|
|
|
At December 31, |
|
||||
|
(in millions) |
|
2016 |
|
2015 |
|
||
|
Buildings and equipment |
|
$ |
12,177.1 |
|
$ |
11,529.4 |
|
|
Construction in progress |
|
|
1,811.8 |
|
|
1,449.6 |
|
|
Mine development |
|
|
259.1 |
|
|
265.9 |
|
|
Mineral assets |
|
|
83.2 |
|
|
93.0 |
|
|
Land, other than mineral |
|
|
142.1 |
|
|
118.4 |
|
|
|
|
|
|
|
|
|
|
|
Total property |
|
|
14,473.3 |
|
|
13,456.3 |
|
|
Accumulated depreciation, amortization and depletion |
|
|
(5,706.8 |
) |
|
(5,193.5 |
) |
|
|
|
|
|
|
|
|
|
|
Total property and mine development, net |
|
$ |
8,766.5 |
|
$ |
8,262.8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|