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Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Liabilities for Guarantees on Long-Duration Contracts [Line Items]          
Assets supporting fixed indexed annuities, fair value $ 2,800.0   $ 2,800.0   $ 2,600.0
Variable annuity embedded derivative liability 3.1   3.1   6.4
Embedded derivative, gain (loss) 4.2 $ (2.3) (6.0) $ (15.2)  
Fixed Annuity          
Liabilities for Guarantees on Long-Duration Contracts [Line Items]          
Variable annuity embedded derivative liability $ 172.3   $ 172.3   $ 153.9