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Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Jul. 31, 2021
Schedule of Equity Method Investments [Line Items]            
Investment $ 164.8   $ 164.8   $ 155.8  
Earnings (loss) from unconsolidated affiliates, net 6.0 $ (27.1) 9.0 $ (130.8)    
Crestwood Permian Basin Holdings LLC            
Schedule of Equity Method Investments [Line Items]            
Investment 118.4   118.4   116.1  
Earnings (loss) from unconsolidated affiliates, net 4.8 1.0 7.4 0.2    
Difference between carrying amount and underlying equity 20.9   20.9      
Tres Palacios Holdings LLC            
Schedule of Equity Method Investments [Line Items]            
Investment 43.2   43.2   36.2  
Earnings (loss) from unconsolidated affiliates, net 1.3 (0.1) 1.9 9.2    
Difference between carrying amount and underlying equity 8.2   8.2      
Amortization 0.3 0.3 0.6 0.6    
Powder River Basin Industrial Complex, LLC            
Schedule of Equity Method Investments [Line Items]            
Investment 3.2   3.2   3.5  
Earnings (loss) from unconsolidated affiliates, net (0.1) 0.0 (0.3) 0.1    
Stagecoach Gas Services LLC            
Schedule of Equity Method Investments [Line Items]            
Investment 0.0   0.0   $ 0.0  
Earnings (loss) from unconsolidated affiliates, net $ 0.0 (28.0) $ 0.0 (140.3)    
Difference between carrying amount and underlying equity   51.3   51.3    
Ownership percentage         50.00%  
Equity Method Investment Transaction Costs           $ 3.0
Stagecoach Gas Services LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from unconsolidated affiliates, net   $ 35.5   $ 155.4