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Goodwill And Intangible Assets (Summary Of Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
2013 $ 33.0
2014 32.6
2015 31.7
2016 30.6
2017 27.7
Thereafter 101.4
Total estimated amortization expense $ 257.0