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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Debt Instrument [Line Items]      
Less: deferred financing costs, net $ 24.3 $ 29.1  
Total debt 2,549.1 2,328.5  
Less: current portion 0.2 0.2  
Total long-term debt, less current portion 2,548.9 2,328.3  
Senior Notes | 2023 Senior Notes      
Debt Instrument [Line Items]      
Senior notes 693.2 700.0  
Senior Notes | 2025 Senior Notes      
Debt Instrument [Line Items]      
Senior notes 500.0 500.0  
Senior Notes | 2027 Senior Notes      
Debt Instrument [Line Items]      
Senior notes 600.0 600.0 $ 600.0
Other      
Debt Instrument [Line Items]      
Other 0.4 0.6  
Revolving Credit Facility | Crestwood Midstream Revolver      
Debt Instrument [Line Items]      
Credit Facility $ 779.8 $ 557.0