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Equity Method Investments - Textual (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Net (loss) income	$ (42.5)	$ 403.5	$ 815.6
Revenue from physical sale of coal	3,861.5	4,236.7	4,946.7
Equity method investment, current assets	1,558.8	1,780.7
Equity method investment, current liabilities	842.2	827.5
Shoal Creek insurance recovery	$ 0.0	109.5	0.0
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage	25.00%
Percentage Equity Ownership, Unrelated Party	75.00%
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Cash receipts from Middlemount	$ 0.0	0.0
Equity method investment related to Middlemount
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	50.00%
R3 Renewables LLC
Schedule of Equity Method Investments [Line Items]
Contributions to Equity Method Investments		$ 11.3	$ 8.0
Cash receipts from Middlemount Coal Pty Ltd and other investments	$ 11.4

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