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BUSINESS COMBINATION - CONSIDERATION PAID (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 04, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets acquired and liabilities assumed        
Goodwill   $ 327.8 $ 327.8  
Repayments of Span Alaska debt       $ 81.9
Estimated future benefit payments        
Quarterly payments to ILA-PRSSA over an estimated period   1.0    
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        
Cash and cash equivalents 4.4      
Accounts receivable 11.1      
Prepaid and other current assets 0.9      
Property and equipment 8.1      
Intangibles – Customer relationships 79.3      
Intangibles – Trade name 27.3      
Other long-term assets 0.1      
Accounts payable (3.3)      
Accruals and other current liabilities (6.4)      
Capital lease obligations (1.2)      
Span Alaska's debt (81.9)      
Total identifiable assets less liabilities 38.4      
Goodwill $ 78.6      
Condensed Consolidated Statements of Income and Comprehensive Income        
Operating revenue   66.5 59.1 22.8
Operating Income   $ 16.7 12.8 $ 3.5
One-time acquisition related costs     $ 3.0