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SIGNIFICANT ACCOUNTING POLICIES - IMMATERIAL CORRECTION (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Other long-term liabilities $ 177.3       $ 178.2       $ 177.3 $ 178.2    
Goodwill 327.8       327.8       327.8 327.8    
Income tax expense 6.3 $ 13.3 $ 8.8 $ 10.3 (146.0) $ 21.5 $ 15.6 $ 3.1 38.7 (105.8) $ 49.1  
Net Income 20.6 $ 41.6 $ 32.6 $ 14.2 165.9 $ 34.1 $ 24.0 $ 7.0 109.0 231.0 $ 81.4  
Ocean Transportation                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Goodwill $ 222.6               $ 222.6      
Adjustments | Revision of Defined Benefit Plan Liabilities                        
Error Corrections and Prior Period Adjustments Restatement [Line Items]                        
Other long-term liabilities                       $ 6.7
Deferred income taxes         $ 1.0         1.0   (2.6)
Goodwill                       $ 4.1
Income tax expense                   1.0    
Net Income                   $ (1.0)