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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Components of property, plant, and equipment
The following table summarizes the components of property, plant, and equipment as of December 31, 2019 and 2018.
 
December 31,
2019
 
December 31,
2018
 
(in millions)
Land(1)
$
331.4

 
$
316.5

Buildings and improvements
280.5

 
267.5

Machinery and other
755.7

 
715.9

Construction in progress
38.6

 
28.8

 
1,406.2

 
1,328.7

Less accumulated depreciation and depletion
(590.0
)
 
(525.7
)
 
$
816.2

 
$
803.0


(1) Includes depletable land of $211.0 million as of December 31, 2019 and $201.9 million as of December 31, 2018.