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Revenues, Remaining Performance Obligations (Details) - Midstream Services [Member]
$ in Millions
Sep. 30, 2018
USD ($)
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 20,511.7
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 816.6
Expected timing of satisfaction, period 3 months
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 3,361.4
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 3,036.9
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 2,528.8
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 2,050.0
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 8,718.0
Expected timing of satisfaction, period