Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories are valued at the lower of cost (on a first-in, first-out basis) and net realizable value. Inventory balances were as follows:

($ in millions)	September 30, 2021		December 31, 2020
Raw materials	$	140.4	$	133.5
Work in process	71.1		54.9
Finished goods	142.3		132.9
	$	353.8	$	321.3