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Consolidated Statement of Changes in Members' Equity - 3 months ended Mar. 31, 2018 - USD ($)
$ in Millions
Total
Common Units
Accumulated Other Comprehensive Loss
Non-Controlling Interest
Redeemable Non-Controlling Interest (Temporary Equity)
Member equity, beginning balance at Dec. 31, 2017 $ 5,556.7 $ 1,924.2 $ (2.0) $ 3,634.5  
Units outstanding, beginning balance (in shares) at Dec. 31, 2017 180,600,728 180,600,000      
Increase (Decrease) in Members' Equity          
Issuance of common units by ENLK $ 0.9     0.9  
Conversion of restricted units for common units, net of units withheld for taxes (2.9) $ (2.9)      
Conversion of restricted units for common units, net of units withheld for taxes (in shares)   400,000      
Non-controlling interest’s impact of conversion of restricted units (2.7)     (2.7)  
Unit-based compensation 8.8 $ 4.4   4.4  
Change in equity due to issuance of units by ENLK 0.4 (1.3)   1.7  
Contributions from non-controlling interests 22.7     22.7  
Distributions (168.7) (47.5)   (121.2)  
Net income 57.1 12.4   44.7  
Member equity, end balance at Mar. 31, 2018 $ 5,472.3 $ 1,889.3 $ (2.0) $ 3,585.0  
Units outstanding, end balance (in shares) at Mar. 31, 2018 181,033,767 181,000,000      
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2017         $ 4.6
Redeemable noncontrolling interest, ending balance at Mar. 31, 2018         $ 4.6