COMMITMENTS AND CONTINGENT LIABILITIES (Book Value of Assets Pledged) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Book value of consolidated assets pledged under ship mortgages	$ 1,753.0	$ 1,527.0
Vessels and Equipment
Other Commitments [Line Items]
Book value of consolidated assets pledged under ship mortgages	1,351.8	1,424.4
Sales-type Leases, Direct Financing Leases and Leaseback Assets
Other Commitments [Line Items]
Book value of consolidated assets pledged under ship mortgages	$ 400.7	$ 103.1

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Name:	us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant