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Other
 6 Months Ended
Jun. 30, 2021
Debt and Other Disclosures [Abstract]  
Debt
Debt

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.

Also in June 2021, we purchased and retired $500.0 million aggregate principal amount of our 4.500% senior notes due 2025, for which we incurred costs of $67.3 million related to the early retirement of debt.

In July 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 July 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 facility 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 facility provides for borrowings at an interest rate based either on the prime rate or federal funds rate.
Income Tax Disclosure
Income Tax

On June 10, 2021, the Finance Bill 2021 was enacted, resulting in a U.K. tax rate increase from 19 percent to 25 percent, effective April 1, 2023, which resulted in $24.2 million of additional tax expense in operating earnings for the revaluation of our deferred tax assets and liabilities in the second quarter of 2021.
Allowance for Expected Credit Losses on Premiums Receivable
Allowance for Expected Credit Losses on Premiums Receivable

At June 30, 2021, March 31, 2021, and December 31, 2020, the allowance for expected credit losses on premiums receivable was $31.0 million, $33.7 million, and $38.8 million, respectively, on gross premiums receivable of $576.3 million, $602.9 million, and $525.8 million, respectively. The decrease in the allowance of $2.7 million and $7.8 million during the three and six months ended June 30, 2021, respectively, was driven primarily by improvements in the age of premiums due to be collected and improvements in unemployment levels.
At June 30, 2020, March 31, 2020, and January 1, 2020, the allowance for expected credit losses on premiums receivable was $47.5 million, $32.6 million, and $23.8 million, respectively, on gross premiums receivable of $627.0 million, $607.2 million, and $543.0 million, respectively. The increase in the allowance during the three and six months ended June 30, 2020 of $14.9 million and $23.7 million, respectively, was driven primarily by the increase in unemployment levels and the general uncertainty around the financial condition of some of our customers resulting from the impacts of COVID-19.
Lessee, Operating Leases
Impairment Loss on Right-of-Use Asset

During the second quarters of 2021 and 2020, we recognized impairment losses of $13.9 million and $12.7 million, respectively, on the right-of-use (ROU) asset related to one of our operating leases for office space that we do not plan to continue using to support our general operations. The impairment losses were recorded as a result of a decrease in the fair value of the ROU asset compared to its carrying value. The fair value of the ROU asset was determined based on a discounted cash flow model utilizing estimated market rates for sub-lease rentals. The impairment losses for each period are recorded within other expenses in the consolidated statements of income and are included within our Corporate segment.
Reinsurance
Reinsurance

In December 2020, we completed the first phase of a reinsurance transaction, pursuant to which Provident Life and Accident Insurance Company, The Paul Revere Life Insurance Company, and Unum Life Insurance Company of America, wholly-owned domestic insurance subsidiaries of Unum Group, and collectively referred to as "the ceding companies", each entered into separate reinsurance agreements with Commonwealth Annuity and Life Insurance Company (Commonwealth), to reinsure on a coinsurance basis effective as of July 1, 2020, approximately 75 percent of the Closed Block individual disability business, primarily direct business written by the ceding companies. On March 31, 2021, we completed the second phase of the reinsurance transaction, pursuant to which the ceding companies and Commonwealth amended and restated their respective reinsurance agreements to reinsure on a coinsurance and modified coinsurance basis effective as of January 1, 2021, a substantial portion of the remaining Closed Block individual disability business that was not ceded in December 2020, primarily business previously assumed by the ceding companies. Commonwealth established and will maintain collateralized trust accounts for the benefit of the ceding companies to secure its obligations under the reinsurance agreements.

In December 2020, Provident Life and Casualty Insurance Company (PLC), also a wholly-owned domestic insurance subsidiary of Unum Group, entered into an agreement with Commonwealth whereby PLC will provide a 12-year volatility cover to Commonwealth for the active life cohort (ALR cohort). On March 31, 2021, PLC and Commonwealth amended and restated this agreement to incorporate the ALR cohort related to the additional business that was reinsured between the ceding companies and Commonwealth as part of the second phase of the transaction. As part of the amended and restated volatility cover, PLC received a payment from Commonwealth of approximately $18 million. At the end of the 12-year coverage period, Commonwealth will retain the remaining incidence and claims risk on the ALR cohort of the ceded business.
In connection with the second phase of the reinsurance transaction, Commonwealth paid a total ceding commission to the ceding companies of $18.2 million. The ceding companies transferred assets of $767.0 million, which consisted primarily of cash and fixed maturity securities. In addition, we recognized the following in the first quarter of 2021 related to the second phase:

•Net realized investment gains totaling $67.6 million related to the transfer of investments.
•Increase in benefits and change in reserves for future benefits of $133.1 million resulting from the realization of previously unrealized investment gains and losses recorded in accumulated other comprehensive income.
•Transaction costs totaling $6.2 million.
•Reinsurance recoverable of $990.0 million related to the policies on claim status.
•Payable of $307.2 million related to the portfolio of invested assets associated with the business ceded on a modified coinsurance basis.
•Cost of reinsurance, or prepaid reinsurance premium, of $43.1 million related to the DLR cohort. The total cost of reinsurance recognized on a combined basis for the first and second phases was $854.8 million for which we amortized $19.7 million and $39.7 million during the three and six months ended June 30, 2021.
•Deposit asset of $5.0 million related to the ALR cohort. The total deposit asset recognized on a combined basis for the first and second phases was $91.8 million.