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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
Long-term debt consisted of the following:
(Millions of dollars)
 
September 30,
2018
 
December 31,
2017
6.00% senior notes due 2023 (net of unamortized discount of $4.3 at September 30, 2018 and $5.0 at December 2017)
 
$
495.7

 
$
495.0

5.625% senior notes due 2027 (net of unamortized discount of $3.2 at September 30, 2018 and $3.5 at December 2017)
 
296.8

 
296.5

Term loan due 2020 (effective interest rate of 4.72% at September 30, 2018)
 
77.0

 
92.0

Capitalized lease obligations, vehicles, due through 2021
 
2.4

 
2.5

Less unamortized debt issuance costs
 
(4.1
)
 
(5.2
)
Total long-term debt
 
867.8

 
880.8

Less current maturities
 
21.2

 
19.9

Total long-term debt, net of current
 
$
846.6

 
$
860.9