Consolidated Statements Of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net sales:
Other income	$ 0.9	$ 0.6	$ 0.8
Total	581.7	648.3	736.2
Cost of goods sold:
Materials, supplies and services	228.0	237.6	191.7
Gross margin	325.8	386.7	519.8
Other general and administrative expenses	3.2	1.1	2.1
Net earnings	306.9	370.0	502.4
Allocation of net earnings:
Net earnings	$ 306.9	$ 370.0	$ 502.4
Net earnings per Common Unit (in dollars per unit)	$ 10.06	$ 12.07	$ 15.77
Affiliates
Net sales:
Product sales to an affiliate of the General Partner	$ 580.2	$ 647.1	$ 734.8
Other income	0.6	0.6	0.6
Cost of goods sold:
Services provided by affiliates of the General Partner	27.9	24.0	24.7
Selling, general and administrative services provided by affiliates of the General Partner	$ 15.7	$ 15.6	$ 15.3