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Inventory (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory components
The following table presents components of inventory:
(dollars in millions)
December 31,
20202019
Merchandise inventory$463.0 $445.2 
Finished goods115.9 104.4 
Raw materials123.2 125.1 
Work in process37.5 36.5 
Total$739.6 $711.2 
Inventory under the LIFO method:
Percentage of total inventory29 %31 %
Excess of current cost over carrying value$19.0 $4.3