Schedule I Summary of Investments

12 Months Ended

Dec. 31, 2012

Schedule I - Summary of Investments [Abstract]

Summary of Investment Holdings, Schedule of Investments [Text Block]

SCHEDULE I--SUMMARY OF INVESTMENTS -

OTHER THAN INVESTMENTS IN RELATED PARTIES

Unum Group and Subsidiaries

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

(1) Amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and accretion of discounts.

(2) Derivatives are carried at fair value.

(3) Difference between amortized cost and carrying value primarily results from changes in our partnership owner's equity since acquisition.