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Equity-method investments Additional Information (Details) (HC2 Holdings Inc. [Member], USD $) | Sep. 30, 2014 | Jan. 03, 2014
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HC2 Holdings Inc. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Quoted Market Value | $ 26.5 |
Business Acquisition, Percentage of Voting Interests Acquired | 24.70% | 40.50%

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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