Accounts and Other Receivables (Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 39.0	$ 37.0
Change in Provision	(6.5)	3.2	$ (3.4)
Less: Net Charge-offs/(Recoveries) and Other	22.0	1.2
Ending balance	10.5	39.0	37.0
Trade accounts receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17.8	15.0
Change in Provision	(5.8)	4.0
Less: Net Charge-offs/(Recoveries) and Other	1.5	1.2
Ending balance	10.5	17.8	15.0
Trade accounts receivable | COVID-19
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Change in Provision				$ 6.0
Trade accounts receivable | Macroeconomic Items
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Change in Provision	4.0
Other notes receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21.2	22.0
Change in Provision	(0.7)	(0.8)
Less: Net Charge-offs/(Recoveries) and Other	20.5	0.0
Ending balance	$ 0.0	$ 21.2	$ 22.0