
Operating Income81.583.9208.3185.1
Operating Income as a % of Net Sales15.50%17.10%14.00%13.60%
Power [Member]
    
Segment Reporting Information [Line Items]    
Net Sales237.7194.4641.0543.6
Operating Income$ 43.8$ 33.7$ 105.7$ 91.7
Operating Income as a % of Net Sales18.40%17.30%16.50%16.90%