CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales:
Other income	$ 0.2	$ 0.8	$ 0.6	$ 1.0
Total	128.4	181.1	567.9	573.6
Cost of goods sold:
Materials, supplies and services	44.3	39.6	146.5	133.5
Gross margin	76.8	136.0	402.4	424.0
Other general and administrative expenses	0.2	0.4	2.2	1.9
Earnings from operations	72.7	131.8	388.8	410.8
Net earnings	72.7	131.8	388.8	410.8
Allocation of net earnings:
General Partner	25.4	56.6	162.2	176.5
Net earnings	72.7	131.8	388.8	410.8
Net earnings per common unit (in dollars per unit)	$ 2.52	$ 4.00	$ 12.04	$ 12.45
Affiliates
Net sales:
Product sales	128.1	180.2	566.8	572.1
Other income	0.1	0.1	0.5	0.5
Cost of goods sold:
Services provided by the affiliates of the General Partner	7.3	5.5	19.0	16.1
Selling, general and administrative services provided by the affiliates of the General Partner	3.9	3.8	11.4	11.3
Class B Common
Allocation of net earnings:
Common Units	0.7	1.3	3.8	4.0
Common
Allocation of net earnings:
Common Units	$ 46.6	$ 73.9	$ 222.8	$ 230.3