Schedule I Summary of Investments (Tables)

12 Months Ended

Dec. 31, 2011

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	$	1,005.8	$	1,304.4	$	1,304.4
States, Municipalities, and Political Subdivisions	1,377.8		1,591.6		1,591.6
Foreign Governments	1,139.4		1,376.7		1,376.7
Public Utilities	9,015.7		10,633.3		10,633.3
Mortgage/Asset-Backed Securities	2,634.6		2,973.2		2,973.2
All Other Corporate Bonds	21,411.6		24,550.1		24,550.1
Redeemable Preferred Stocks	55.8		57.4		57.4
Total	36,640.7		$	42,486.7	42,486.7
Mortgage Loans	1,612.3				1,612.3
Policy Loans	3,051.4				3,051.4
Other Long-term Investments
Derivatives	—				137.7		(2)
Equity Securities	11.1				11.2
Miscellaneous Long-term Investments	482.1				490.3		(3)
Short-term Investments	1,423.5				1,423.5
	$	43,221.1			$	49,213.1