Summary of Significant Accounting Policies - Software Costs (Details) - USD ($) $ in Millions |
2 Months Ended | 10 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2016 |
Nov. 03, 2016 |
Dec. 31, 2017 |
Dec. 31, 2015 |
|
| Capitalized Computer Software [Line Items] | ||||
| Capitalized Computer Software, Useful Life | 5 years | |||
| Capitalized Computer Software, Amortization | $ 2.5 | |||
| Successor | ||||
| Capitalized Computer Software [Line Items] | ||||
| Capitalized Computer Software, Net | $ 7.4 | $ 7.3 | ||
| Capitalized Computer Software, Amortization | $ 0.3 | |||
| Predecessor | ||||
| Capitalized Computer Software [Line Items] | ||||
| Capitalized Computer Software, Amortization | $ 1.5 | $ 1.4 | ||