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Acquisitions, Dispositions, and Deconsolidations - Business Acquisition, Pro Forma Information (Details) - KMG - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Business Acquisition [Line Items]    
Net revenue $ 509.2 $ 1,581.5
Net income (loss) from operations (43.2) 9.2
Net income (loss) attributable to HC2 Holdings, Inc. $ 139.8 $ 215.4