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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental reserves, long-term	$ 514.1		$ 514.1		$ 521.3
Recorded Recoveries [Roll Forward]
Environmental recoveries, beginning			3.8
Increase (Decrease) in recoveries			0.4
Cash received			(0.7)
Environmental recoveries, ending	3.5		3.5
Environmental charges, net	4.9	$ 4.8	15.8	$ 13.8
Environmental provision, net	8.5	8.7	26.0	23.3
Continuing Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	4.9	4.8	15.8	13.8
Discontinued Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	3.6	3.9	10.2	9.5
Environmental Provisions, Net - Recorded to Assets
Recorded Recoveries [Roll Forward]
Environmental provision, net	(0.1)	(0.1)	(0.4)	(0.4)
Environmental Provisions, Net - Recorded to Liabilities
Recorded Recoveries [Roll Forward]
Environmental provision, net	8.6	$ 8.8	26.4	$ 23.7
Gross
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2024			623.2
Provision (Benefit)			27.4
(Spending) Recoveries			(55.4)
Foreign currency translation adjustments			13.6
Net change			(14.4)
Total environmental reserves at September 30, 2025	608.8		608.8
Environmental reserves, current	86.5		86.5
Environmental reserves, long-term	522.3		522.3
Total environmental reserves at September 30, 2025	608.8		608.8		623.2
Recoveries
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2024			10.1
Provision (Benefit)			(1.0)
(Spending) Recoveries			1.5
Foreign currency translation adjustments			0.0
Net change			0.5
Total environmental reserves at September 30, 2025	9.6		9.6
Environmental reserves, current	1.4		1.4
Environmental reserves, long-term	8.2		8.2
Total environmental reserves at September 30, 2025	9.6		9.6		10.1
Net
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2024			613.1
Provision (Benefit)			26.4
(Spending) Recoveries			(53.9)
Foreign currency translation adjustments			13.6
Net change			(13.9)
Total environmental reserves at September 30, 2025	599.2		599.2
Environmental reserves, current	85.1		85.1
Environmental reserves, long-term	514.1		514.1
Total environmental reserves at September 30, 2025	$ 599.2		$ 599.2		$ 613.1

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