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Asset Retirement Obligation (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
ARO Loss Contingencies [Line Items]
Asset Retirement Obligation, Liabilities Incurred	$ 13.0		$ 10.8
Number Of Consent Decrees	2
Asset Retirement Obligation	$ 1,695.2		1,393.9	$ 1,315.2
Surety Bonds Outstanding Delivered To EPA			243.2
Asset retirement obligations	$ 1,483.2		1,203.7
Number Of Decades Remaining For Trust	3
Asset Retirement Obligation, Liabilities Settled	$ (117.6)		(125.1)
Accretion expense for asset retirement obligations	52.8	$ 50.7	68.0
Asset Retirement Obligation, Revision of Estimate	364.4		167.3
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	(11.3)		(42.3)
Asset retirement obligations	212.0		190.2
Unfavorable Regulatory Action | 2015 Consent Decrees With EPA
ARO Loss Contingencies [Line Items]
Asset retirement obligations, undiscounted			1,600.0
Asset Retirement Obligation	20.0		439.1
Bonnie Facility Trust [Member]
ARO Loss Contingencies [Line Items]
Assets Held-in-trust, Current					$ 21.0
Plant City and Bonnie Facilities
ARO Loss Contingencies [Line Items]
Asset retirement obligations	$ 267.3		$ 251.8

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The face amount of surety bonds provided by the entity as of the balance sheet date, which were issued to provide assurance to EPA in connection with mining reclamation obligations.

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Undiscounted amount of the accrual for environmental loss contingencies.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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