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Related Party Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 18, 2014
Related Party Transaction [Line Items]          
Long-term Debt $ 6,410.9   $ 6,439.1    
Jefferies [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Consideration Received on Transaction 14.0        
Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party, Noncurrent 185.9   $ 182.6    
HC2 Holdings Inc. [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Consideration Received on Transaction $ 35.1        
Sale of Stock, Number of Shares Issued in Transaction 1,200        
Proceeds from sale of equity securities, price per share $ 7.50        
HC2 Holdings Inc. [Member] | Harbinger Capital Partners [Member]          
Related Party Transaction [Line Items]          
Sale of Stock, Number of Shares Issued in Transaction 540        
Preferred Stock [Member] | HCP Stockholders [Member]          
Related Party Transaction [Line Items]          
Stock Issued During Period, Shares, Acquisitions   23,000      
Share Price         $ 11.00
Stock Issued During Period, Value, Acquisitions   $ 253.0      
Maximum [Member] | Leucadia [Member]          
Related Party Transaction [Line Items]          
Limitation of Sale to Third Partyholders of Common Stock, Percent       4.90%  
Fixed Maturities [Member] | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Net Investment Income $ 2.0