Condensed Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Sales	$ 508.7	$ 529.1	$ 1,015.9	$ 965.1
Operating expenses:
Cost of goods sold	391.4	413.7	784.3	772.9
Selling and administration	45.1	42.5	88.8	82.0
Restructuring charges	1.8	2.4	3.7	2.5
Other operating (expense) income	(0.1)	0.2	0.4	1.6
Operating income	70.3	70.7	139.5	109.3
Earnings of non-consolidated affiliates	0.6	0.7	0.8	7.7
Interest expense	5.8	7.4	12.3	14.6
Interest income	0.3	0.3	0.5	0.5
Other (expense) income	(2.1)	(0.6)	(4.7)	180.6
Income before taxes	63.3	63.7	123.8	283.5
Income tax provision	15.7	21.6	37.5	107.7
Net income	$ 47.6	$ 42.1	$ 86.3	$ 175.8
Net income per common share:
Basic	$ 0.59	$ 0.53	$ 1.08	$ 2.20
Diluted	$ 0.59	$ 0.52	$ 1.07	$ 2.18
Dividends per common share	$ 0.20	$ 0.20	$ 0.40	$ 0.40
Average common shares outstanding:
Basic	80.1	80.0	80.1	79.8
Diluted	80.7	81.1	80.8	80.7