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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Summary of Inventory
Inventories consisted of the following:
(Millions of dollars)
 
September 30,
2018
 
December 31,
2017
Finished products - First-In, First-Out ("FIFO") basis
 
$
319.8

 
$
231.9

Less: Last-In, First-Out ("LIFO") reserve - finished products
 
(208.6
)
 
(167.2
)
Finished products - LIFO basis
 
111.2

 
64.7

Store merchandise for resale
 
98.0

 
104.8

Materials and supplies
 
5.9

 
13.0

Total inventories
 
$
215.1

 
$
182.5