Share-based Compensation - Unrecognized Compensation Expense for Share-Based Awards (Details) $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2016
USD ($)
| |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation expense | $ 39.8 |
| Remaining weighted-average recognition period | 2 years 10 months 31 days |
| Restricted Stock | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation expense | $ 30.7 |
| Remaining weighted-average recognition period | 2 years 10 months 30 days |
| Performance Units | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation expense | $ 9.1 |
| Remaining weighted-average recognition period | 3 years |