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Property, Plant, and Equipment
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment
The following table summarizes the components of property, plant, and equipment as of June 30, 2019 and December 31, 2018.
 
June 30,
2019
 
December 31,
2018
 
(in millions)
Land(1)
$
332.5

 
$
316.5

Buildings and improvements
273.6

 
267.5

Machinery and other
736.4

 
715.9

Construction in progress
34.7

 
28.8

 
1,377.2

 
1,328.7

Less accumulated depreciation and depletion
(562.9
)
 
(525.7
)
 
$
814.3

 
$
803.0


(1) Includes depletable land of $209.3 million as of June 30, 2019 and $201.9 million as of December 31, 2018.