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Share-based Compensation Compensation Expense for Restricted Stock and Performance Units (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 4.6 $ 4.1 $ 13.7 $ 11.6
Income tax benefit (1.8) (1.6) (5.3) (4.5)
Share-based compensation expense, net of tax benefit 2.8 2.5 8.4 7.1
Restricted Stock        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 3.7 3.5 11.7 10.5
Performance Units        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 0.9 $ 0.6 $ 2.0 $ 1.1