8. Investing Activities (Details 5) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Private equity	$ 236.3
Mezzanine funds	195.6
Infrastructure funds	40.0
Hedge funds	13.5
Mortgage and real estate	7.9
Leverage lease	18.3
Direct equity investments	21.6
Life settlements	20.6
Other alternative assets	5.4
Limited partnerships and other investments	559.2	565.3
Amounts applicable to the closed block	342.3
As restated and amended [Member]
Private equity		233.0
Mezzanine funds		191.9
Infrastructure funds		35.4
Hedge funds		14.9
Mortgage and real estate		12.4
Leverage lease		24.1
Direct equity investments		28.5
Life settlements		21.1
Other alternative assets		4.0
Limited partnerships and other investments		565.3
Amounts applicable to the closed block		$ 338.0