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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 3,184.6 $ 3,058.9
Accumulated depreciation and depletion (1,086.8) (929.5)
Property, plant, and equipment, net 2,097.8 2,129.4
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 197.0 158.3
Mineral reserves    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 1,114.7 1,111.7
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 443.5 366.4
Machinery and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 1,292.9 1,292.8
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 136.5 $ 129.7