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SIGNIFICANT ACCOUNTING POLICIES - FISCAL YEAR (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fiscal Year      
Fiscal Period Duration 371 days 364 days 364 days
Reclassification amount   $ 21.5  
Cash and Cash Equivalents      
Outstanding checks in excess of funds on deposits $ 21.3 13.8  
Capital Construction Fund - cash on deposit 31.2    
Accounts Receivable      
Eligible accounts receivable assigned to CCF 174.7 176.6  
Allowance for doubtful accounts      
Balance at Beginning of year 6.6 5.0 $ 4.1
Expense (Recovery) (0.3) 2.0 1.8
Write-offs and Other (2.1) (0.4) (0.9)
Balance at End of Year 4.2 6.6 $ 5.0
Prepaid and Other Assets:      
Income tax receivable 23.4 15.1  
Insurance 17.6 18.3  
Prepaid fuel 11.5 9.3  
Other 18.3 16.9  
Total 70.8 59.6  
Quoted Prices in Active Markets (Level 1)      
Cash and Cash Equivalents      
Cash and cash equivalents 13.9 25.5  
Significant Observable Inputs (Level 2)      
Cash and Cash Equivalents      
Accounts receivable, net 189.5 192.8  
Capital Construction Fund - cash on deposit 31.2    
Variable rate debt 55.0    
Fixed rate debt 685.2 443.8  
Carrying value      
Cash and Cash Equivalents      
Cash and cash equivalents 13.9 25.5  
Accounts receivable, net 189.5 192.8  
Capital Construction Fund - cash on deposit 31.2    
Variable rate debt 55.0    
Fixed rate debt 683.9 429.9  
Fair Value Measurement      
Cash and Cash Equivalents      
Cash and cash equivalents 13.9 25.5  
Accounts receivable, net 189.5 192.8  
Capital Construction Fund - cash on deposit 31.2    
Variable rate debt 55.0    
Fixed rate debt $ 685.2 $ 443.8