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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property Plant And Equipment
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consist of the following:
 
December 31,
(in millions)
2018
 
2017
Land
$
321.5

 
$
245.9

Mineral properties and rights
4,478.2

 
3,540.4

Buildings and leasehold improvements
2,760.9

 
2,473.0

Machinery and equipment(a)
8,955.7

 
7,933.5

Construction in-progress
2,164.7

 
1,793.0

 
18,681.0

 
15,985.8

Less: accumulated depreciation and depletion
6,934.5

 
6,274.1

 
$
11,746.5

 
$
9,711.7


______________________________
(a)
Includes assets under capital leases of approximately $340.9 million and $345.0 million as of December 31, 2018 and 2017, respectively.
Depreciation and depletion expense was $878.2 million, $659.4 million and $703.8 million for 2018, 2017 and 2016, respectively. Capitalized interest on major construction projects was $22.1 million, $23.9 million and $38.5 million for 2018, 2017 and 2016.