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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%

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