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Summary of Significant Accounting Policies - Long-Lived Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment |  |  |
Impairment loss of property, plant and equipment | $ 3.8 | $ 4.2 | $ 16.0
Buildings | Minimum |  |  |
Property, Plant and Equipment |  |  |
Useful lives | 5 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment |  |  |
Useful lives | 50 years |  |
Machinery and equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Useful lives | 3 years |  |
Machinery and equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Useful lives | 20 years |  |

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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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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 + Details
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