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Goodwill and Intangible Assets (Estimated Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2013 $ 2.0
2014 3.3
2015 2.7
2016 1.9
2017 $ 1.5