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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]      
Debt Issuance Costs, Net $ 26.4 $ 28.4  
Less: current portion 0.9 0.9  
Total long-term debt 1,752.4 1,491.3  
Crestwood Midstream Revolver | Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit agreement outstanding carrying value 578.2 318.2  
Senior Notes, 2025 | Crestwood Midstream 2019 Senior Notes      
Debt Instrument [Line Items]      
Carrying Amount     $ 500.0
CMLP      
Debt Instrument [Line Items]      
Obligations under noncompetition agreements and notes to former owners of businesses acquired 1.5 2.4  
Debt, Long-term and Short-term, Combined Amount 1,753.3 1,492.2  
Less: current portion 0.9 0.9  
Total long-term debt 1,752.4 1,491.3  
CMLP | Senior Notes, 2023 | Crestwood Midstream 2022 senior unsecured notes      
Debt Instrument [Line Items]      
Carrying Amount 700.0 700.0  
CMLP | Senior Notes, 2025 | Crestwood Midstream 2022 senior unsecured notes      
Debt Instrument [Line Items]      
Carrying Amount $ 500.0 $ 500.0