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Debt
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Debt ebt consists of the following:
December 31
20212020
Interest RatesMaturities(in millions of dollars)
Outstanding Principal
   Senior Notes issued 19986.750 - 7.250%2028$335.8 $335.8 
   Senior Notes issued 20027.375%203239.5 39.5 
   Senior Notes issued 2012 and 20165.750%2042500.0 500.0 
   Senior Notes issued 20144.000%2024350.0 350.0 
   Senior Notes issued 20153.875%2025275.0 275.0 
   Senior Notes issued 20194.000%2029400.0 400.0 
   Senior Notes issued 20194.500%2049450.0 450.0 
   Senior Notes issued 20204.500%2025— 500.0 
   Senior Notes issued 20214.125%2051600.0 — 
   Medium-term Notes issued 1990 - 19967.000 - 7.190%
2023 - 2028
20.5 20.5 
   Junior Subordinated Debt Securities issued 19987.405%2038203.7 203.7 
   Junior Subordinated Debt Securities issued 20186.250%2058300.0 300.0 
Less:
Unamortized Net Premium2.3 6.0 
Unamortized Debt Issuance Costs(34.6)(34.8)
Total Long-term Debt $3,442.2 $3,345.7 

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

The aggregate contractual principal maturities are $2.0 million in 2023, $350.0 million in 2024, $275.0 million in 2025, and $2,847.5 million thereafter.

Unsecured Notes

In June 2021, we issued $600.0 million of 4.125% senior notes due 2051. The notes are callable at or above par and rank equally in the right of payment with all of our other unsecured and unsubordinated debt.

In September 2020, our $400.0 million 5.625% senior unsecured notes matured.

In May 2020, we issued $500.0 million of 4.500% senior notes due 2025. In June 2021, we purchased and retired these senior notes, for which we incurred costs of $67.3 million and has been recorded within cost related to the early retirement of debt in the consolidated statements of income and is included within our Corporate segment.

During 2019 we purchased and retired (i) $30.3 million aggregate principal amount of our 7.190% medium-term notes due 2028; (ii) $30.0 million aggregate principal amount of our 7.250% senior notes due 2028; and (iii) $350.0 million aggregate principal amount of our 3.000% senior notes due 2021, for which we incurred costs of $27.3 million and has been recorded within cost related to the early retirement of debt in the consolidated statements of income and is included within our Corporate segment.

In September 2019, we issued $450.0 million of 4.500% senior notes due 2049. The notes are callable at or above par and rank equally in the right of payment with all of our other unsecured and unsubordinated debt.
In June 2019, we issued $400.0 million of 4.000% senior notes due 2029. The notes are callable at or above par and rank equally in the right of payment with all of our other unsecured and unsubordinated debt.

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, bearing interest at a floating rate equal to the three month LIBOR plus 0.78% (the Northwind notes) in a private offering.

Northwind Holdings made periodic principal payments on the Northwind notes of $45.0 million in 2020 and $60.0 million in 2019. In December 2020, Northwind Holdings redeemed the remaining $35.0 million of principal on the Northwind notes, and was released of any contractual collateral requirements.

Fair Value Hedges

As of December 31, 2019, we had $250.0 million notional amount of an interest rate swap which effectively converted certain of our unsecured senior notes into floating rate debt. Under this agreement, we received a fixed rate of interest and paid a variable rate of interest, based off of three-month LIBOR. During 2020, the $250.0 million notional amount of the interest rate swap matured in conjunction with the maturity of the hedged debt. See Note 4 for further information on the interest rate swap.

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 due 2038 in a public offering. These capital securities 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. In connection with the capital securities offering, Unum Group issued to the Trust 7.405% junior subordinated deferrable interest debentures due 2038. The Trust is a variable interest entity of which Unum Group is not the primary beneficiary. Accordingly, the capital securities issued by the Trust are not included in our consolidated financial statements and our liability represents the junior subordinated debt securities owed to the trust which is recorded in long-term debt. The sole assets of the Trust are the junior subordinated debt securities. The retirement of any liquidation amount regarding the capital securities by the Trust results in a corresponding retirement of principal amount of the junior subordinated debt securities.

During 2019, the Trust purchased and retired $22.8 million aggregate liquidation amount of the 7.405% capital securities due 2038, which resulted in our purchase and retirement of a corresponding principal amount of our 7.405% junior subordinated debt securities due 2038.

Interest Paid

Interest paid on long-term and short-term debt and related securities during 2021, 2020, and 2019 was $181.6 million, $178.1 million, and $172.9 million, respectively.

Credit Facilities

We have access to two separate unsecured revolving credit facilities, each with a different syndicate of lenders. One of our credit facilities is under a five-year agreement and is effective through April 2024. The terms of this agreement provide for a borrowing capacity of $500.0 million with an option to be increased up to $700.0 million. We may also request, on up to two occasions, that the lenders' commitment termination dates be extended by one year. The credit facility provides for the issuance of letters of credit subject to certain terms and limitations. At December 31, 2021, letters of credit totaling $0.4 million had been issued from this credit facility, but there were no borrowed amounts outstanding.

In the third quarter of 2021, we terminated our three-year, $100.0 million unsecured revolving credit facility, which was originally set to expire in April 2022. There were no letters of credit issued from the credit facility and there were no borrowed amounts outstanding at the time of termination. Also in the third quarter of 2021, we entered into a new five-year, £75 million unsecured standby letter of credit facility with the same syndicate of lenders, pursuant to which a syndicated letter of credit was issued in favor of Unum Limited (as beneficiary), our U.K. insurance subsidiary, and is available for drawings up to £75 million
until its scheduled expiration in July 2026. No amounts have been drawn on the letter of credit. If drawings are made in the future, we may elect to borrow such amounts from the lenders pursuant to term loans made under the credit facility.

Borrowings under the credit facilities are subject to financial covenants, negative covenants, and events of default that are customary. The two primary financial covenants include limitations based on our leverage ratio and consolidated net worth. We are also subject to covenants that limit subsidiary indebtedness. The credit facilities provide for borrowings at an interest rate based either on the prime rate or federal funds rate.

Facility Agreement for Contingent Issuance of Senior Notes

During November 2021, we entered into a 20-year facility agreement with a Delaware trust in connection with the sale by the trust of $400.0 million of pre-capitalized trust securities in a Rule 144A private placement. The trust invested the proceeds from the sale of the trust securities in a portfolio of principal and interest strips of U.S. Treasury securities. The facility agreement provides us the right to issue and sell to the trust, on one or more occasions, up to an aggregate principal amount outstanding at any one time of $400.0 million of our 4.046% senior notes which would be due August 15, 2041 in exchange for a corresponding amount of U.S. Treasury securities held by the trust. These senior notes will not be issued unless and until the issuance right is exercised. In return, we will pay a semi-annual facility fee to the trust at a rate of 2.225% per year on the unexercised portion of the maximum amount of senior notes that we could issue and sell to the trust and we will reimburse the trust for its expenses. We may also direct the trust to grant the right to exercise the issuance right with respect to all or a designated amount of the senior notes to one or more assignees (who are our consolidated subsidiaries or persons to whom we have an obligation).

The issuance right will be exercised automatically in full upon our failure to make certain payments to the trust, such as paying the facility fee or reimbursing the trust for its expenses, if the failure to pay is not cured within 30 days, or upon certain bankruptcy events involving the company. We are also required to exercise the issuance right in full if our consolidated stockholders’ equity, excluding accumulated other comprehensive income, falls below $2.0 billion, subject to adjustment from time to time in certain cases, and upon certain other events described in the facility agreement.

Prior to any involuntary exercise of the issuance right, we have the right to repurchase any or all of the 4.046% senior notes then held by the trust in exchange for U.S. Treasury securities. We may redeem any outstanding 4.046% senior notes, in whole or in part, prior to their maturity. Prior to February 15, 2041, the redemption price will equal the greater of par or a make-whole redemption price. On or after February 15, 2041, any outstanding 4.046% senior notes may be redeemed at par.