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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Effect of Inventory Valuation Method on Net Income and Net Income Per Common Share
The following table summarizes the extent to which the Company's Inventories use the LIFO cost method, and presents the effect on inventories had the Company used the first-in, first-out (FIFO) inventory valuation method.
 
2019
 
2018
 
2017
Percentage of total inventories on LIFO
72
%
 
72
%
 
71
%
Excess of FIFO over LIFO
$
339.8

 
$
377.1

 
$
288.2