Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales:
Other income	$ 0.8	$ 2.8	$ 0.4
Total	736.2	780.1	798.9
Cost of goods sold:
Materials, supplies and services	191.7	180.4	253.8
Gross margin	519.8	577.8	524.5
Other general and administrative expenses	2.1	2.0	2.1
Earnings from operations	502.4	560.8	507.9
Interest income			0.1
Net earnings	502.4	560.8	508.0
Allocation of net earnings:
General Partner	205.7	239.7	219.4
Net earnings	502.4	560.8	508.0
Net earnings per Common Unit (in dollars per unit)	$ 15.77	$ 17.06	$ 15.33
Affiliates
Net sales:
Product sales	734.8	776.7	797.9
Other income	0.6	0.6	0.6
Cost of goods sold:
Services provided by the General Partner and Affiliates	24.7	21.9	20.6
Selling, general and administrative services provided by the General Partner and Affiliates	15.3	15.0	14.5
Class B Common
Allocation of net earnings:
Common Units	4.9	5.5	5.0
Common
Allocation of net earnings:
Common Units	$ 291.8	$ 315.6	$ 283.6