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Property, Plant and Equipment (Footnote) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |
Property, plant and equipment classified as assets held for sale | $ 215.9
Minimum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 2 years
Minimum | Land improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 years
Minimum | Building and improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 years
Minimum | Machinery and equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 2 years
Minimum | Long term mineral rights and production equipment costs |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 7 years
Minimum | Short-lived production equipment components, office and building equipment and other equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 2 years
Minimum | Production process equipment (intermediate components) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 8 years
Minimum | Production process equipment (major unit components) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 20 years
Minimum | Production process equipment (infrastructure and other) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 30 years
Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 60 years
Maximum | Land improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 30 years
Maximum | Building and improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 45 years
Maximum | Machinery and equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 45 years
Maximum | Long term mineral rights and production equipment costs |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 60 years
Maximum | Short-lived production equipment components, office and building equipment and other equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 7 years
Maximum | Production process equipment (intermediate components) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 19 years
Maximum | Production process equipment (major unit components) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 29 years
Maximum | Production process equipment (infrastructure and other) |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 45 years

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- Definition Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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