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Long-Term Debt (Narrative) (Detail)
$ in Millions
3 Months Ended
Feb. 12, 2016
USD ($)
Feb. 13, 2015
USD ($)
Feb. 14, 2014
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Distribution Made to Limited Partner, Cash Distributions Paid $ 95.6 $ 25.8   $ 97.2 $ 26.6  
Senior Secured Leverage Ratio       1.48    
Repayments of Long-term Debt       $ 286.2 1,169.9  
Senior Secured Leverage Ratio, maximum       3.75    
Crestwood Midstream Revolver            
Debt Instrument [Line Items]            
Credit agreement outstanding carrying value       $ 1,000.0    
Consolidated Leverage Ratio Maximum       5.50    
Crestwood Midstream Revolver | Revolving Credit Facility            
Debt Instrument [Line Items]            
Letters of credit outstanding       $ 60.7   $ 62.2
Debt Instrument, Unused Borrowing Capacity, Amount       268.2    
Credit agreement outstanding carrying value       $ 762.8   $ 735.0
Total Funded Debt to Consolidated Ebitda       4.98    
Consolidated Ebitda To Consolidated Interest Expense       3.77    
Debt, Weighted Average Interest Rate       2.96%   2.70%
Interest Coverage Ratio Minimum       2.50    
Crestwood Midstream Revolver | Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Debt, Weighted Average Interest Rate       2.94%   2.70%
Crestwood Midstream Revolver | Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Debt, Weighted Average Interest Rate       5.00%   5.00%
Senior Notes, 2020 | Senior Notes            
Debt Instrument [Line Items]            
Senior notes       $ 500.0   $ 500.0
Senior Notes, 2022 | Senior Notes            
Debt Instrument [Line Items]            
Senior notes       600.0   600.0
Senior Notes, 2023 | Senior Notes            
Debt Instrument [Line Items]            
Senior notes       $ 700.0   700.0
Debt Instrument, Interest Rate, Stated Percentage       6.25%    
Crestwood Midstream Partners LP | Senior Notes, 2023 | Senior Notes            
Debt Instrument [Line Items]            
Long-term Debt       $ 700.0    
Proceeds from Issuance of Debt       688.3    
Crestwood Midstream Partners LP            
Debt Instrument [Line Items]            
Distribution Made to Limited Partner, Cash Distributions Paid     $ 74.3      
Repayments of Long-term Debt       286.0 $ 970.4  
Crestwood Midstream Partners LP | Senior Notes, 2020            
Debt Instrument [Line Items]            
Senior notes       503.2   503.3
Crestwood Midstream Partners LP | Senior Notes, 2022            
Debt Instrument [Line Items]            
Senior notes       600.0   600.0
Crestwood Midstream Partners LP | Senior Notes, 2023            
Debt Instrument [Line Items]            
Senior notes       $ 700.0   $ 700.0