Supplemental Data - Advertising and Research and Development, Accounts Receivable, Inventory, Prepaid and Other Current Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Advertising and Research Development Expenses
Advertising expense (a)	$ 4.7	$ 6.0	$ 6.2
Research and development expense	9.2	8.9	$ 9.4
Accounts Receivable - net
From customers	116.1	117.0
Less allowance for doubtful accounts and sales discounts	(1.3)	(1.3)
Total	114.8	115.7
Inventories by Major Class:
Raw materials	35.6	36.2
Work in progress	30.1	35.0
Finished goods	78.3	79.2
Supplies and other	3.0	3.6
Inventories, gross	147.0	154.0
Excess of FIFO over LIFO cost	(15.4)	(10.5)
Total	131.6	143.5
FIFO values of inventories valued on the LIFO method	109.1	120.1
Decrease in LIFO inventory	0.6	0.5
Prepaid and Other Current Assets
Prepaid and other current assets	12.2	11.3
Spare parts	6.6	6.9
Receivable for income taxes	2.8	3.3
Total	$ 21.6	$ 21.5