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INCOME TAXES - Tax Reform (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 21, 2017
Income tax        
U.S. federal statutory rate   21.00%   35.00%
Surcharge on the U.S. federal tax rate   10.00%    
Percentage of expensing of certain qualified capital investments   100.00%    
Percentage of tax on earnings in the form of cash and cash equivalents   15.50%    
Percentage of tax on earnings other than in the form of cash and cash equivalents   8.00%    
Provision on the deemed repatriation of undistributed foreign earnings adjustment   $ 3.2    
Provision for deemed repatriation of undistributed foreign earnings     $ 7.4  
Benefit on the remeasurement of the deferred tax assets and liabilities     $ 18.0  
Provision on remeasurement of deferred taxes adjustment $ 0.4      
U.S. Virgin Islands        
Income tax        
U.S. federal statutory rate   23.10% 38.50%