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Equity Method Investments (Details) $ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 AUD ($)	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 63.1		$ 63.1			$ 56.9
(Loss) income from Equity Method Investments	(6.0)	$ 9.7	(15.1)	$ 13.2
Depreciation, depletion and amortization and asset retirement obligation expenses	88.3	165.4	194.3	337.9
Net interest expense	34.3	36.0	67.4	71.8
Cash receipts from Middlemount Coal Pty			0.0	14.7
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
(Loss) income from Equity Method Investments	(6.0)	$ 9.7	(15.1)	13.5
Cash receipts from Middlemount Coal Pty			$ 0.0	$ 14.7
Intercompany loans					$ 120.0
Financing Receivable, Stated Interest Rate			10.00%
Intercompany loans, carrying value	$ 41.2		$ 41.2			$ 17.5
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%		50.00%

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