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FINANCE LEASE LIABILITY (Narrative) (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) containership | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) containership
Other Long-term Liabilities [Line Items] |  |  |
Number of container vessels under sale and leaseback transactions | containership | 7 |  | 7
Number of vessels under finance lease liability accounted for as vessels under finance lease | containership | 7 |  |
Finance lease, vessel bareboat charter period |  |  | 15 years
Disposal group, finance lease liability | $ |  |  | $ 464.7
Interest incurred on capital leases | $ | $ 13.1 | $ 30.1 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | River Box Holding Inc. ("River Box") |  |  |
Other Long-term Liabilities [Line Items] |  |  |
Subsidiary, percentage ownership sold (in percentage) |  |  | 50.10%

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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