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Property, Plant and Equipment and Intangible Assets - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 19,596.0 $ 17,220.7
Accumulated depreciation and amortization (4,899.1) (4,292.3)
Property, plant and equipment, net 14,696.9 12,928.4
Intangible assets 2,736.6 2,736.6
Accumulated amortization (882.2) (753.4)
Intangible assets, net $ 1,854.4 1,983.2
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 $ 8,767.6 7,547.9
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 $ 4,968.0 4,007.7
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 $ 1,459.1 1,138.7
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 $ 2,221.9 445.1
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 50 years  
Other Property, Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 302.2 334.5
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 $ 154.4 144.3
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 1,675.9 $ 3,602.5
Finance Lease Right-of-Use Assets [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 46.9