Inventory	12 Months Ended
	Dec. 31, 2021
Inventory [Abstract]
Inventory	5. INVENTORY Our inventory, comprised entirely of finished goods, is stated at the lower of cost (generally determined using the LIFO cost method) or market.  Inventories valued using the LIFO method comprised 87% and 89% of the total inventories at December 31, 2021 and 2020, respectively. Had the first-in, first-out (“FIFO”) method been used, merchandise inventory would have been $427.9 million and $227.2 million greater than reported under the LIFO method at December 31, 2021 and 2020, respectively.  We did not liquidate any portion of previously-created LIFO layers in 2021 and 2019. In 2020, we liquidated portions of previously created LIFO layers, resulting in decreases in cost of merchandise sold of $4.1 million. Reserves for excess and obsolete inventories were $14.0 million and $8.6 million at December 31, 2021 and 2020, respectively.  The change in the reserve for excess and obsolete inventories, included in cost of merchandise sold, was $5.4 million, $(0.6) million, and $1.4 million for the years ended December 31, 2021, 2020, and 2019, respectively.