Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

The classes of inventory as of December 31 are summarized as follows ($ in millions):

	2018		2017
Finished goods	$	166.8	$	160.7
Work in process	34.3		32.4
Raw materials	77.6		82.6
Total	$	278.7	$	275.7