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BUSINESS COMBINATION - CONSIDERATION PAID (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 04, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Assets acquired and liabilities assumed        
Repayments of Span Alaska debt       $ 81.9
Span Alaska        
Business acquisition        
Percentage interest acquired 100.00%      
Total cash consideration        
Membership interests $ 117.0      
Total debt assumed 81.9      
Total payments 198.9      
Assets acquired and liabilities assumed        
Unallocated purchase price recorded as goodwill $ 78.6      
Condensed Consolidated Statements of Income and Comprehensive Income        
Operating revenue   $ 15.3 $ 44.1  
Intercompany revenue elimination   9.5 24.0  
Operating Income   $ 4.6 $ 10.5