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Share-based Compensation Compensation Expense for Restricted Stock and Performance Units (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 4.9 $ 4.0 $ 9.1 $ 7.6
Income tax benefit (1.9) (1.6) (3.5) (3.0)
Share-based compensation expense, net of tax benefit 3.0 2.4 5.6 4.6
Restricted Stock        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense 4.4 3.7 8.0 7.0
Performance Units        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation expense $ 0.5 $ 0.3 $ 1.1 $ 0.6