Equity - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||
| Stock-based compensation expense | $ 6.1 | $ 4.2 | $ 16.9 | $ 13.8 |
| Total unrecognized compensation expense | $ 47.0 | $ 47.0 | ||