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Goodwill and Intangible Assets (Estimated Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2013 $ 6.1
2014 7.3
2015 6.7
2016 5.9
2017 $ 5.5