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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
VIE Assets and Liabilities [Abstract]      
Net Property, Plant and Equipment $ 16,619.5 $ 16,912.2  
Current assets [1] 1,659.4 1,853.9  
Total Assets 22,040.5 22,659.8 $ 21,804.0
Current liabilities 2,279.4 3,745.8  
Asset retirement obligations 477.1 416.9  
Other noncurrent liabilities 286.1 $ 228.2  
Rosewater      
VIE Assets and Liabilities [Abstract]      
Net Property, Plant and Equipment 175.6    
Current assets 1.7    
Total Assets 177.3    
Current liabilities 15.3    
Asset retirement obligations 5.5    
Other noncurrent liabilities 0.1    
Total liabilities $ 20.9    
[1] (1)Includes $175.6 million of net property, plant and equipment assets and $1.7 million of current assets of a consolidated VIE that may be used only to settle obligations of the consolidated VIE. Refer to Note 4 "Variable Interest Entity" for additional information.