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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
Long-term debt consisted of the following:
 December 31,
(Millions of dollars)20202019
5.625% senior notes due 2027 (net of unamortized discount of $2.4 at 2020 and $2.7 at 2019)
297.6 297.3 
4.75% senior notes due 2029 (net of unamortized discount of $5.4 at 2020 and $6.1 at 2019)
494.6 493.9 
Term loan due 2023 (effective interest rate of 2.67% at 2020 and 4.31% at 2019)
212.5 250.0 
Capitalized lease obligations, vehicles, due through 20242.1 2.4 
Unamortized debt issuance costs(4.4)(5.5)
Total long-term debt1,002.4 1,038.1 
Less current maturities51.2 38.8 
Total long-term debt, net of current$951.2 $999.3