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Share-Based Payments Compensation Expense (Details) - Options and Sosars [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Pre-tax compensation expense (in dollars) $ 6.7 $ 3.2
Tax benefit (in dollars) (1.9) (0.8)
After-tax compensation expense (in dollars) $ 4.8 $ 2.4