PROPERTY AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property and equipment
Cost	$ 1,798.2us-gaap_PropertyPlantAndEquipmentGross	$ 1,794.8us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation	1,107.0	1,059.4
Property and equipment, net	691.2us-gaap_PropertyPlantAndEquipmentNet	735.4us-gaap_PropertyPlantAndEquipmentNet
Depreciation Expense	66.8us-gaap_Depreciation	67.4us-gaap_Depreciation	70.6us-gaap_Depreciation
Property and equipment subject to capital leases	2.6	3.1
Amortization expenses	0.3	0.3
Vessels
Property and equipment
Cost	1,263.8	1,260.2
Accumulated Depreciation	757.7	718.1
Property and equipment, net	506.1	542.1
Containers and equipment
Property and equipment
Cost	466.8	470.6
Accumulated Depreciation	316.1	310.4
Property and equipment, net	150.7	160.2
Terminal facilities and other property
Property and equipment
Cost	39.2	38.9
Accumulated Depreciation	33.2	30.9
Property and equipment, net	6.0	8.0
Construction in progress
Property and equipment
Cost	28.4	25.1
Property and equipment, net	$ 28.4	$ 25.1

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Name Accounting Standards Codification

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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