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Property, Plant and Equipment and Intangible Assets - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 13,313.6 $ 12,518.7
Accumulated depreciation (3,086.8) (2,827.7)
Property, plant and equipment, net 10,226.8 9,691.0
Intangible assets 2,737.4 2,036.6
Accumulated amortization (472.7) (382.6)
Intangible assets, net $ 2,264.7 1,654.0
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 20 years  
Gathering Systems [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 6,849.2 6,626.8
Gathering Systems [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years  
Gathering Systems [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 20 years  
Processing and Fractionation Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 3,561.2 3,390.2
Processing and Fractionation Facilities [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years  
Processing and Fractionation Facilities [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years  
Terminaling and Storage Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 1,233.6 1,205.0
Terminaling and Storage Facilities [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years  
Terminaling and Storage Facilities [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years  
Transportation Assets [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 342.7 451.4
Transportation Assets [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 10 years  
Transportation Assets [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years  
Other Property, Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 284.0 274.2
Other Property, Plant and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 3 years  
Other Property, Plant and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 25 years  
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 122.4 121.3
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 920.5 $ 449.8