XML 13 R54.htm IDEA: XBRL DOCUMENT v3.3.0.814
Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 3.7 $ 6.2 $ 11.7 $ 10.9
Tax benefit (0.3) (0.7) (1.0) (2.8)
Stock-based compensation expense, net of tax 3.4 5.5 10.7 8.1
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes 3.6 4.7 11.5 9.0
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 0.1 $ 1.5 $ 0.2 $ 1.9