Supplemental Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Advertising and Research Development Expenses
Advertising expense	$ 6.2	$ 6.8	$ 7.0
Research and development expense	9.4	6.8	$ 5.7
Accounts Receivable - net
From customers	98.0	99.0
Less allowance for doubtful accounts and sales discounts	(1.5)	(1.7)
Total	96.5	97.3
Inventories by Major Class:
Raw materials	31.6	30.4
Work in progress	26.8	28.9
Finished goods	63.0	67.2
Supplies and other	3.1	4.1
Inventories, gross	124.5	130.6
Excess of FIFO over LIFO cost	(8.2)	(10.0)
Total	116.3	120.6
FIFO values of inventories valued on the LIFO method	106.8	118.2
Decrease in LIFO inventory	0.1	0.1
Prepaid and Other Current Assets
Prepaid and other current assets	10.5	13.5
Spare parts	5.8	9.9
Receivable for income taxes	4.1	1.1
Total	$ 20.4	$ 24.5