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Share-Based Compensation (Schedule Of Compensation Cost And Related Income Tax Benefit Under Employee Stock Purchase Plan) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Compensation cost $ 1.4 $ 1.4 $ 5.3 $ 4.5
Related income tax benefit 0.5 0.5 1.8 1.6
Employee Stock Purchase 1999 Plan [Member]
       
Compensation cost 0.3 0.3 1.2 1.1
Related income tax benefit $ 0.1 $ 0.1 $ 0.4 $ 0.4