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OTHER INFORMATION - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Expenses incurred related to capital structure | $ 23.1 | $ 41.8
Letter of credit |  |
Debt Instrument [Line Items] |  |
Letters of credit outstanding |  | 24.7
Cash collateral |  | $ 25.4

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- Definition Restructuring Costs, Negotiations With Lenders And Other Activities + References No definition available. + Details
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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Details
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