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Segment and Geographic Information - Reconciliation of Assets by Segment to Consolidated Total Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 5,807.2 $ 5,953.7 $ 5,962.1
Property, plant, equipment and mine development, net 3,153.3 3,081.5 2,844.1
Operating lease right-of-use assets 121.2 119.3 61.9
U.S.      
Segment Reporting, Asset Reconciling Item [Line Items]      
Property, plant, equipment and mine development, net 1,334.4 1,432.1 1,523.1
Operating lease right-of-use assets 96.0 85.6 28.7
Australia      
Segment Reporting, Asset Reconciling Item [Line Items]      
Property, plant, equipment and mine development, net 1,818.9 1,649.4 1,321.0
Operating lease right-of-use assets 25.1 33.7 33.1
Other Countries      
Segment Reporting, Asset Reconciling Item [Line Items]      
Operating lease right-of-use assets 0.1 0.0 0.1
Seaborne Mining [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 2,543.4 2,465.3 2,088.2
U.S Thermal Mining [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 1,301.7 1,346.9 1,373.2
Corporate and Other (1)      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 1,962.1 $ 2,141.5 $ 2,500.7