XML 13 R54.htm IDEA: XBRL DOCUMENT v3.2.0.727
Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 4.4 $ 2.9 $ 8.0 $ 4.7
Tax benefit (0.4) (1.3) (0.7) (2.1)
Stock-based compensation expense, net of tax 4.0 1.6 7.3 2.6
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 4.4 2.7 7.9 4.3
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 0.0 $ 0.2 $ 0.1 $ 0.4