Inventories

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventories

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)	March 31, 2021		December 31, 2020
Raw materials	$	116.0	$	133.5
Work in process	60.6		54.9
Finished goods	133.6		132.9
	$	310.2	$	321.3