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Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 03, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Jul. 11, 2022
Jul. 10, 2022
Schedule of Equity Method Investments [Line Items]                
Investment   $ 77.1   $ 77.1   $ 119.5    
Earnings from unconsolidated affiliates, net   1.1 $ 3.2 135.2 $ 12.2      
Crestwood Equity Partners LP | Crestwood Permian Basin Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Percentage of voting rights acquired             100.00%  
Crestwood Permian Basin Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Equity interest percentage             50.00%  
Crestwood Permian Basin Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Investment   0.0   0.0   0.0    
Earnings from unconsolidated affiliates, net   0.0 1.3 0.0 8.7      
Ownership percentage               50.00%
Crestwood Permian Basin LLC                
Schedule of Equity Method Investments [Line Items]                
Investment   74.0   74.0   76.5    
Earnings from unconsolidated affiliates, net   1.1 0.7 2.0 0.7      
Ownership percentage             50.00%  
Difference between carrying amount and underlying equity   2.2   2.2        
Amortization   0.1 0.1 0.1 0.1      
Crestwood Permian Basin LLC | Crestwood Permian Basin Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage             50.00%  
Tres Palacios Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Investment   0.0   0.0   39.8    
Earnings from unconsolidated affiliates, net   0.1 1.3 133.6 3.2      
Difference between carrying amount and underlying equity $ 19.9              
Amortization     0.3 0.3 0.9      
Tres Palacios Holdings LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Schedule of Equity Method Investments [Line Items]                
Gain (loss) on sale $ 132.0     132.0        
Powder River Basin Industrial Complex, LLC                
Schedule of Equity Method Investments [Line Items]                
Investment   3.1   3.1   $ 3.2    
Earnings from unconsolidated affiliates, net   $ (0.1) $ (0.1) $ (0.4) $ (0.4)