Commitments And Contingencies (Other Contingencies Narrative) (Details) $ in Millions		3 Months Ended	12 Months Ended
	Jun. 21, 2021 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2012 a
Loss Contingencies [Line Items]
Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag			total estimated gross liability	total estimated gross liability
Environmental Loss Contingency, Current, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag			current portion of the total estimated liability	current portion of the total estimated liability
Environmental Claims For Site In Goodyear Arizona
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, revision in estimates		$ 49.0			$ 18.9
Accrual for environmental loss contingencies			$ 24.8	$ 32.3
Accrued environmental loss contingencies, current			$ 7.7	7.1
Loss contingency reimbursement rate			2100.00%
Recorded third-party environmental recoveries receivable			$ 4.8	$ 7.3
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site
Loss Contingencies [Line Items]
Approximate size of referenced site | a						55,000
Goodyear Site
Loss Contingencies [Line Items]
Proceeds from sale of other real estate	$ 8.7