Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives Separate Account Investments of Account Balances of Variable Annuity Contracts with Guarantees (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
Debt securities	$ 322.1	$ 369.3
Equity funds	1,538.7	1,516.3
Other	47.4	49.7
Total	$ 1,908.2	$ 1,935.3