7. Investing Activities (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Notes to Financial Statements
Due in one year or less Amortized Cost	$ 292.3
Due after one year through five years Amortized Cost	351.0
Due after five years through ten years Amortized Cost	939.2
Due after ten years Amortized Cost	640.1
CMBS/RMBS/ABS/CDO/CLO(1) Amortized Cost	820.4
Total Amortized Cost	3,043.0
Due in one year or less Fair Value	293.3
Due after one year through five years Fair Value	376.8
Due after five years through ten years Fair Value	1,015.4
Due after ten years Fair Value	679.9
CMBS/RMBS/ABS/CDO/CLO(1) Fair Value	851.8
Available-for-sale debt securities, at fair value	$ 3,217.2	$ 2,512.1