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PROPERTY AND EQUIPMENT - SUMMARY (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property and equipment |  |  |
Cost | $ 2,151.9 | $ 1,988.9 |
Accumulated depreciation of property and equipment | 1,202.7 | 1,128.6 |
Property and equipment, net | 949.2 | 860.3 |
Depreciation Expense | 86.0 | 76.4 | $ 66.8
Property and equipment subject to capital leases | 6.4 | 6.4 |
Cost for construction of containerships | 925.3 |  |
Capitalized interest | 2.1 | 0.4 | 0.4
Net of accumulated depreciation | 2.4 | 1.1 |
Amortization expenses | 1.2 | 0.6 | $ 0.3
Vessels |  |  |
Property and equipment |  |  |
Cost | 1,416.1 | 1,384.8 |
Accumulated depreciation of property and equipment | 840.7 | 787.4 |
Property and equipment, net | 575.4 | 597.4 |
Containers and equipment |  |  |
Property and equipment |  |  |
Cost | 536.9 | 496.0 |
Accumulated depreciation of property and equipment | 326.7 | 307.8 |
Property and equipment, net | 210.2 | 188.2 |
Terminal facilities and other property |  |  |
Property and equipment |  |  |
Cost | 43.2 | 42.0 |
Accumulated depreciation of property and equipment | 35.3 | 33.4 |
Property and equipment, net | 7.9 | 8.6 |
Vessel construction in progress |  |  |
Property and equipment |  |  |
Cost | 124.5 | 30.0 |
Property and equipment, net | 124.5 | 30.0 |
Capitalized interest | 2.9 | 0.8 |
Other construction in progress |  |  |
Property and equipment |  |  |
Cost | 31.2 | 36.1 |
Property and equipment, net | $ 31.2 | $ 36.1 |

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