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Consolidated Statement of Changes in Members' Equity - 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   180,600,000      
Increase (Decrease) in Members' Equity          
Conversion of restricted units for common units, net of units withheld for taxes (2.9) $ (2.9)   0.0  
Conversion of restricted units for common units, net of units withheld for taxes (in shares)   400,000      
Unit-based compensation 8.8 $ 4.4   4.4  
Contributions from non-controlling interests 22.7     22.7  
Distributions (168.7) (47.5)   (121.2)  
Fair value adjustment related to redeemable non-controlling interest (2.7) 0.0   (2.7) $ 0.0
Net income (loss) 57.1 12.4   44.7 0.0
Issuance of common units for ENLK public common units related to the Merger 0.9     0.9  
Change in equity due to issuance of units by ENLK 0.4 (1.3)   1.7  
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   181,000,000      
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2017         4.6
Increase (Decrease) in Temporary Equity          
Fair value adjustment related to redeemable non-controlling interest (2.7) $ 0.0   (2.7) 0.0
Net income 57.1 12.4   44.7 0.0
Redeemable noncontrolling interest, ending balance at Mar. 31, 2018         4.6
Member equity, beginning balance at Dec. 31, 2018 $ 4,974.2 $ 1,730.9 (2.0) 3,245.3  
Units outstanding, beginning balance (in shares) at Dec. 31, 2018 181,309,981 181,300,000      
Increase (Decrease) in Members' Equity          
Conversion of restricted units for common units, net of units withheld for taxes $ (8.4) $ (5.6)   (2.8)  
Conversion of restricted units for common units, net of units withheld for taxes (in shares)   1,000,000      
Unit-based compensation 13.6 $ 12.2   1.4  
Contributions from non-controlling interests 15.7     15.7  
Distributions (178.6) (51.0)   (127.6)  
Fair value adjustment related to redeemable non-controlling interest 2.5 2.5   0.0 (2.1)
Net income (loss) (134.8) (176.3)   41.5 0.0
Issuance of common units for ENLK public common units related to the Merger 399.0 $ 1,958.1   (1,559.1)  
Issuance of common units for ENLK public common units related to the Merger (in shares)   304,900,000      
Member equity, end balance at Mar. 31, 2019 $ 5,083.5 $ 3,471.1 $ (2.0) 1,614.4  
Units outstanding, end balance (in shares) at Mar. 31, 2019 487,160,080.000 487,200,000      
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2018         9.3
Increase (Decrease) in Temporary Equity          
Fair value adjustment related to redeemable non-controlling interest $ 2.5 $ 2.5   0.0 (2.1)
Net income $ (134.8) $ (176.3)   $ 41.5 0.0
Redeemable noncontrolling interest, ending balance at Mar. 31, 2019         $ 7.2