Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of the components of inventories

The components of inventories as of September 30, 2018 and December 31, 2017 are summarized as follows:

($ in millions)	September 30, 2018			December 31, 2017
Raw materials	$	159.5		$	122.0
Work-in-process		131.8			98.8
Finished goods		253.9			227.7
Total inventories		545.2			448.5
Excess and obsolete inventory reserve		(52.1	)		(47.9	)
Inventories — net	$	493.1		$	400.6