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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Components of property, plant, and equipment    
Property, plant and equipment, at cost $ 3,088.9 $ 3,058.9
Less accumulated depreciation (971.0) (929.5)
Property, plant, and equipment, net 2,117.9 [1] 2,129.4
Land    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 158.0 158.3
Mineral reserves    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 1,113.2 1,111.7
Buildings and improvements    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 369.8 366.4
Machinery and other    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 1,323.4 1,292.8
Construction in progress    
Components of property, plant, and equipment    
Property, plant and equipment, at cost $ 124.5 $ 129.7
[1] (unaudited)