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Equity Method Investments (Details) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Aug. 31, 2020 AUD ($)	Mar. 31, 2020 AUD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments					$ 47.1	$ 56.9
(Loss) income from Equity Method Investments	$ (9.1)	$ 3.5
Depreciation, depletion and amortization and asset retirement obligation expenses	106.0	172.5
Net interest expense	33.1	35.8
Cash receipts from Middlemount Coal Pty	0.0	1.1
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
(Loss) income from Equity Method Investments	(9.1)	3.8
Cash receipts from Middlemount Coal Pty	$ 0.0	$ 1.1
Intercompany loans				$ 70.0
Financing Receivable, Stated Interest Rate	15.00%
Intercompany loans, carrying value					$ 23.6	$ 17.1
Scenario, Forecast | Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Intercompany loans			$ 50.0
Middlemount Mine
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage				50.00%	50.00%

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