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Investments in Unconsolidated Affiliates Net Investments In and Earnings (Loss) from Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Net proceeds from sale of assets $ 945.0     $ 1.3 $ 943.1  
Proceeds from equity method investments       62.0 31.4  
Investment   $ 1,198.5   1,198.5   $ 1,115.4
Earnings from unconsolidated affiliates, net   11.5 $ 13.4 29.2 26.1  
Goodwill impairment   0.0 0.0 0.0 109.7  
Stagecoach Gas Services LLC            
Schedule of Equity Method Investments [Line Items]            
Net proceeds from sale of assets         3.0  
Proceeds from equity method investments       35.7 3.7  
Investment   854.3   854.3   871.0
Earnings from unconsolidated affiliates, net   6.4 6.8 19.0 9.1  
Difference between carrying amount and underlying equity   51.4   51.4    
Jackalope Gas Gathering Services, L.L.C.            
Schedule of Equity Method Investments [Line Items]            
Proceeds from equity method investments       19.4 19.9  
Investment   186.2   186.2   197.2
Earnings from unconsolidated affiliates, net   1.5 5.5 5.5 16.5  
Difference between carrying amount and underlying equity   0.8   0.8    
Tres Palacios Holdings LLC            
Schedule of Equity Method Investments [Line Items]            
Proceeds from equity method investments       5.8 6.2  
Investment   34.7   34.7   39.0
Earnings from unconsolidated affiliates, net   0.3 0.8 1.5 (0.7)  
Difference between carrying amount and underlying equity   26.9   26.9    
Powder River Basin Industrial Complex, LLC            
Schedule of Equity Method Investments [Line Items]            
Proceeds from equity method investments       1.1 1.6  
Investment   8.6   8.6   8.7
Earnings from unconsolidated affiliates, net   0.5 0.3 1.0 1.2  
Difference between carrying amount and underlying equity   6.5   6.5    
Goodwill impairment           41.3
Equity method investment, excess basis difference adjustment           8.3
Crestwood Permian Basin Holdings LLC            
Schedule of Equity Method Investments [Line Items]            
Proceeds from equity method investments       0.0 0.0  
Investment   114.7   114.7   $ (0.5)
Earnings from unconsolidated affiliates, net   2.8 $ 0.0 2.2 $ 0.0  
Difference between carrying amount and underlying equity   $ 22.0   $ 22.0