CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales:
Other income	$ 0.3	$ 0.3
Total	224.1	196.9
Cost of goods sold:
Materials, supplies and services	46.6	62.8
Gross margin	171.9	129.2
Other general and administrative expenses	1.3	1.3
Earnings from operations	166.8	124.2
Net earnings	166.8	124.2
Allocation of net earnings:
General Partner	73.0	53.1
Net earnings	166.8	124.2
Net earnings per common unit (in dollars per unit)	$ 4.98	$ 3.78
Affiliates
Net sales:
Product sales	223.7	196.5
Other income	0.1	0.1
Cost of goods sold:
Services provided by the affiliates of the General Partner	5.6	4.9
Selling, general and administrative services provided by the affiliates of the General Partner	3.8	3.7
Class B Common
Allocation of net earnings:
Common Units	1.6	1.2
Common
Allocation of net earnings:
Common Units	$ 92.2	$ 69.9