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Financial Instruments and Other Guarantees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jul. 01, 2022	Apr. 01, 2022	Jan. 31, 2022	Dec. 31, 2021	Nov. 06, 2020	Apr. 03, 2017
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	$ 505.4		$ 505.4
Surety bonds amount	1,380.5		1,380.5
Asset retirement obligations	725.8		725.8
Net interest expense	33.8	$ 45.5	110.8	$ 143.3
Surety Bonds Outstanding For Reclamation	1,234.6		1,234.6
Letters of Credit Outstanding for Reclamation	369.9		369.9
Restricted Cash	44.5		44.5
Accrued Reclamation Costs, Current	43.8		43.8					$ 15.0
Collateralized Agreements	60.9		60.9					$ 23.8
Letter of Credit
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	43.2		43.2
Surety Bond
Guarantee Obligations [Line Items]
Transaction support agreements, additional collateral to be posted									$ 75.0
Transaction support agreements, additional collateral to be posted per year through 2025					$ 57.4		$ 38.7		25.0
Debt instrument, transaction support agreements, fair value of second liens on mining equipment									200.0
Transaction support agreements, additional collateral term, free cash flow in any twelve-month period									100.0
Transaction support agreements, additional collateral term, sale of assets benchmark (in excess of)									$ 10.0
Accounts Receivable Securitization Program, April 1, 2022
Guarantee Obligations [Line Items]
Line of credit facility, maximum borrowing capacity						$ 175.0				$ 250.0
Accounts Receivable Securitization Program, April 1, 2022 | Secured debt
Guarantee Obligations [Line Items]
Outstanding borrowings	0.0		0.0
Net interest expense	1.2	$ 1.0	3.4	$ 3.0
Accounts Receivable from Securitization	10.9		10.9
Secured debt | Accounts Receivable Securitization Program, April 1, 2022
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount	164.1		$ 164.1
Secured debt | Accounts Receivable Securitization Program, April 1, 2022 | London Interbank Offered Rate (LIBOR) Swap Rate
Guarantee Obligations [Line Items]
Basis spread on variable rate			2.10%
Letter of Credit
Guarantee Obligations [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250.0		$ 250.0
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding	103.00%		103.00%
Stated interest rate	0.75%		0.75%
Deposit Rate, Percentage, Cash Collateral Posted			0.0224
Letter of Credit | Maximum
Guarantee Obligations [Line Items]
Transaction support agreements, additional collateral demands	$ 5.0		$ 5.0

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