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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Investments (Narrative) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |
Impairment charges | $ 8.3 | $ 21.0 | $ 14.2 | $ 3.2

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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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