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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1.8 $ 1.3 $ 9.6 $ 6.0
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 0.6 0.6 2.2 2.2
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1.2 $ 0.7 $ 7.4 $ 3.8