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GENERAL AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Property and equipment, net $ 908.1 $ 860.3
Accumulated depreciation of property and equipment 1,183.8 1,128.6
Vessels    
Vessel construction expenditures 67.3 29.2
Capitalized interest $ 1.9 $ 0.8