Condensed Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Statements of Income [Abstract]
Sales	$ 507.2	$ 436.0
Operating expenses:
Cost of goods sold	392.9	359.2
Selling and administration	43.7	39.5
Restructuring charges	1.9	0.1
Other operating income	0.5	1.4
Operating income	69.2	38.6
Earnings of non-consolidated affiliates	0.2	7.0
Interest expense	6.5	7.2
Interest income	0.2	0.2
Other (expense) income	(2.6)	181.2
Income before taxes	60.5	219.8
Income tax provision	21.8	86.1
Net income	$ 38.7	$ 133.7
Net income per common share:
Basic	$ 0.48	$ 1.68
Diluted	$ 0.48	$ 1.66
Dividends per common share	$ 0.20	$ 0.20
Average common shares outstanding:
Basic	80.1	79.6
Diluted	80.9	80.4