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Investments in Unconsolidated Affiliates Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2016
Oct. 31, 2016
Apr. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 03, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]                  
Net proceeds from sale of assets     $ 945.0     $ 943.1 $ 2.9    
Investment in unconsolidated affiliates (Note 4)       $ 1,099.2   1,099.2     $ 254.3
Payments to acquire equity method investments           6.2 40.0    
Deconsolidation, Gain (Loss), Amount           $ 32.9      
Jackalope Gas Gathering Services, L.L.C.                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage       50.00%   50.00%      
Investment in unconsolidated affiliates (Note 4)       $ 199.7   $ 199.7     202.4
Proceeds from equity method investments           19.9 8.7    
Amortization       $ 0.1 $ 0.8 $ 0.1 2.3    
Tres Palacios Holdings LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage       50.01%   50.01%      
Investment in unconsolidated affiliates (Note 4)       $ 35.4   $ 35.4     36.8
Proceeds from equity method investments           6.2 4.0    
Payments to acquire equity method investments           5.5 5.7    
Amortization       $ 0.3 0.3 $ 0.9 0.9    
Powder River Basin Industrial Complex, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage       50.01%   50.01%      
Investment in unconsolidated affiliates (Note 4)       $ 14.7   $ 14.7     15.1
Proceeds from equity method investments           1.6 1.3    
Payments to acquire equity method investments             8.7    
Amortization       $ 0.4   $ 1.2      
Stagecoach Gas Services LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership Percentage       50.00%   50.00%      
Cash Transferred With the Sale of a Business     $ 3.0            
Investment in unconsolidated affiliates (Note 4)       $ 849.4   $ 849.4   $ 844.0 0.0
Proceeds from equity method investments           3.7      
Crestwood Equity Partners LP                  
Schedule of Equity Method Investments [Line Items]                  
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments       8.3 3.4 15.3 7.2    
Crestwood Niobrara LLC | Jackalope Gas Gathering Services, L.L.C.                  
Schedule of Equity Method Investments [Line Items]                  
Payments to acquire equity method investments           0.7 25.4    
Crestwood Midstream Partners LP                  
Schedule of Equity Method Investments [Line Items]                  
Net proceeds from sale of assets           943.1 2.9    
Investment in unconsolidated affiliates (Note 4)       1,099.2   1,099.2     $ 254.3
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments       $ 8.3 $ 3.4 15.3 7.2    
Payments to acquire equity method investments           $ 6.2 $ 39.8    
Subsequent Event | Tres Palacios Holdings LLC                  
Schedule of Equity Method Investments [Line Items]                  
Proceeds from equity method investments   $ 2.3              
Subsequent Event | Powder River Basin Industrial Complex, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Proceeds from equity method investments $ 0.4                
Subsequent Event | Stagecoach Gas Services LLC                  
Schedule of Equity Method Investments [Line Items]                  
Proceeds from equity method investments   $ 12.3