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Stock-Based Compensation Plans | 3 Months Ended
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Mar. 31, 2023
Stock-Based Compensation Plans |
Stock-Based Compensation Plans | 19. Stock-Based Compensation Plans As of March 31, 2023, we had the 2021 Stock Incentive Plan, the 2020 Directors Stock Plan, the 2014 Stock Incentive Plan, the Employee Stock Purchase Plan, the 2014 Directors Stock Plan, the Amended and Restated 2010 Stock Incentive Plan, the 2005 Directors Stock Plan, the Stock Incentive Plan and the Directors Stock Plan (“Stock-Based Compensation Plans”). No new grants will be made under the 2020 Directors Stock Plan, the 2014 Stock Incentive Plan, the 2014 Directors Stock Plan, the Amended and Restated 2010 Stock Incentive Plan, the 2005 Directors Stock Plan, the Stock Incentive Plan or the Directors Stock Plan. Under the terms of the 2021 Stock Incentive Plan, grants may be nonqualified stock options, incentive stock options qualifying under Section 422 of the Internal Revenue Code, restricted stock, restricted stock units, stock appreciation rights, performance shares, performance units or other stock-based awards. To date, we have not granted any incentive stock options, restricted stock or performance units under any plans. As part of our fair value process, we assess the impact of material nonpublic information on our share price or expected volatility, as applicable, at the time of grant. No awards in 2023 required a fair value adjustment. As of March 31, 2023, the maximum number of new shares of common stock available for grant under the 2021 Stock Incentive Plan was 23.0 million. For awards with graded vesting, we use an accelerated expense attribution method. The compensation cost that was charged against net income for stock-based awards granted under the Stock-Based Compensation Plans was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31,
​ |  | 2023 |  | 2022
​ | ​ | (in millions)
Compensation cost | ​ | $ | 28.2 | ​ | $ | 28.4
Related income tax benefit | ​ |  | 7.0 | ​ |  | 6.4
Capitalized as part of an asset | ​ |  | 0.4 | ​ |  | 0.4
​ Nonqualified Stock Options No nonqualified stock options were granted to employees during the three months ended March 31, 2023. As of March 31, 2023, we had $0.5 million of total unrecognized compensation cost related to nonvested stock options. The cost is expected to be recognized over a weighted-average service period of approximately 0.8 years. Performance Share Awards Performance share awards were granted to certain employees under the 2021 Stock Incentive Plan. Total performance share awards granted were 0.3 million for the three months ended March 31, 2023. The performance share awards granted represent initial target awards and do not reflect potential increases or decreases resulting from the final performance results to be determined at the end of the performance period. The actual number of common shares to be awarded at the end of each performance period will range between 0% and 180% of the initial target awards. Effective in 2022, we added a relative total shareholder return modifier to the performance share awards under which the number of shares ultimately granted is also impacted by our actual shareholder return relative to our S&P 500 Financial Sector Index peer group. The fair value of performance share awards is determined using a Monte Carlo simulation model. The weighted-average grant date fair value of these performance share awards granted was $91.47 per common share. As of March 31, 2023, we had $31.5 million of total unrecognized compensation cost related to nonvested performance share awards granted. The cost is expected to be recognized over a weighted-average service period of approximately 1.9 years. Restricted Stock Units Restricted stock units were issued to certain employees and non-employee directors pursuant to the 2021 Stock Incentive Plan. Total restricted stock units granted were 0.9 million for the three months ended March 31, 2023. The fair value of restricted stock units is determined based on the closing stock price of our common shares on the grant date. The weighted-average grant date fair value of these restricted stock units granted was $88.66 per common share. As of March 31, 2023, we had $123.9 million of total unrecognized compensation cost related to nonvested restricted stock unit awards granted. The cost is expected to be recognized over a weighted-average period of approximately 2.0 years. Employee Stock Purchase Plan Under the Employee Stock Purchase Plan, employees purchased 0.2 million shares for the three months ended March 31, 2023. The weighted average fair value of the discount on the stock purchased was $7.43 per share. As of March 31, 2023, a total of 3.3 million of new shares were available to be made issuable by us for this plan.

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