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Employee Incentive Plans - Restricted and Performance Awards (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 25, 2019
Jul. 23, 2018
Oct. 31, 2019
$ / shares
Jun. 30, 2019
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
$ / shares
Mar. 31, 2017
$ / shares
Mar. 31, 2018
$ / shares
Mar. 31, 2017
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Weighted Average Grant-Date Fair Value                        
Common units conversion ratio 1.15                      
Restricted incentive units                        
Number of Units                        
Vested (in shares)         (420,842)              
Weighted Average Grant-Date Fair Value                        
Fair value of units vested | $         $ 4.8              
Unrecognized compensation cost related to non-vested restricted incentive units | $                   $ 23.1    
Unrecognized compensation costs, weighted average period for recognition                   1 year 7 months 6 days    
Performance Shares                        
Number of Units                        
Non-vested, beginning of period (in shares)                   418,149    
Granted (in shares)                   1,202,105    
Vested (in shares)                   (374,745)    
Forfeited (in shares)                   (261,451)    
Converted to ENLC (in shares)                   333,798    
Non-vested, end of period (in shares)                   1,317,856 418,149  
Aggregate intrinsic value, end of period (in millions) | $                   $ 8.1    
Weighted Average Grant-Date Fair Value                        
Non-vested, beginning of period (in dollars per share) | $ / shares                   $ 19.15    
Granted (in dollars per share) | $ / shares                   11.73    
Vested (in dollars per share) | $ / shares                   21.08    
Forfeited (in dollars per share) | $ / shares                   15.68    
Converted to ENLC (in dollars per share) | $ / shares                   25.84    
Non-vested, end of period (in dollars per share) | $ / shares                   $ 14.22 $ 19.15  
Units withheld for payroll taxes (in shares)                   62,403    
Aggregate intrinsic value of units vested | $                   $ 3.4 $ 4.7  
Fair value of units vested | $                   $ 7.9 $ 7.7  
Vesting period                   3 years    
Unrecognized compensation cost related to non-vested restricted incentive units | $                   $ 10.2    
Unrecognized compensation costs, weighted average period for recognition                   1 year 9 months 18 days    
Performance Shares | Minimum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting   0.00%                    
Performance Shares | Maximum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting   100.00%                    
ENLC Performance Shares                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                        
Employee service share-based compensation, nonvested awards, additional compensation cost not yet recognized | $                   $ 2.1    
EnLink Midstream Partners, LP                        
Weighted Average Grant-Date Fair Value                        
Common units conversion ratio 1.15                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                        
Grant-date fair value (in dollars per share) | $ / shares           $ 19.24 $ 25.73 $ 19.24 $ 25.73      
Beginning TSR price (in dollars per share) | $ / shares               $ 15.44 $ 17.55      
Risk-free interest rate               2.38% 1.62%      
Volatility factor               43.85% 43.94%      
Distribution yield               10.50% 8.70%      
EnLink Midstream Partners, LP | Restricted incentive units                        
Number of Units                        
Non-vested, beginning of period (in shares)                   2,556,270    
Vested (in shares)                   (722,853)    
Forfeited (in shares)                   (4,490)    
Converted to ENLC (in shares)                   (1,828,927)    
Non-vested, end of period (in shares)                   0 2,556,270  
Weighted Average Grant-Date Fair Value                        
Non-vested, beginning of period (in dollars per share) | $ / shares                   $ 14.43    
Granted (in dollars per share) | $ / shares                   10.02    
Forfeited (in dollars per share) | $ / shares                   11.93    
Converted to ENLC (in dollars per share) | $ / shares                   16.11    
Non-vested, end of period (in dollars per share) | $ / shares                   $ 0 $ 14.43  
Units withheld for payroll taxes (in shares)                   249,201    
Aggregate intrinsic value of units vested | $                   $ 8.0 $ 13.1 $ 16.6
Fair value of units vested | $                   $ 7.2 $ 16.4 22.6
EnLink Midstream Partners, LP | Performance Shares                        
Number of Units                        
Non-vested, beginning of period (in shares)                   451,669    
Vested (in shares)                   (161,410)    
Converted to ENLC (in shares)                   (290,259)    
Non-vested, end of period (in shares)                   0 451,669  
Weighted Average Grant-Date Fair Value                        
Non-vested, beginning of period (in dollars per share) | $ / shares                   $ 17.74    
Vested (in dollars per share) | $ / shares                   10.54    
Converted to ENLC (in dollars per share) | $ / shares                   28.31    
Non-vested, end of period (in dollars per share) | $ / shares                   $ 0 $ 17.74  
Aggregate intrinsic value of units vested | $                   $ 2.1 $ 5.0  
Fair value of units vested | $                   $ 1.7 $ 7.7  
Vesting period                   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                        
Employee service share-based compensation, nonvested awards, additional compensation cost not yet recognized | $                   $ 0.7    
EnLink Midstream Partners, LP | Performance Shares | Minimum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting                   0.00%    
EnLink Midstream Partners, LP | Performance Shares | Maximum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting                   200.00%    
ENLC                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                        
Grant-date fair value (in dollars per share) | $ / shares     $ 7.29 $ 9.92 $ 13.10 21.63 28.77 $ 21.63 $ 28.77      
Beginning TSR price (in dollars per share) | $ / shares     $ 7.42 $ 9.84 $ 10.92 $ 16.55 $ 18.29          
Risk-free interest rate     1.44% 1.72% 2.42% 2.38% 1.62%          
Volatility factor     35.00% 33.50% 33.86% 51.36% 52.07%          
Distribution yield     10.10% 11.50% 9.70% 6.70% 5.40%          
ENLC | Restricted incentive units                        
Number of Units                        
Non-vested, beginning of period (in shares)                   2,425,867    
Granted (in shares)                   2,027,653    
Vested (in shares)                   (1,886,905)    
Forfeited (in shares)                   (606,276)    
Non-vested, end of period (in shares)                   4,063,605 2,425,867  
Aggregate intrinsic value, end of period (in millions) | $                   $ 24.9    
Weighted Average Grant-Date Fair Value                        
Non-vested, beginning of period (in dollars per share) | $ / shares                   $ 14.62    
Granted (in dollars per share) | $ / shares                   11.09    
Vested (in dollars per share) | $ / shares                   12.06    
Forfeited (in dollars per share) | $ / shares                   13.85    
Non-vested, end of period (in dollars per share) | $ / shares                   $ 13.85 $ 14.62  
Units withheld for payroll taxes (in shares)                   626,133    
Aggregate intrinsic value of units vested | $                   $ 17.3 $ 12.8 15.3
Fair value of units vested | $                   $ 22.8 $ 16.5 $ 22.2
ENLC | Performance Shares                        
Number of Units                        
Converted to ENLC (in shares)                   2,103,266    
Weighted Average Grant-Date Fair Value                        
Converted to ENLC (in dollars per share) | $ / shares                   $ 14.01    
Units withheld for payroll taxes (in shares)                   146,218    
ENLC | Performance Shares | Minimum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting                   0.00%    
ENLC | Performance Shares | Maximum                        
Weighted Average Grant-Date Fair Value                        
Percent of units vesting                   200.00%