CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash, including cash equivalents	$ 175.0	$ 161.9
Short-term investments	8.2	12.4
Accounts receivable, net	189.0	175.0
Inventories	173.5	162.2
Deferred income taxes	8.9	7.7
Other current assets	35.1	38.1
Total current assets	589.7	557.3
Property, plant and equipment	1,271.4	1,274.8
Less accumulated depreciation and amortization	612.9	605.8
Property, plant and equipment, net	658.5	669.0
Investments in affiliated companies	55.6	59.8
Goodwill	111.0	112.5
Deferred income taxes	88.3	90.3
Intangible assets, net	49.9	50.6
Other noncurrent assets	24.1	24.5
Total Assets	1,577.1	1,564.0
Current liabilities:
Notes payable and other current debt	1.7	32.7
Accounts payable	91.6	102.9
Pension and other postretirement benefits	2.9	2.8
Accrued salaries, wages and benefits	38.2	56.5
Income taxes payable	16.5	15.6
Taxes other than income	11.5	7.8
Other current liabilities	45.7	43.5
Total current liabilities	208.1	261.8
Long-term debt	428.4	378.8
Deferred income taxes	19.2	20.8
Pension and other postretirement benefits	135.8	135.4
Other long-term liabilities	39.7	38.3
Total Liabilities	831.2	835.1
Commitments and contingencies (Note 13)
Total Equity	745.9	728.9
Total Liabilities and Equity	$ 1,577.1	$ 1,564.0