Long-term and short-term debt consists of the following:



	December 31
	2013			2012
	(in millions of dollars)
Long-term Debt
Senior Secured Notes, variable due 2037, callable at or above par	$	440.0		$	500.0
Senior Secured Notes, variable due 2036, callable at or above par	—			62.5
Notes @ 5.75% due 2042, callable at or above par	248.6			248.6
Notes @ 7.375% due 2032, callable at or above par	39.5			39.5
Notes @ 6.75% due 2028, callable at or above par	165.8			165.8
Notes @ 7.25% due 2028, callable at or above par	200.0			200.0
Notes @ 5.625% due 2020, callable at or above par	399.7			399.6
Notes @ 7.125% due 2016, callable at or above par	350.0			350.0
Notes @ 6.85% due 2015, callable at or above par	296.8			296.7
Notes @ 7.0% due 2018, non-callable	200.0			200.0
Medium-term Notes @ 7.0% to 7.2% due 2023 to 2028, non-callable	50.8			50.8
Junior Subordinated Debt Securities @ 7.405% due 2038	226.5			226.5
Fair Value Hedges Adjustment	(5.7		)	15.4
Total	2,612.0			2,755.4
Short-term Debt
Securities Lending Agreements - See Note 3	76.5			455.8
Total	$	2,688.5		$	3,211.2

Collateralized debt is comprised of our senior secured notes and ranks highest in priority, followed by unsecured notes, which consist of notes and medium-term notes, followed by junior subordinated debt securities. The junior subordinated debt securities due 2038 are callable under limited, specified circumstances. The remaining callable debt may be redeemed, in whole or in part, at any time.

The aggregate contractual principal maturities are $296.9 million in 2015, $350.0 million in 2016, $200.0 million in 2018, and $1,772.6 million in 2020 and thereafter.

Senior Secured Notes

In 2007, Northwind Holdings, LLC (Northwind Holdings), a wholly-owned subsidiary of Unum Group, issued $800.0 million of insured, senior secured notes due 2037 (the Northwind notes) in a private offering. The Northwind notes bear interest at a floating rate equal to the three-month LIBOR plus 0.78%.

Northwind Holdings’ ability to meet its obligations to pay principal, interest, and other amounts due on the Northwind notes will be dependent principally on its receipt of dividends from Northwind Reinsurance Company (Northwind Re), the sole subsidiary of Northwind Holdings. Northwind Re reinsured the risks attributable to specified individual disability insurance policies issued by or reinsured by Provident Life and Accident Insurance Company, Unum Life Insurance Company of America, and The Paul Revere Life Insurance Company (collectively, the ceding insurers) pursuant to separate reinsurance agreements between Northwind Re and each of the ceding insurers. The ability of Northwind Re to pay dividends to Northwind Holdings will depend on its satisfaction of applicable regulatory requirements and the performance of the reinsured policies.

Recourse for the payment of principal, interest, and other amounts due on the Northwind notes is limited to the collateral for the Northwind notes and the other assets, if any, of Northwind Holdings. The collateral consists of a first priority, perfected security interest in (a) the debt service coverage account (DSCA) that Northwind Holdings is required to maintain in accordance with the indenture pursuant to which the Northwind notes were issued (the Northwind indenture), (b) the capital stock of Northwind Re and the dividends and distributions on such capital stock, and (c) Northwind Holdings' rights under the transaction documents related to the Northwind notes to which Northwind Holdings is a party. At December 31, 2013, the amount in the DSCA was $7.4 million. None of Unum Group, the ceding insurers, Northwind Re, or any other affiliate of Northwind Holdings is an obligor or guarantor with respect to the Northwind notes.

Northwind Holdings is required to repay a portion of the outstanding principal under the Northwind notes at par on the quarterly scheduled payment dates under the Northwind notes in an amount equal to the lesser of (i) a targeted amortization amount as defined in the Northwind indenture and (ii) the amount of the remaining available funds in the DSCA minus an amount equal to the minimum balance that is required to be maintained in the DSCA under the Northwind indenture, provided that Northwind Holdings has sufficient funds available to pay its other expenses, including interest payments on the Northwind notes, and to maintain the minimum balance in the DSCA as required under the Northwind indenture. Northwind Holdings made principal payments on the Northwind Notes of $60.0 million in both 2013 and 2012 and $74.4 million in 2011.

In 2006, Tailwind Holdings, LLC (Tailwind Holdings) a wholly-owned subsidiary of Unum Group, issued $130.0 million of insured, senior, secured notes due 2036 in a private offering. During 2012 and 2011, Tailwind Holdings made principal payments of $10.0 million each year on these notes. In January 2013, we purchased and retired the outstanding principal of $62.5 million on these notes, resulting in a before-tax gain of $4.0 million.

Unsecured Notes

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering.

In 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

In 2005, UnumProvident Finance Company plc, a wholly-owned subsidiary of Unum Group, issued 6.85% senior debentures due 2015. These debentures are fully and unconditionally guaranteed by Unum Group.

Fair Value Hedges

As of December 31, 2013 and 2012, we had $600.0 million notional amount interest rate swaps which effectively convert certain of our unsecured senior notes into floating rate debt. Under these agreements, we receive fixed rates of interest and pay variable rates of interest, based off of three-month LIBOR. See Note 4 for further information on our interest rate swaps.

Junior Subordinated Debt Securities

In 1998, Provident Financing Trust I (the trust), a 100 percent-owned finance subsidiary of Unum Group, issued $300.0 million of 7.405% capital securities in a public offering. These capital securities, which mature in 2038, are fully and unconditionally guaranteed by Unum Group, have a liquidation value of $1,000 per capital security, and have a mandatory redemption feature under certain circumstances. Unum Group issued 7.405% junior subordinated deferrable interest debentures to the trust in connection with the capital securities offering. The debentures mature in 2038. The sole assets of the trust are the junior subordinated debt securities.

Interest and Debt Expense

Interest paid on long-term and short-term debt and related securities during 2013, 2012, and 2011 was $144.6 million, $139.6 million, and $145.4 million, respectively.

Credit Facility

In August 2013, we entered into a five-year, $400.0 million unsecured revolving credit facility. Under the terms of the agreement, we may request that the credit facility be increased up to $600.0 million. Borrowings under the credit facility are for general corporate uses and are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility provides for interest rates based on either the prime rate or LIBOR. At December 31, 2013, no amount was outstanding on the facility.