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Acquisitions, Dispositions, and Deconsolidations - Business Acquisition, Pro Forma Information (Details) - KMG - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Business Acquisition [Line Items]    
Net revenue $ 571.8 $ 1,072.4
Net income (loss) from operations 38.9 52.4
Net income (loss) attributable to HC2 Holdings, Inc. $ 89.6 $ 75.7