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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents      
Outstanding checks in excess of funds on deposits $ 13.8 $ 16.4  
Restricted Cash 7.2 4.9  
Allowance for doubtful accounts      
Balance at Beginning of year 4.8 4.6 $ 4.2
Expense 0.6 0.8 1.0
Write-offs and Other (1.1) (0.6) (0.6)
Balance at End of Year 4.3 4.8 $ 4.6
Prepaid and Other Assets:      
Income tax receivables 12.8 26.8  
Prepaid insurance and insurance related receivables 13.4 12.6  
Prepaid fuel 13.7 16.3  
Other 9.7 7.7  
Total 62.5 75.1  
Carrying value      
Cash and Cash Equivalents      
Cash and cash equivalents 21.2 19.6  
Restricted Cash 7.2 4.9  
Variable rate debt 379.1 235.0  
Fixed rate debt 579.3 621.4  
Fair Value Measurement      
Cash and Cash Equivalents      
Cash and cash equivalents 21.2 19.6  
Restricted Cash 7.2 4.9  
Variable rate debt 379.1 235.0  
Fixed rate debt 585.9 584.5  
Quoted Prices in Active Markets (Level 1)      
Cash and Cash Equivalents      
Cash and cash equivalents 21.2 19.6  
Restricted Cash 7.2 4.9  
Significant Observable Inputs (Level 2)      
Cash and Cash Equivalents      
Variable rate debt 379.1 235.0  
Fixed rate debt $ 585.9 $ 584.5