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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents      
Outstanding checks in excess of funds on deposits $ 16.4 $ 18.7  
Restricted Cash 4.9    
CCF - cash on deposit 4.9    
Accounts Receivable      
Eligible accounts receivable assigned to CCF 1.0 134.8  
Allowance for doubtful accounts      
Balance at Beginning of year 4.6 4.2 $ 6.6
Expense (Recovery) 0.8 1.0 (0.3)
Write-offs and Other (0.6) (0.6) (2.1)
Balance at End of Year 4.8 4.6 $ 4.2
Prepaid and Other Assets:      
Income tax receivables 26.8 2.6  
Prepaid insurance and insurance related receivables 12.6 19.3  
Prepaid fuel 16.3 14.4  
Other 7.7 9.0  
Total 75.1 51.6  
Carrying value      
Cash and Cash Equivalents      
Cash and cash equivalents 19.6 19.8  
Restricted Cash 4.9 0.9  
CCF - cash on deposit 4.9 0.9  
Variable rate debt 235.0 205.0  
Fixed rate debt 621.4 652.1  
Fair Value Measurement      
Cash and Cash Equivalents      
Cash and cash equivalents 19.6 19.8  
Restricted Cash 4.9 0.9  
CCF - cash on deposit 4.9 0.9  
Variable rate debt 235.0 205.0  
Fixed rate debt 584.5 651.4  
Quoted Prices in Active Markets (Level 1)      
Cash and Cash Equivalents      
Cash and cash equivalents 19.6 19.8  
Restricted Cash 4.9    
CCF - cash on deposit 4.9    
Significant Observable Inputs (Level 2)      
Cash and Cash Equivalents      
Restricted Cash   0.9  
CCF - cash on deposit   0.9  
Variable rate debt 235.0 205.0  
Fixed rate debt $ 584.5 $ 651.4