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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Debt Instrument [Line Items]      
Deferred finance costs, net $ 25,900,000 $ 29,100,000  
Total debt 2,575,900,000 2,328,500,000  
Less: current portion 200,000 200,000  
Total long-term debt, less current portion 2,575,700,000 2,328,300,000  
Senior Notes | Senior Notes, 2023      
Debt Instrument [Line Items]      
Senior notes 700,000,000.0 700,000,000.0  
Senior Notes | Senior Notes, 2025      
Debt Instrument [Line Items]      
Senior notes 500,000,000.0 500,000,000.0  
Senior Notes | Senior Notes, due 2027      
Debt Instrument [Line Items]      
Senior notes 600,000,000.0 600,000,000.0 $ 600,000,000
Other      
Debt Instrument [Line Items]      
Other 600,000 600,000  
Revolving Credit Facility | Crestwood Midstream Revolver      
Debt Instrument [Line Items]      
Credit Facility $ 801,200,000 $ 557,000,000.0