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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
SERP & SRIP $ 0.8 $ 0.7 $ 1.7 $ 1.4
Defined Contribution Plan 4.1 3.8 8.6 7.5
Benefit Cost $ 4.9 $ 4.5 $ 10.3 $ 8.9