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Employee Compensation and Benefit Plans Schedule of Stock Unit Activity (Footnote) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 1,809,373 971,761 2,184,100  
Intrinsic value of stock units vested $ 3.3 $ 4.6 $ 0.1  
Total intrinsic value of stock units vested $ 2.2 $ 2.9 $ 0.9  
Unvested stock units 2,946,800 [1],[2] 2,753,918 [1],[2] 2,752,054 [1],[2] 835,730
Weighted average remaining contractual term of share units outstanding 2 years 5 months 16 days      
Former Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 377,525      
Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 983,010      
Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Net aggregate intrinsic value of stock awards outstanding $ 3.3      
Market Performance-Based [Member] | Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 377,806      
Average common stock trading price   $ 16.26    
Unvested stock units 510,829      
Market Performance-Based [Member] | Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 40,000      
Average common stock trading price $ 11.72      
Market Performance-Based [Member] | Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 93,023      
Average common stock trading price $ 5.80      
[1] The total fair value of the stock units that vested during 2018, 2017 and 2016, based on grant-date fair value, was $2.2 million, $2.9 million and $0.9 million, respectively.
[2] The total intrinsic value of stock units vested, which is defined as the market value of the stock on the date of vesting, was $3.3 million, $4.6 million and $0.1 million for 2018, 2017 and 2016, respectively.