Stock-Based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
$ 36.8
|
$ 7.5
|
$ 4.7
|
| Stock options |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
1.9
|
1.7
|
1.5
|
| Stock appreciation rights |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
0.4
|
0.0
|
0.0
|
| Restricted stock units |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
9.0
|
5.8
|
3.2
|
| Performance-based restricted stock units |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
17.0
|
0.0
|
0.0
|
| Warrants |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Stock-based compensation expense |
$ 8.5
|
$ 0.0
|
$ 0.0
|