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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Components of property, plant, and equipment    
Property, plant and equipment, at cost $ 2,155.8 $ 2,010.9
Less accumulated depreciation (901.2) (811.3)
Property, plant, and equipment, net 1,254.6 [1] 1,199.6
Land    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 140.1 138.7
Mineral reserves    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 517.3 506.3
Buildings and improvements    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 327.4 308.3
Machinery and other    
Components of property, plant, and equipment    
Property, plant and equipment, at cost 1,052.1 973.9
Construction in progress    
Components of property, plant, and equipment    
Property, plant and equipment, at cost $ 118.9 $ 83.7
[1] (unaudited)