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Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (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, before income taxes $ 6.2 $ 2.6 $ 10.9 $ 5.8
Tax benefit (0.7) (1.1) (2.8) (2.4)
Stock-based compensation expense, net of tax 5.5 1.5 8.1 3.4
RSUs and PRSUs
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes 4.7 2.5 9.0 5.4
Stock options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 1.5 $ 0.1 $ 1.9 $ 0.4