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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - Omnibus Plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense $ 3.0 $ 1.7 $ 4.5 $ 2.7
Income tax benefit (1.2) (0.6) (1.8) (1.0)
Total $ 1.8 $ 1.1 $ 2.7 $ 1.7