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Stockholders' Equity and Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2025
Stockholders' Equity and Earnings Per Common Share [Abstract] |
Schedule of Basic and Diluted Earnings Per Share | Net income per common share is determined as follows:
| Year Ended December 31
| 2025 |  | 2024 |  | 2023
| (in millions of dollars, except share data)
Numerator |  |  |  |  |
Net Income | $ | 738.5 |  |  | $ | 1,779.1 |  |  | $ | 1,283.8 |
Denominator (000s) |  |  |  |  |
Weighted Average Common Shares - Basic | 172,511.5 |  |  | 187,497.7 |  |  | 196,659.7 |
Dilution for Assumed Exercises of Nonvested Stock Awards | 410.1 |  |  | 571.5 |  |  | 942.3 |
Weighted Average Common Shares - Assuming Dilution | 172,921.6 |  |  | 188,069.2 |  |  | 197,602.0 |
Net Income Per Common Share |  |  |  |  |
Basic | $ | 4.28 |  |  | $ | 9.49 |  |  | $ | 6.53 |
Assuming Dilution | $ | 4.27 |  |  | $ | 9.46 |  |  | $ | 6.50 |
Treasury Stock Transactions | As part of our capital deployment strategy, we may repurchase shares of Unum Group's common stock, as authorized by our board of directors. The timing and amount of repurchase activity is based on market conditions and other considerations, including the level of available cash, alternative uses for cash, and our stock price. Our board of directors has authorized the following repurchase programs:
| December 2025 Authorization |  | February 2025 Authorization 1 |  | July 2024 Authorization 2 |  | October 2023 Authorization 3 |  | December 2022 Authorization 4
| (in millions)
Effective Date | January 1, 2026 |  | April 1, 2025 |  | August 1, 2024 |  | January 1, 2024 |  | January 1, 2023
Expiration Date | None |  | December 31, 2025 |  | March 31, 2025 |  | July 31, 2024 |  | December 31, 2023
Authorized Repurchase Amount | $ | 1,000.0 |  |  | $ | 1,000.0 |  |  | $ | 1,000.0 |  |  | $ | 500.0 |  |  | $ | 250.0 |
Cost of Shares Repurchased Under Repurchase Program | — |  |  | 800.0 |  |  | 706.8 |  |  | 464.2 |  |  | 250.0 |
Unused and Expired | — |  |  | 200.0 |  |  | 293.2 |  |  | 35.8 |  |  | — |
Remaining Repurchase Amount at December 31, 2025 | Not yet effective |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
1 Concurrent with the announcement of the December 2025 repurchase program, we also announced the termination of the February 2025 program as of December 31, 2025, and any unused amounts under that program expired as of that date. 2 Concurrent with the announcement of the February 2025 repurchase program, we also announced the termination of the July 2024 program as of March 31, 2025, and any unused amounts under that program expired as of that date. 3 Concurrent with the announcement of the July 2024 repurchase program, we also announced the termination of the October 2023 program as of July 31, 2024, and all unused amounts under that program expired as of that date. 4 In February 2023, the December 2022 program was modified to increase the authorized repurchase amount from $200.0 million to $250.0 million. In August 2022, the Inflation Reduction Act was signed into law in the U.S. and imposed a one percent excise tax on corporate stock repurchases effective January 1, 2023. This excise tax is recorded as part of the cost basis of treasury stock and is assessed on the fair market value of stock repurchases reduced by the fair market value of any shares issued during the period. Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:
| Year Ended December 31
| 2025 |  | 2024 |  | 2023
| (in millions)
Shares Repurchased 1 | 13.6 |  |  | 15.7 |  |  | 5.7 |
Cost of Shares Repurchased 2 | $ | 1,011.7 |  |  | $ | 979.3 |  |  | $ | 252.0 |
1 For the year ended December 31, 2025, includes 0.7 million shares related to the settlement of the November 2024 accelerated share repurchase agreement (ASR) which occurred in February 2025. 2 Includes $1.9 million of commissions for the year ended December 31, 2025, a de minimis amount of commissions for the year ended December 31, 2024, and $0.1 million of commissions for the year ended December 31, 2023. Also includes $9.8 million, $8.3 million, and $1.9 million of excise tax for the years ended December 31, 2025, 2024, and 2023 respectively. For the year ended December 31, 2024, includes $80.3 million related to shares which settled in February 2025 in connection with the November 2024 ASR. As a part of our share repurchase program, we periodically enter into ASRs. Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. Details of our ASRs are as follows:
Prepayment Date |  | Prepayment Amount |  | Initial Share Delivery |  | Forward Contract Settlement Date |  | Shares Delivered to Settle Forward Contract
(in millions)
November 2024 |  | $321.0 |  | 3.8 |  | February 2025 1 |  | 0.7
October 2024 |  | $150.0 |  | 1.9 |  | December 2024 |  | 0.3
July 2024 |  | $150.0 |  | 2.2 |  | September 2024 |  | 0.6
April 2024 |  | $125.0 |  | 1.7 |  | June 2024 |  | 0.7
January 2024 |  | $100.0 |  | 1.6 |  | March 2024 |  | 0.5
July 2023 |  | $50.0 |  | 0.8 |  | September 2023 |  | 0.2
1 The final price adjustment settlement, along with the delivery of the remaining shares, occurred in February 2025, resulting in the delivery to us of 0.7 million additional shares. As a result of the final settlement occurring subsequent to December 31, 2024, we recorded a decrease to additional paid-in capital within stockholders' equity on our consolidated balance sheet for the value of the shares held back by the counterparty as of December 31, 2024, which was reclassified to treasury stock in the first quarter of 2025 in connection with the final settlement of the agreement. In December 2023, we retired 115.0 million shares of our treasury stock with a total cost of $3,642.5 million.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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