CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net sales:
Product sales		$ 166.7		$ 285.3
Other income	0.2	0.2	0.2	0.4
Total	198.6	166.9	394.6	285.7
Cost of goods sold:
Materials, supplies and services	61.3	93.6	127.1	169.0
Gross margin	132.8	69.4	257.9	109.0
Other general and administrative expenses	0.4	0.2	1.1	0.8
Earnings from operations	128.9	66.7	249.8	100.7
Interest expense				(0.1)
Net earnings	128.9	66.7	249.8	100.6
Allocation of net earnings:
General Partner	54.5	24.9	107.7	25.6
Net earnings	128.9	66.7	249.8	100.6
Net earnings per common unit (in dollars per unit)	$ 3.95	$ 2.22	$ 7.55	$ 4.00
Class B Common
Allocation of net earnings:
Common Units	1.3	0.7	2.4	1.0
Common
Allocation of net earnings:
Common Units	73.1	41.1	139.7	74.0
Affiliates
Net sales:
Product sales	198.2		394.0
Other income	0.2		0.4
Cost of goods sold:
Services	4.5	3.9	9.6	7.7
Selling, general and administrative services	$ 3.5	$ 2.5	$ 7.0	$ 7.5