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Predecessor Company Share-Based Compensation Expense and Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Share-based compensation expense |  | $ 21.8 | $ 38.3 | $ 34.9
Total share-based compensation expense | $ 1.9 | 21.8 | 38.3 | 34.9
Tax benefit | 0.0 | 0.0 | 0.0 | 0.0
Share-based compensation expense, net of tax benefit | 1.9 | 21.8 | 38.3 | 34.9
Cash received upon the exercise of stock options | 0.0 | 0.0 | 0.0 | 0.0
Write-off tax benefits related to share-based compensation | 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Equity classified awards |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Share-based compensation expense | $ 1.9 |  |  |

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- Definition The aggregate amount of noncash, equity- and liability- based employee renumeration. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116859624&loc=d3e23524-113945 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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