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Share-Based Compensation - Unrecognized Compensation Expense for Share-Based Awards (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense $ 35.2
Weighted-average recognition period 2 years 7 months 30 days
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense $ 27.1
Weighted-average recognition period 2 years 7 months 30 days
Performance Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense $ 8.1
Weighted-average recognition period 2 years 9 months 6 days