Supplemental Balance Sheet Data (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventories by major class:
Raw materials	$ 31.0	$ 26.1
Work in progress	34.2	16.8
Finished goods	61.7	65.8
Supplies and other	4.5	6.5
Inventories, gross	131.4	115.2
Adjust FIFO inventories to LIFO cost	(11.6)	(14.0)
Total	119.8	101.2
FIFO values of inventories valued on the LIFO method	$ 117.4	$ 95.7