Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

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, 2020		December 31, 2019
Raw materials	$	104.6	$	100.9
Work in process	43.1		37.4
Finished goods	103.3		97.4
	$	251.0	$	235.7