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Revenues - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2019
Successor          
Disaggregation of Revenue [Line Items]          
Interest Income (Expense), Nonoperating, Net     $ 8.4    
Successor | Accounts Receivable [Member]          
Disaggregation of Revenue [Line Items]          
Allowance for Doubtful Accounts Receivable   $ 0.3 0.1    
Provision for Doubtful Accounts   4.3 (0.2)    
Successor | Miscellaneous Receivables [Member]          
Disaggregation of Revenue [Line Items]          
Allowance for Doubtful Accounts Receivable   4.3 4.3    
Successor | Longterm Customer Receivables [Member]          
Disaggregation of Revenue [Line Items]          
Long-term Investments and Receivables, Net   $ 139.3 $ 11.1    
Predecessor | Accounts Receivable [Member]          
Disaggregation of Revenue [Line Items]          
Provision for Doubtful Accounts $ 0.0     $ 0.8  
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         51.00%
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months         49.00%