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Equity-Based Compensation Plans - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost share based awards $ 0.1 $ 0.9  
Shares [Roll Forward]      
Unvested, beginning balance (in shares) 114 261 421
Vested (in shares) (114) (141) (140)
Forfeited (in shares) 0 (6) (20)
Unvested, ending balance (in shares) 0 114 261
Weighted Average Grant-Date Fair Value [Roll Forward]      
Unvested, beginning balance (in dollars per share) $ 18.06 $ 17.98 $ 18.09
Vested (in dollars per share) 18.06 17.90 17.90
Forfeited (in dollars per share) 0.00 18.23 16.83
Unvested, ending balance (in dollars per share) $ 0.00 $ 18.06 $ 17.98
Restricted Stock And Share Unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost share based awards $ 6.2 $ 5.6 $ 5.0
Period of recognition 10 months 18 days    
Shares [Roll Forward]      
Unvested, beginning balance (in shares) 1,307 1,175 767
Granted (in shares) 730 496 730
Vested (in shares) (457) (306) (269)
Forfeited (in shares) (164) (58) (53)
Unvested, ending balance (in shares) 1,416 1,307 1,175
Weighted Average Grant-Date Fair Value [Roll Forward]      
Unvested, beginning balance (in dollars per share) $ 11.55 $ 11.30 $ 14.34
Granted (in dollars per share) 9.35 12.43 8.76
Vested (in dollars per share) 10.91 11.91 12.90
Forfeited (in dollars per share) 11.31 12.28 11.60
Unvested, ending balance (in dollars per share) $ 10.65 $ 11.55 $ 11.30
Vested but not distributed (in shares) 660 528 410