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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% |

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