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Consolidated Statements Of Partners' Capital - USD ($)
$ in Millions
Total
General Partner's Interest
Common units
Common Units
Class B Common Units
Common Units
Partners' capital at Dec. 31, 2014 $ 374.9 $ 70.0 $ 302.7 $ 2.2
Increase (Decrease) in Partners' Capital        
Net earnings allocated     186.2 3.0
Net Income Allocated to General Partners   117.7    
Net earnings 306.9      
Distributions (294.8) (111.5) (180.4) (2.9)
Partners' capital at Dec. 31, 2015 387.0 76.2 308.5 2.3
Increase (Decrease) in Partners' Capital        
Net earnings allocated     139.9 2.0
Net Income Allocated to General Partners   67.4    
Net earnings 209.3      
Distributions (257.5) (93.3) (161.7) (2.5)
Partners' capital at Dec. 31, 2016 338.8 50.3 286.7 1.8
Increase (Decrease) in Partners' Capital        
Net earnings allocated     109.8 1.5
Net Income Allocated to General Partners   42.6    
Net earnings 153.9      
Distributions (124.6) (28.1) (95.3) (1.2)
Partners' capital at Dec. 31, 2017 $ 368.1 $ 64.8 $ 301.2 $ 2.1