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Telford Fire Safety Remediation (Details) - Telford Fire Safety Remediation - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Estimated environmental liability	$ 185,100,000	$ 185,900,000
Additional provision recorded in the period	$ 0

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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