Inventories

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

3.  Inventories

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

($ in millions)	June 30, 2018			December 31, 2017
Raw materials	$	152.1		$	122.0
Work-in-process		135.2			98.8
Finished goods		234.4			227.7
Total inventories		521.7			448.5
Excess and obsolete inventory reserve		(52.1	)		(47.9	)
Inventories — net	$	469.6		$	400.6