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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted [1],[2] 2,184,100 790,397 63,500  
Intrinsic value of stock units vested $ 0.1 $ 0.3 $ 0.3  
Total intrinsic value of stock units vested $ 0.9 $ 1.0 $ 0.3  
Unvested stock units 2,752,054 [3],[4] 835,730 [3],[4] 79,612 [3],[4] 28,235
Net aggregate intrinsic value of stock awards outstanding $ 12.1      
Weighted average remaining contractual term of share units outstanding 2 years 7 months 6 days      
Market Performance-Based [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted 1,156,500 584,438    
Average common stock trading price $ 4.78 $ 16.26    
Unvested stock units 502,446      
[1] Stock units granted in 2015 included 584,438 stock units with a market condition for vesting based on an average common stock trading price of $16.26. As of December 31, 2016, these awards had not yet met the market condition.
[2] Stock units granted in 2016 included 1,156,500 stock units with a market condition for vesting based on an average common stock trading price of $4.78. The market condition for these awards was met on November 30, 2016.
[3] At December 31, 2016, the weighted average remaining contractual term of share units outstanding was 2.60 years.
[4] Excluding the 502,446 market-based stock awards that have not met their performance criteria, the net aggregate intrinsic value of stock awards outstanding at December 31, 2016 was $12.1 million.