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Acquisitions, Dispositions, and Deconsolidations - Business Acquisition, Pro Forma Information (Details) - KMG America
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]  
Net revenue $ 1,912.1
Net income from operations 249.7
Net income attributable to HC2 Holdings, Inc. $ 203.1