Schedule I Summary of Investments (Tables)

12 Months Ended

Dec. 31, 2012

Schedule I - Summary of Investments [Abstract]

Investment Holdings, Schedule of Investments [Table Text Block]

Type of Investment	Cost or Amortized Cost (1)		Fair Value		Amount at which shown in the balance sheet
	(in millions of dollars)
Fixed Maturity Securities:
Bonds
United States Government and Government Agencies and Authorities	$	1,020.9	$	1,348.8	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		1,806.8		1,806.8
Foreign Governments	1,280.4		1,507.0		1,507.0
Public Utilities	9,294.3		11,144.2		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		2,216.5		2,216.5
All Other Corporate Bonds	22,696.6		26,910.4		26,910.4
Redeemable Preferred Stocks	33.0		39.3		39.3
Total	37,751.5		$	44,973.0	44,973.0
Mortgage Loans	1,712.7				1,712.7
Policy Loans	3,133.8				3,133.8
Other Long-term Investments
Derivatives	—				81.6		(2)
Equity Securities	11.2				14.6
Miscellaneous Long-term Investments	515.5				528.8		(3)
Short-term Investments	1,460.3				1,460.3
	$	44,585.0			$	51,904.8