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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Less: deferred financing costs, net $ 25.6 $ 22.6
Total debt 2,025.1 2,484.0
Less: current portion 0.2 0.2
Total long-term debt, less current portion 2,024.9 2,483.8
Senior Notes | 2023 Senior Notes    
Debt Instrument [Line Items]    
Senior notes 0.0 687.2
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
Senior Notes | Senior Notes, 2029    
Debt Instrument [Line Items]    
Senior notes 700.0 0.0
Other(1)    
Debt Instrument [Line Items]    
Other(1) 0.2 0.4
Revolving Credit Facility | Crestwood Midstream Revolver    
Debt Instrument [Line Items]    
Credit Facility $ 250.5 $ 719.0