Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Components of Inventories

The components of inventories were as follows (dollars in millions):

	March 31,		December 31,
	2018		2017
Raw materials	$	293.9	$	279.8
Work in process		14.4		12.6
Finished goods		202.2		217.0
Supplies and materials		255.9		253.1
Inventories	$	766.4	$	762.5