Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Summary of Long-Term Debt

Long-term debt consisted of the following:

	December 31,
(Millions of dollars)	2019			2018
6.00% senior notes due 2023 (net of unamortized discount of $4.1 at 2018)	$	—		$	495.9
5.625% senior notes due 2027 (net of unamortized discount of $2.7 at 2019 and $3.1 at 2018)	297.3			296.9
4.75 % senior notes due 2029 (net of unamortized discount of $6.1 at 2019)	493.9			—
Term loan due 2020 (effective interest rate of 5.0% at 2018 )	—			72.0
Term loan due 2023 (effective interest rate of 4.3% at 2019)	250.0			—
Capitalized lease obligations, vehicles, due through 2022	2.4			2.3
Unamortized debt issuance costs	(5.5		)	(3.8		)
Total long-term debt	1,038.1			863.3
Less current maturities	38.8			21.2
Total long-term debt, net of current	$	999.3		$	842.1