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Acquisition (Acquired Identifiable Intangible Assets) (Details) - USD ($) $ in Millions |  | 9 Months Ended
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Sep. 01, 2017 | Sep. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition |  | $ 64.4
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition |  | $ 21.4
Precision Planting LLC [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition | $ 64.4 |
Precision Planting LLC [Member] | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition | $ 21.4 |
Acquired finite-lived intangible assets, weighted average useful life | 14 years |
Precision Planting LLC [Member] | Technology-Based Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition | $ 25.1 |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |
Precision Planting LLC [Member] | Trademarks [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition | $ 17.9 |
Acquired finite-lived intangible assets, weighted average useful life | 20 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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