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Equity | 6 Months Ended
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Jun. 30, 2024
Equity |
Equity | Note 9. Equity ​ Stock-Based Compensation Plans ​ We make annual grants of long-term equity incentive awards to officers and key employees in the forms of service-based restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”) that each have approximately 3-year vesting periods. Each PSU includes the right to receive, based on a sliding scale, up to a maximum of two shares of our common stock for each vested PSU, that is tied to achieving a return on assets target over a 3-year measurement period and continued service. We also grant the non-management members of our Board of Directors fully vested stock awards. The fair values of the RSUs, PSUs and stock awards are determined based on the closing stock price of our common stock on the grant date. ​ A summary of the status of our unvested RSUs and PSUs as of June 30, 2024 and changes during the six months then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | RSU and PSU | ​ | Fair Value
​ | ​ | Aggregate Units | ​ | Per Unit
Unvested at January 1, 2024 | ​ | 437,239 | ​ | $ | 213.06
Granted(1) | ​ | 170,611 | ​ | ​ | 289.07
Vested | ​ | (5,194) | ​ | ​ | 208.03
Cancelled or forfeited | ​ | (27,238) | ​ | ​ | 226.17
Unvested at June 30, 2024 | ​ | 575,418 | ​ | $ | 235.02
Shares reserved for future grants (all plans) | ​ | 1,332,023 | ​ | ​ | ​
(1) | Comprised of 100,669 RSUs and 69,942 PSUs granted in February 2024. The RSUs cliff vest on December 1, 2026 and the PSUs vest upon the completion of a 3-year performance period ending December 31, 2026.
​ As of June 30, 2024, there was $88.0 million of total unrecognized compensation cost related to unvested RSUs and PSUs that is expected to be recognized, net of actual forfeitures and cancellations, over a weighted average period of 1.8 years. ​ Dividends ​ On July 23, 2024, our Board of Directors declared the 2024 third quarter cash dividend of $1.10 per share of common stock, payable on August 30, 2024 to stockholders of record as of August 16, 2024. ​ During the second quarters of 2024 and 2023, we declared and paid quarterly dividends of $1.10 and $1.00 per share, or $62.5 million and $58.6 million in total, respectively. During the six months ended June 30, 2024 and 2023, we declared and paid aggregate quarterly dividends of $2.20 and $2.00 per share, or $125.7 million and $117.6 million in total, respectively. In addition, we paid $2.2 million and $3.0 million in dividend equivalents with respect to vested RSUs and PSUs during the six months ended June 30, 2024 and 2023, respectively. ​ Share Repurchases ​ Our share repurchase activity during the six months ended June 30, 2024 and 2023 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023
​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​
​ | ​ | Shares | ​ | Per Share | ​ | Amount | ​ | Shares | ​ | Per Share | ​ | Amount
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​ | ​ | ​ | ​ | (in millions)
First quarter | ​ | — | ​ | $ | — | ​ | $ | — | ​ | 160,224 | ​ | $ | 242.86 | ​ | $ | 38.9
Second quarter | ​ | 1,804,180 | ​ | ​ | 287.81 | ​ | ​ | 519.3 | ​ | 308,454 | ​ | ​ | 239.55 | ​ | ​ | 73.9
​ | ​ | 1,804,180 | ​ | $ | 287.81 | ​ | $ | 519.3 | ​ | 468,678 | ​ | $ | 240.68 | ​ | $ | 112.8
​ Our share repurchase amounts do not include the taxes we paid of $24.1 million and $37.3 million during the six months ended June 30, 2024 and 2023, respectively, for shares withheld to settle our employees’ tax withholding obligations related to net share settlements upon the vesting of RSUs and PSUs. ​ Subsequent to quarter end, we repurchased an additional 637,669 shares at an average cost of $285.36, for a total of $182.0 million, resulting in $738.5 million remaining as of July 25, 2024 under our $1.5 billion share repurchase program authorized by our Board of Directors effective October 30, 2023. The share repurchase program does not obligate us to repurchase any specific number of shares, does not have a specific expiration date and may be suspended or discontinued at any time. Repurchased and subsequently retired shares are restored to the status of authorized but unissued shares. ​ Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss included the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension and | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | Loss
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2024 | $ | (75.7) | ​ | $ | (1.0) | ​ | $ | (76.7)
Current-period change | ​ | (23.1) | ​ | ​ | (1.7) | ​ | ​ | (24.8)
Balance as of June 30, 2024 | $ | (98.8) | ​ | $ | (2.7) | ​ | $ | (101.5)
​ Foreign currency translation adjustments have not been adjusted for income taxes. Pension and postretirement benefit plan adjustments are net of taxes of $0.7 million as of June 30, 2024 and December 31, 2023. Pension and postretirement benefit plan adjustments are amortized over service periods and reflected in the amortization of net loss component of our net periodic benefit cost or recognized as a non-operating loss as result of plan settlements. As our pension and postretirement benefit plan obligations are settled, the related income tax effect is released from accumulated other comprehensive loss and included in our income tax provision.

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