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Accounts and Other Receivables (Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 37.0 $ 42.0  
Add: charges 3.2 (3.4) $ 17.1
Less: Net Charge-offs/(Recoveries) and Other 1.2 1.6  
Ending balance 39.0 37.0 42.0
Total trade receivables      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 15.0 19.2  
Add: charges 4.0 (2.6)  
Less: Net Charge-offs/(Recoveries) and Other 1.2 1.6  
Ending balance 17.8 15.0 19.2
Other notes receivable      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 22.0 22.8  
Add: charges (0.8) (0.8)  
Less: Net Charge-offs/(Recoveries) and Other 0.0 0.0  
Ending balance $ 21.2 $ 22.0 $ 22.8