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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Increase (decrease) in deferred tax asset valuation allowance $ 17.3 $ 77.4   $ 16.8  
Deferred Tax Assets, Net, Noncurrent       26.0  
Deferred Tax Liabilities, Net, Current       26.0  
Deferred income taxes (2.4)        
Impairment of excess reorganization value       137.2  
Benefit for tax basis written off related to asset retirements 22.2        
Provision (benefit) for income taxes 2.4 1.0   0.3  
Other Comprehensive Income (Loss), Tax 2.4        
Liability for Uncertain Tax Positions, Noncurrent 1.3 1.3   1.0 $ 2.3
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction   (0.7)   (0.2)  
Income Tax Examination, Penalties and Interest Expense Reduction (Increase) 0.1 $ 0.3   0.1  
Income Tax Examination, Penalties and Interest Accrued 0.3     0.2  
Domestic Tax Authority [Member]          
Operating Loss Carryforwards       324.7  
Deferred income taxes $ (2.4)        
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards       15.4  
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change       $ 2.9  
Scenario, Forecast [Member]          
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction     $ (0.6)