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SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT AND OTHER (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Impairment of Investment |  |  |
Impairment charges related to investment in SSAT | $ 0.0 | $ 0.0 | $ 0.0
Capitalized Interest |  |  |
Interest Costs Capitalized | $ 15.6 | $ 18.7 | $ 7.5
Dry-docking |  |  |
Number of dry-docking inspections to be made within a specified period | item | 2 |  |
Dry-dock inspections interval, minimum | 36 months |  |
Minimum |  |  |
Dry-docking |  |  |
Period within which number of specified dry-docking inspections to be made | 2 years |  |
Maximum |  |  |
Dry-docking |  |  |
Period within which number of specified dry-docking inspections to be made | 5 years |  |
Vessels |  |  |
Depreciation |  |  |
Useful life | 40 years |  |
Machinery And Equipment |  |  |
Depreciation |  |  |
Useful life | 30 years |  |
Terminal Facilities |  |  |
Depreciation |  |  |
Useful life | 35 years |  |

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