CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales:
Total	$ 119.0	$ 108.0
Cost of goods sold:
Materials, supplies and services	65.4	57.7
Gross margin	46.6	43.1
Other general and administrative expenses	0.5	1.5
Allocation of net earnings:
Net earnings	$ 42.2	$ 37.7
Net earnings per Common Unit (in dollars per unit)	$ 2.10	$ 1.44
Affiliate of General Partner
Net sales:
Product sales to affiliates of the General Partner	$ 118.9	$ 107.9
Other income from an affiliate of the General Partner	0.1	0.1
Cost of goods sold:
Services provided by affiliates of the General Partner	7.0	7.2
Selling, general and administrative services provided by affiliates of the General Partner	3.9	3.9
General Partner
Allocation of net earnings:
Net earnings	3.0	10.6
Common Units | Class B Common Units
Allocation of net earnings:
Net earnings	0.4	0.4
Common Units | Common Units
Allocation of net earnings:
Net earnings	$ 38.8	$ 26.7