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Commitments and Contingencies (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2015 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Build-to-Suit Lease |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Term of leasing contract | 15 years |  |  |
Other long term liabilities | Build-to-Suit Lease |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Financing obligation |  | $ 23.1 | $ 24.3 | $ 24.7
Other current liabilities | Build-to-Suit Lease |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Financing obligation |  | 1.5 | $ 1.4 | 1.4
Capital Addition Purchase Commitments |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Amount remaining under long-term commitment obligation |  | 105.9 |  |
Amount prepaid under long-term commitment obligation |  | $ 10.5 |  |
Legal Claim 2015 | Plant Nutrient |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Loss contingency reserve |  |  |  | $ 2.2

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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