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Accounts and Other Receivables (Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 10.5 $ 39.0  
Change in Provision 6.3 (6.5) $ 3.2
Less: Net Charge-offs/(Recoveries) and Other 2.6 22.0  
Ending balance 14.2 10.5 39.0
Trade accounts receivable      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 10.5 17.8  
Change in Provision 6.3 (5.8)  
Less: Net Charge-offs/(Recoveries) and Other 2.6 1.5  
Ending balance 14.2 10.5 17.8
Other notes receivable      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0.0 21.2  
Change in Provision 0.0 (0.7)  
Less: Net Charge-offs/(Recoveries) and Other 0.0 20.5  
Ending balance $ 0.0 $ 0.0 $ 21.2