11. Separate Accounts, Death Benefits, Other Insurance Benefit Features and Embedded Product Derivatives (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Separate Accounts Death Benefits Other Insurance Benefit Features And Embedded Product Derivatives Details
Debt securities	$ 495.5	$ 515.4
Equity funds	1,902.8	1,883.3
Other	73.1	81.7
Total	$ 2,471.4	$ 2,480.4