Inventory (Tables)

12 Months Ended

Dec. 31, 2022

Inventory Disclosure [Abstract]

Schedule of inventory components

The following table presents components of inventory:

(dollars in millions)	December 31,
	2022			2021
Merchandise inventory	$	556.1		$	562.9
Finished goods	117.1			102.6
Raw materials	181.2			156.1
Work in process	59.1			50.4
Total	$	913.5		$	872.0
Inventory under the LIFO method:
Percentage of total inventory	26		%	23		%
Excess of current cost over carrying value	$	34.1		$	24.9