Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventory classes

The classes of inventory as of December 31 are summarized as follows:

($ in millions)	2020		2019
Finished goods	$	90.3	$	95.8
Work in process	19.9		25.2
Raw materials	123.5		103.1
Total	$	233.7	$	224.1