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Equity | 3 Months Ended
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Mar. 31, 2022
Equity |
Equity | Note 9. Equity ​ Dividends ​ On April 26, 2022, our Board of Directors declared the 2022 second quarter cash dividend of $0.8750 per share of common stock, payable on June 10, 2022 to stockholders of record as of May 27, 2022. ​ During the first quarters of 2022 and 2021, we declared and paid quarterly dividends of $0.8750 and $0.6875 per share, or $54.2 million and $43.8 million in total, respectively. In addition, we paid $2.5 million and $1.0 million in dividend equivalents with respect to vested restricted stock units during the quarters ended March 31, 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 quarters ended March 31, 2022 and 2021, we made payments of $17.1 million and $8.2 million, respectively, to tax authorities on our employees’ behalf for shares withheld related to net share settlements. ​ ​ A summary of the status of our unvested RSUs and PSUs as of March 31, 2022 and changes during the quarter then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | Aggregate
​ | ​ | ​ | ​ | Fair Value | ​ | Fair Value
​ | ​ | RSUs and PSUs | ​ | Per RSU | ​ | (in millions)
Unvested at January 1, 2022 | ​ | 831,597 | ​ | $ | 105.12 | ​ | ​ | ​
Granted(1) | ​ | 305,249 | ​ | ​ | 187.31 | ​ | ​ | ​
Vested | ​ | (23,280) | ​ | ​ | 95.87 | ​ | ​ | ​
Cancelled or forfeited | ​ | (18,607) | ​ | ​ | 114.28 | ​ | ​ | ​
Unvested at March 31, 2022 | ​ | 1,094,959 | ​ | $ | 128.07 | ​ | $ | 257.7
Shares reserved for future grants (all plans) | ​ | 1,569,117 | ​ | ​ | ​ | ​ | ​ | ​
(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.
​ As of March 31, 2022, 59,135 equivalent shares of our common stock for vested RSUs and PSUs were unsettled. ​ Share Repurchase Plan ​ On July 20, 2021, our Board of Directors authorized a $1.0 billion share repurchase program. As of March 31, 2022, we had remaining authorization under the plan to repurchase $695.5 million of our common stock. 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. We may repurchase shares through open market purchases, privately negotiated transactions and transactions structured through investment banking institutions under plans relying on Rule 10b5-1 or Rule 10b-18 under the Securities Exchange Act of 1934, as amended. Repurchased and subsequently retired shares are restored to the status of authorized but unissued shares. ​ During the first quarter of 2022, we repurchased 113,529 shares at an average cost of $150.97 per share, for a total of $17.1 million. We had no repurchases of our common stock in the first quarter of 2021. ​ Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss included the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | (Loss) Gain |  | Net of Tax |  | (Loss) Income
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2022 | $ | (55.2) | ​ | $ | (13.7) | ​ | $ | (68.9)
Current-period change | ​ | 0.7 | ​ | ​ | (0.1) | ​ | ​ | 0.6
Balance as of March 31, 2022 | $ | (54.5) | ​ | $ | (13.8) | ​ | $ | (68.3)
​ 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 March 31, 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 settlement loss as a result of a plan termination. ​ ​

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