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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Federal statutory income tax rate, percent                   35.00% 35.00%    
Federal net operating losses $ 789.7                 $ 789.7      
Other tax attributes consisting primarily of tax basis in property 15.3                 15.3      
Cancellation of debt income for tax                       $ 340.0  
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change                   2.9      
Deferred tax asset, increase (decrease)                   (288.9)      
Increase (decrease) in deferred tax asset valuation allowance                   261.5 $ (24.4)    
Cancellation of debt income for tax, adjustment                   32.5 4.1    
Provision (benefit) for income taxes (0.1) $ 0.0 $ 0.2 $ 0.0 $ 0.0 $ 0.0 $ 0.6   0.1 0.6    
Other Comprehensive Income (Loss), Tax                   0.0 0.0    
Liability for Uncertain Tax Positions, Noncurrent 0.3       0.4         0.3 0.4   $ 1.0
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction                   (0.1) (0.4)    
Income Tax Examination, Penalties and Interest Expense Reduction (Increase)                   0.1 0.1    
Income Tax Examination, Penalties and Interest Accrued         $ 0.1           $ 0.1    
State and Local Jurisdiction [Member]                          
Federal net operating losses $ 18.1                 $ 18.1      
Scenario, Forecast [Member]                          
Federal statutory income tax rate, percent                 21.00%