Inventories (Tables)

9 Months Ended

Sep. 30, 2019

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)	September 30, 2019		December 31, 2018
Raw materials	$	99.2	$	90.4
Work in process	38.3		42.2
Finished goods	92.9		81.9
	$	230.4	$	214.5