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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Deferred finance costs, net $ 27.5 $ 29.1
Total debt 2,359.1 2,328.5
Less: current portion 0.2 0.2
Total long-term debt, less current portion 2,358.9 2,328.3
Senior Notes | Senior Notes, 2023    
Debt Instrument [Line Items]    
Senior notes 700.0 700.0
Senior Notes | Senior Notes, 2025    
Debt Instrument [Line Items]    
Senior notes 500.0 500.0
Senior Notes | Senior Notes, due 2027    
Debt Instrument [Line Items]    
Senior notes 600.0 600.0
Other    
Debt Instrument [Line Items]    
Other 0.6 0.6
Revolving Credit Facility | Crestwood Midstream Revolver    
Debt Instrument [Line Items]    
Credit Facility $ 586.0 $ 557.0