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Equity | 9 Months Ended
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Sep. 30, 2022
Equity |
Equity | Note 9. Equity ​ Dividends ​ On October 25, 2022, our Board of Directors declared the 2022 fourth quarter cash dividend of $0.875 per share of common stock, payable on December 2, 2022 to stockholders of record as of November 18, 2022. ​ During the third quarters of 2022 and 2021, we declared and paid quarterly dividends of $0.875 and $0.6875 per share, or $52.5 million and $43.6 million in total, respectively. During the nine months ended September 30, 2022 and 2021, we declared and paid aggregate quarterly dividends of $2.625 and $2.0625 per share, or $160.6 million and $131.2 million in total, respectively. In addition, we paid $2.9 million and $1.1 million in dividend equivalents with respect to vested restricted stock units during the nine months ended September 30, 2022 and 2021, respectively. ​ Stock-Based Compensation ​ We make annual grants of long-term 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 have approximately 3-year vesting periods. The PSUs include the right to receive a maximum payout of two shares of our common stock based on performance goals tied to achieving a three-year return on assets result and include service criteria. We also grant the non- employee members of our Board of Directors stock awards that are fully vested on the grant date. 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. ​ In the nine months ended September 30, 2022 and 2021, we made payments of $21.6 million and $9.2 million, respectively, to tax authorities on our employees’ behalf for shares withheld related to net share settlement of vested RSUs. ​ A summary of the status of our unvested RSUs and PSUs as of September 30, 2022 and changes during the nine months then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | Aggregate
​ | ​ | RSUs and PSUs | ​ | Fair Value | ​ | Fair Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in millions)
Unvested at January 1, 2022 | ​ | 831,597 | ​ | $ | 105.12 | ​ | ​ | ​
Granted(1) | ​ | 305,249 | ​ | ​ | 187.31 | ​ | ​ | ​
Vested | ​ | (25,030) | ​ | ​ | 95.98 | ​ | ​ | ​
Cancelled or forfeited | ​ | (24,461) | ​ | ​ | 117.98 | ​ | ​ | ​
Unvested at September 30, 2022 | ​ | 1,087,355 | ​ | $ | 128.11 | ​ | $ | 170.7
Shares reserved for future grants (all plans) | ​ | 1,592,761 | ​ | ​ | ​ | ​ | ​ | ​
(1) | Comprised of 56,452 RSUs granted in January 2022 with a fair value of $152.21 per unit, and 136,346 RSUs and 112,451 PSUs granted in March 2022 with a fair value of $195.28 per unit. The service-based RSUs cliff vest on December 1, 2024 and the performance-based RSUs are subject to a three-year performance period ending December 31, 2024.
​ Share Repurchases ​ Our share repurchase activity during the nine months ended September 30, 2022 and 2021 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​
​ | ​ | Shares | ​ | Per Share | ​ | Amount | ​ | Shares | ​ | Per Share | ​ | Amount
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​ | ​ | ​ | ​ | (in millions)
First quarter | ​ | 113,529 | ​ | $ | 150.97 | ​ | $ | 17.1 | ​ | — | ​ | $ | — | ​ | $ | —
Second quarter | ​ | 1,085,635 | ​ | ​ | 178.61 | ​ | ​ | 193.9 | ​ | 147,016 | ​ | ​ | 163.50 | ​ | ​ | 24.0
Third quarter | ​ | 1,883,093 | ​ | ​ | 178.79 | ​ | ​ | 336.7 | ​ | 885,606 | ​ | ​ | 147.89 | ​ | ​ | 131.0
​ | ​ | 3,082,257 | ​ | $ | 177.70 | ​ | $ | 547.7 | ​ | 1,032,622 | ​ | $ | 150.12 | ​ | $ | 155.0
​ On July 26, 2022, our Board of Directors amended our share repurchase program to increase the remaining repurchase authorization to $1.0 billion. 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. At September 30, 2022, $763.3 million of our common stock remained authorized for repurchase. ​ Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss included the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | Loss
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2022 | $ | (55.2) | ​ | $ | (13.7) | ​ | $ | (68.9)
Current-period change | ​ | (51.3) | ​ | ​ | 6.3 | ​ | ​ | (45.0)
Balance as of September 30, 2022 | $ | (106.5) | ​ | $ | (7.4) | ​ | $ | (113.9)
​ Foreign currency translation adjustments have not been adjusted for income taxes. Postretirement benefit plan adjustments are net of taxes of $3.3 million as of September 30, 2022 and December 31, 2021. The income tax effects relating to our postretirement benefit plan adjustments are reflected in our income tax provision in future periods as the 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 are otherwise released and recognized as a loss as a result of a plan settlement. ​

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