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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 971,761 2,184,100 790,397  
Intrinsic value of stock units vested $ 4.6 $ 0.1 $ 0.3  
Total intrinsic value of stock units vested $ 2.9 $ 0.9 $ 1.0  
Unvested stock units 2,753,918 [1],[2] 2,752,054 [1],[2] 835,730 [1],[2] 79,612
Weighted average remaining contractual term of share units outstanding 1 year 4 months 24 days      
Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 80,000      
Average common stock trading price $ 11.72      
Net aggregate intrinsic value of stock awards outstanding $ 6.8      
Market Performance-Based [Member] | Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 502,446      
Average common stock trading price   $ 16.26    
Unvested stock units 582,446      
[1] At December 31, 2017, the weighted average remaining contractual term of share units outstanding was 1.40 years.
[2] Excluding the 582,446 market-based stock awards that have not met their performance criteria, the net aggregate intrinsic value of stock awards outstanding at December 31, 2017 was $6.8 million. At December 31, 2017, 502,446 and 80,000 stock units with a market condition for vesting based on an average common stock trading price of $16.26 and $11.72, respectively, had not yet met the market condition.