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Revenues - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Apr. 01, 2017
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2017
Successor            
Disaggregation of Revenue [Line Items]            
Interest Income $ 2.1     $ 4.2    
Successor | Trade Accounts Receivable [Member]            
Disaggregation of Revenue [Line Items]            
Allowance for Doubtful Accounts Receivable 0.5     0.5   $ 0.3
Provision for Doubtful Accounts   $ 4.5   0.2    
Long-term Investments and Receivables, Net 47.5     47.5   139.3
Successor | Miscellaneous Accounts Receivable [Member]            
Disaggregation of Revenue [Line Items]            
Allowance for Doubtful Accounts Receivable $ 4.3     $ 4.3   $ 4.3
Predecessor | Trade Accounts Receivable [Member]            
Disaggregation of Revenue [Line Items]            
Provision for Doubtful Accounts     $ 0.0      
Scenario, Forecast | One year or longer            
Disaggregation of Revenue [Line Items]            
Deferred Revenue         $ 6,300.0  
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months         45.00%  
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months         55.00%