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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net sales:        
Other income $ 0.2 $ 0.1 $ 0.4 $ 0.4
Total 153.6 167.5 280.2 345.2
Cost of goods sold:        
Materials, supplies and services 43.4 57.4 97.4 122.0
Gross margin 103.7 104.2 168.7 211.7
Other general and administrative expenses 0.4 0.3 2.5 1.0
Allocation of net earnings:        
Net earnings $ 99.3 $ 100.1 $ 158.3 $ 203.0
Net earnings per Common Unit (in dollars per unit) $ 3.31 $ 3.16 $ 5.34 $ 6.42
Affiliate of General Partner        
Net sales:        
Product sales to an affiliate of the General Partner $ 153.2 $ 167.2 $ 279.5 $ 344.5
Other income 0.2 0.2 0.3 0.3
Cost of goods sold:        
Services provided by affiliates of the General Partner 6.5 5.9 14.1 11.5
Selling, general and administrative services provided by affiliates of the General Partner 4.0 3.8 7.9 7.7
General Partner        
Allocation of net earnings:        
Net earnings 37.1 40.7 58.0 82.2
Common Units | Class B Common Units        
Allocation of net earnings:        
Net earnings 0.9 1.0 1.5 2.0
Common Units | Common Units        
Allocation of net earnings:        
Net earnings $ 61.3 $ 58.4 $ 98.8 $ 118.8