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Revenues - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Apr. 01, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2017
Successor              
Disaggregation of Revenue [Line Items]              
Interest Income $ 2.1       $ 6.3    
Successor | Accounts Receivable              
Disaggregation of Revenue [Line Items]              
Allowance for Doubtful Accounts Receivable 0.1       0.1   $ 0.3
Provision for Doubtful Accounts (0.4) $ (0.1)   $ 4.4 (0.2)    
Successor | Miscellaneous Receivables              
Disaggregation of Revenue [Line Items]              
Allowance for Doubtful Accounts Receivable 4.3       4.3   4.3
Successor | Long-term Customer Receivables              
Disaggregation of Revenue [Line Items]              
Long-term Investments and Receivables, Net $ 35.8       $ 35.8   $ 139.3
Predecessor | Accounts Receivable              
Disaggregation of Revenue [Line Items]              
Provision for Doubtful Accounts     $ 0.0        
Scenario, Forecast | One year or longer              
Disaggregation of Revenue [Line Items]              
Deferred Revenue           $ 5,800.0  
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months           47.00%  
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months           53.00%