|
Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 0 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total payments for employees' tax obligations | $ 2.6 | $ 0 | |
| PSUs | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Percent of target shares earned | 200.00% | ||
| Shares withheld to satisfy tax withholding obligation | 0.2 | ||
| Total payments for employees' tax obligations | $ 2.6 | ||