Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans (Details 2)

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Benefit Plans (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
SERP & SRIP $ 0.8 $ 0.7 $ 2.5 $ 2.1
Defined Contribution Plan 4.2 3.8 12.8 11.3
Benefit Cost $ 5.0 $ 4.5 $ 15.3 $ 13.4