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Stock-Based Compensation - Components 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]        
Total stock-based compensation expense $ 4.0 $ 5.6 $ 9.4 $ 13.8
Pension benefits, net of tax 0 0 (0.3) 0
Performance-based Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1.6 1.6 1.8 3.6
Pension benefits, net of tax 3.0   3.0  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1.8 2.1 5.2 6.3
Restricted Stock Units And Deferred Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 0.6 $ 1.9 $ 2.4 $ 3.9