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Segment Information Revenues and Operating Margin (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues    
Sales of commodities $ 1,858.1 $ 1,171.0
Fees from midstream services 254.5 271.4
Revenues 2,112.6 1,442.4
Operating margin 306.5 299.3
Gathering and Processing [Member]    
Revenues    
Revenues 999.8 640.8
Operating margin 177.4 115.6
Logistics and Marketing [Member]    
Revenues    
Revenues 1,911.1 1,240.9
Operating margin 130.1 157.0
Other Segment [Member]    
Revenues    
Revenues (1.0) 26.8
Operating margin (1.0) 26.8
Corporate and Eliminations [Member]    
Revenues    
Revenues (797.3) (466.1)
Operating margin   (0.1)
Operating Segments [Member]    
Revenues    
Sales of commodities 1,858.1 1,171.0
Fees from midstream services 254.5 271.4
Revenues 2,112.6 1,442.4
Operating Segments [Member] | Gathering and Processing [Member]    
Revenues    
Sales of commodities 166.7 110.3
Fees from midstream services 118.2 115.8
Revenues 284.9 226.1
Operating Segments [Member] | Logistics and Marketing [Member]    
Revenues    
Sales of commodities 1,692.4 1,033.9
Fees from midstream services 136.3 155.6
Revenues 1,828.7 1,189.5
Operating Segments [Member] | Other Segment [Member]    
Revenues    
Sales of commodities (1.0) 26.8
Revenues (1.0) 26.8
Intersegment Eliminations [Member] | Gathering and Processing [Member]    
Revenues    
Sales of commodities 713.0 412.6
Fees from midstream services 1.9 2.1
Revenues 714.9 414.7
Intersegment Eliminations [Member] | Logistics and Marketing [Member]    
Revenues    
Sales of commodities 75.4 47.3
Fees from midstream services 7.0 4.1
Revenues 82.4 51.4
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]    
Revenues    
Sales of commodities (788.4) (459.9)
Fees from midstream services (8.9) (6.2)
Revenues $ (797.3) $ (466.1)