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Assets and Liabilities Measured at Fair Value (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments
The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at September 30, 2018 and December 31, 2017. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes Cash and cash equivalents, Accounts receivable-trade, Restricted cash, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal.  
 
 
At September 30, 2018
 
At December 31, 2017
 
 
Carrying
 
 
 
Carrying
 
 
(Millions of dollars)
 
Amount
 
Fair Value
 
Amount
 
Fair Value
Financial liabilities
 
 
 
 
 
 
 
 
Current and long-term debt
 
$
(867.8
)
 
$
(881.4
)
 
$
(880.8
)
 
$
(904.9
)