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Segment Information - Reconciliation of Assets to Consolidated (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 5,744.3	$ 5,953.7
Seaborne Mining
Segment Reporting Information [Line Items]
Total assets	2,466.8	2,465.3
US Thermal Mining
Segment Reporting Information [Line Items]
Total assets	1,296.6	1,346.9
Corporate and Other (1)
Segment Reporting Information [Line Items]
Total assets	$ 1,980.9	$ 2,141.5

X

- Definition

Amount of asset recognized for present right to economic benefit.

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