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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 |  |  |  |

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