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Business Combinations Narrative (FCL) (Details) - $ / shares | Mar. 31, 2018 | Dec. 31, 2017
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Business Acquisition [Line Items] |  |
Common stock, par value (in dollars per share) | $ 4 | $ 4

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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