Commitments and Contingencies (Narrative) (Detail) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 21, 2021 USD ($)	Jul. 31, 2023 plaintiff	Sep. 30, 2014 USD ($)	Dec. 31, 2019 USD ($) component	Jun. 30, 2024 USD ($) a	Dec. 31, 2023 USD ($)
LyondellBasell
Loss Contingencies [Line Items]
Number of victims | plaintiff		56
Environmental Claims For A Site In Goodyear Arizona
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, revision in estimates			$ 49.0	$ 18.9
Number of main remedial components | component				2
Estimated liability					$ 18.1	$ 20.7
Accrued environmental loss contingencies current					$ 7.8	7.8
Loss contingency reimbursement rate					21.00%
Other receivables					$ 3.5	$ 3.8
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 property	$ 8.7