Consolidated Statements Of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales:
Other income	$ 0.0	$ 0.9	$ 0.6
Total	418.3	581.7	648.3
Cost of goods sold:
Materials, supplies and services	163.6	228.0	237.6
Gross margin	226.8	325.8	386.7
Other general and administrative expenses	1.9	3.2	1.1
Operating Income (Loss)	209.2	306.9	370.0
Interest Income, Other	0.1	0.0	0.0
Net earnings	209.3	306.9	370.0
Allocation of net earnings:
Net earnings	$ 209.3	$ 306.9	$ 370.0
Net earnings per Common Unit (in dollars per unit)	$ 7.56	$ 10.06	$ 12.07
Affiliates
Net sales:
Product sales to affiliates of the General Partner	$ 417.7	$ 580.2	$ 647.1
Other income	0.6	0.6	0.6
Cost of goods sold:
Services provided by affiliates of the General Partner	27.9	27.9	24.0
Selling, general and administrative services provided by affiliates of the General Partner	15.7	15.7	15.6
General Partner's Interests
Cost of goods sold:
Net earnings	67.4	117.7	143.1
Allocation of net earnings:
Net earnings	67.4	117.7	143.1
Common Units | Class B Common
Cost of goods sold:
Net earnings	2.0	3.0	3.6
Allocation of net earnings:
Net earnings	2.0	3.0	3.6
Common Units | Common Units
Cost of goods sold:
Net earnings	139.9	186.2	223.3
Allocation of net earnings:
Net earnings	$ 139.9	$ 186.2	$ 223.3