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QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Data [Line Items] |  |  |  |  |
Loss contingency, loss in period | $ 46.1 |  |  |  |
Tax Cuts and Jobs Act of 2017, income tax benefit |  | $ (48.3) |  |  |
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |
Loss contingency, loss in period |  |  | $ 113.3 | $ 326.2 | $ 114.0

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- Definition Tax Cuts And Jobs Act Of 2017, Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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