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Stock-Based Compensation - Summary of Restricted Stock Grants and PSUs (Details)
shares in Millions
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock  
Number of Restricted Shares  
Outstanding and non-vested, at December 31, 2016 (shares) 0.2
Granted (shares) 0.2
Vested (shares) (0.1)
Forfeited (shares) (0.1)
Outstanding and non-vested, at December 31, 2017 (shares) 0.2
Weighted Average Price per Share  
Outstanding and non-vested, at December 31, 2016 (usd per share) | $ / shares $ 14.03
Granted (usd per share) | $ / shares 16.94
Vested (usd per share) | $ / shares 15.09
Forfeited (usd per share) | $ / shares 15.69
Outstanding and non-vested, at December 31, 2017 (usd per share) | $ / shares $ 15.52
PSUs  
Number of Restricted Shares  
Outstanding and non-vested, at December 31, 2016 (shares) 0.4
Granted (shares) 0.2
Vested (shares) 0.0
Forfeited (shares) (0.3) [1]
Outstanding and non-vested, at December 31, 2017 (shares) 0.3
Weighted Average Price per Share  
Outstanding and non-vested, at December 31, 2016 (usd per share) | $ / shares $ 13.91
Granted (usd per share) | $ / shares 17.00
Vested (usd per share) | $ / shares 15.83
Forfeited (usd per share) | $ / shares 14.95
Outstanding and non-vested, at December 31, 2017 (usd per share) | $ / shares $ 15.19
Performance-based Restricted Stock Units, 2015 Grants | PSUs  
Number of Restricted Shares  
Forfeited (shares) (0.1) [1]
[1] Includes 0.1 million PSUs, representing the effect of the PSUs granted in 2015 not meeting the targets over the applicable performance period, which ended on December 31, 2017.