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Income Taxes - Textual (Details) - USD ($) $ in Millions | 10 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jan. 01, 2018
Valuation Allowance [Line Items] |  |  |  |  |  |  |
Changes to valuation allowance during the period |  | $ 7.8 | $ 4.7 |  |  |  |
Remaining valuation allowance |  | 46.2 | 38.4 |  |  |  |
Deferred tax liability and additional cash tax benefits | $ 51.3 | 0.0 |  |  |  |  |
Unrecognized tax benefits, decrease resulting from current period tax positions | 33.7 |  |  |  |  |  |
Deferred tax liabilities, deferred expense, reserves and accruals |  |  |  |  |  | $ 23.6 |
Deferred revenue, additions |  |  |  | $ 22.2 |  |  |
Unrecognized income tax benefits | $ 0.3 | 0.2 | $ 0.4 |  | $ 0.9 |  | $ 0.3
Decrease in unrecognized tax benefits is reasonably possible |  | 0.2 |  |  |  |  |
State |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |
Net operating loss |  | $ 57.6 |  |  |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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