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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Current assets [1] $ 1,471.4 $ 1,659.4
Total Assets 22,778.6 22,040.5
Current liabilities 2,246.6 2,279.4
Asset retirement obligations 427.9 477.1
Other noncurrent liabilities 527.4 515.5
Rosewater    
Variable Interest Entity [Line Items]    
Net Property, Plant and Equipment 171.6 175.6
Current assets 5.3 1.7
Total Assets 176.9 177.3
Current liabilities 3.1 15.3
Asset retirement obligations 5.7 5.5
Other noncurrent liabilities 0.1 0.1
Total liabilities $ 8.9 $ 20.9
[1] (1)Includes $171.6 million and $175.6 million of net property, plant and equipment assets and $5.3 million and $1.7 million of current assets of a consolidated VIE as of September 30, 2021 and December 31, 2020 that may be used only to settle obligations of the consolidated VIE. Refer to Note 12 "Variable Interest Entities" for additional information.