XML 57 R14.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

PROPERTY: | 12 Months Ended
--- | ---
Dec. 31, 2019
PROPERTY: |
PROPERTY: | NOTE 5—PROPERTY: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) |  | 2019 |  | 2018
Buildings and equipment | ​ | $ | 15,016.1 | ​ | $ | 14,294.0
Construction in progress | ​ |  | 1,294.8 | ​ |  | 1,516.9
Mine development | ​ |  | 267.5 | ​ |  | 267.9
Mineral assets | ​ | ​ | 83.2 | ​ | ​ | 83.2
Land, other than mineral | ​ |  | 200.1 | ​ |  | 164.1
Total property | ​ |  | 16,861.7 | ​ |  | 16,326.1
Accumulated depreciation, amortization and depletion | ​ |  | (7,490.7) | ​ |  | (6,922.3)
Total property and mine development, net | ​ | $ | 9,371.0 | ​ | $ | 9,403.8
​ Construction in progress decreased in 2019 as a result of the completion of some of the Company expansion projects. Depreciation and depletion expense for the years ended December 31, 2019, 2018 and 2017, amounted to $759.9 million, $668.9 million and $665.2 million, respectively.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration