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Equity Method Investments (Details) $ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 AUD ($)	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 32.8		$ 32.8			$ 62.2
Income (Loss) from Equity Method Investments	$ (27.5)	$ (15.8)	(120.9)	$ (11.4)
Cash receipts from Middlemount Coal Pty Ltd and other related parties			154.9	8.4
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Cash receipts from Middlemount Coal Pty Ltd and other related parties			$ 151.5	7.6
Equity interest percentage of revolving loans limit	50.00%		50.00%		50.00%
Revolving loan limit					$ 50.0
Financing receivable, stated interest rate (in percent)			10.00%
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 28.4	$ 15.8	$ 123.6	$ 11.4

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