Inventories (Tables)

6 Months Ended

Jun. 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)	June 30, 2019		December 31, 2018
Raw materials	$	102.4	$	90.4
Work in process	38.9		42.2
Finished goods	91.0		81.9
	$	232.3	$	214.5