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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (decrease) in deferred tax asset valuation allowance                   $ 24.4 $ 16.8  
Operating Loss Carryforwards $ 725.8                 725.8    
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change                   2.9    
Impairment of excess reorganization value                   0.0 137.2  
Provision (benefit) for income taxes 0.0 $ 0.0 $ 0.0 $ 0.6 $ 0.0 $ 0.0 $ 0.0 $ 0.3   0.6 0.3  
Other Comprehensive Income (Loss), Tax                   0.0 0.0  
Liability for Uncertain Tax Positions, Noncurrent 0.4       1.0         0.4 1.0 $ 1.3
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction                   (0.4) (0.2)  
Income Tax Examination, Penalties and Interest Expense Reduction (Increase)                   0.1 0.1  
Income Tax Examination, Penalties and Interest Accrued 0.1       $ 0.2         0.1 $ 0.2  
State and Local Jurisdiction [Member]                        
Operating Loss Carryforwards $ 17.7                 $ 17.7    
Scenario, Forecast [Member]                        
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction                 $ (0.2)