7. Investing Activities (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Notes to Financial Statements
Due in one year or less Amortized Cost	$ 176.0
Due after one year through five years Amortized Cost	325.8
Due after five years through ten years Amortized Cost	832.4
Due after ten years Amortized Cost	582.4
CMBS/RMBS/ABS/CDO/CLO Amortized Cost	885.9
Total Amortized Cost	2,802.5
Due in one year or less Fair Value	177.0
Due after one year through five years Fair Value	349.9
Due after five years through ten years Fair Value	905.8
Due after ten years Fair Value	619.7
CMBS/RMBS/ABS/CDO/CLO Fair Value	913.8
Available-for-sale debt securities, at fair value	$ 2,966.2	$ 2,512.1