CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash, including cash equivalents	$ 143.2	$ 91.8
Short-term investments	21.9	26.5
Accounts receivable, net	182.9	147.2
Inventories	165.9	151.8
Deferred income taxes	7.4	7.9
Other current assets	36.0	46.8
Total current assets	557.3	472.0
Property, plant and equipment	1,226.8	1,136.8
Less accumulated depreciation and amortization	589.8	543.2
Property, plant and equipment, net	637.0	593.6
Investments in affiliated companies	60.7	56.2
Goodwill	111.5	111.5
Deferred income taxes	85.5	85.1
Intangible assets, net	50.9	52.0
Other noncurrent assets	24.5	28.7
Total Assets	1,527.4	1,399.1
Current liabilities:
Notes payable and other current debt	39.3	50.1
Accounts payable	81.3	89.8
Pension and other postretirement benefits	2.5	2.3
Accrued salaries, wages and benefits	52.9	45.0
Income taxes payable	19.8	7.8
Taxes other than income	9.1	9.5
Other current liabilities	70.7	38.7
Total current liabilities	275.6	243.2
Long-term debt	362.1	299.3
Deferred income taxes	20.2	21.6
Pension and other postretirement benefits	114.8	126.0
Other long-term liabilities	37.6	54.1
Total Liabilities	810.3	744.2
Commitments and contingencies (Note 12)
Total Equity	717.1	654.9
Total Liabilities and Equity	$ 1,527.4	$ 1,399.1