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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jan. 31, 2021
Dec. 31, 2020
Apr. 30, 2019
Debt Instrument [Line Items]        
Obligations under noncompetition agreements and notes to former owners of businesses acquired $ 0.2   $ 0.4  
Less: deferred financing costs, net 29.9   22.6  
Total debt 2,052.3   2,484.0  
Less: current portion 0.2   0.2  
Total long-term debt, less current portion 2,052.1   2,483.8  
Credit Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit agreement outstanding carrying value 282.0   719.0  
2023 Senior Notes | Crestwood Midstream 2022 senior unsecured notes        
Debt Instrument [Line Items]        
Carrying Amount 0.0   687.2  
2025 Senior Notes | Crestwood Midstream 2022 senior unsecured notes        
Debt Instrument [Line Items]        
Carrying Amount 500.0   500.0  
2027 Senior Notes | Crestwood Midstream 2019 Senior Notes        
Debt Instrument [Line Items]        
Carrying Amount 600.0   600.0 $ 600.0
2029 Senior Notes | Crestwood Midstream 2019 Senior Notes        
Debt Instrument [Line Items]        
Carrying Amount $ 700.0 $ 700.0 $ 0.0