Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales:
Product sales		$ 564.0	$ 507.0
Other income	0.4	0.6	0.7
Total	798.9	564.6	507.7
Cost of goods sold:
Materials, supplies and services	253.8	329.1	330.4
Gross margin	524.5	217.6	160.9
Other general and administrative expenses	2.1	1.4	2.1
Earnings from operations	507.9	201.9	143.9
Interest expense		(0.4)	(0.3)
Interest income	0.1	0.1	0.7
Net earnings	508.0	201.6	144.3
Allocation of net earnings:
General Partner	219.4	51.4	42.9
Net earnings	508.0	201.6	144.3
Net earnings per Common Unit (in dollars per unit)	$ 15.33	$ 8.01	$ 5.40
Affiliates
Net sales:
Product sales	797.9
Other income	0.6
Cost of goods sold:
Services	20.6	17.9	16.4
Selling, general and administrative services	14.5	14.3	14.9
Class B Common
Allocation of net earnings:
Common Units	5.0	2.0	1.4
Common
Allocation of net earnings:
Common Units	$ 283.6	$ 148.2	$ 100.0