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Revenues - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Dec. 31, 2017
Successor        
Disaggregation of Revenue [Line Items]        
Interest Income $ 2.1      
Successor | Trade Accounts Receivable [Member]        
Disaggregation of Revenue [Line Items]        
Allowance for Doubtful Accounts Receivable 0.5     $ 0.3
Provision for Doubtful Accounts 0.2      
Long-term Investments and Receivables, Net 52.9     139.3
Successor | Miscellaneous Accounts Receivable [Member]        
Disaggregation of Revenue [Line Items]        
Allowance for Doubtful Accounts Receivable $ 4.3     $ 4.3
Predecessor | Trade Accounts Receivable [Member]        
Disaggregation of Revenue [Line Items]        
Provision for Doubtful Accounts   $ 0.0    
Scenario, Forecast | Long-term contracts        
Disaggregation of Revenue [Line Items]        
Deferred Revenue     $ 6,000.0  
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months     50.00%  
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months     50.00%