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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The West Pharmaceutical Services, Inc. 2016 Omnibus Incentive Compensation Plan (the “2016 Plan”) provides for the granting of stock options, stock appreciation rights, restricted stock awards and performance awards to employees and non-employee directors. A committee of the Board of Directors determines the terms and conditions of awards to be granted. Vesting requirements vary by award. At March 31, 2024, there were 1,357,302 shares remaining in the 2016 Plan for future grants. During the three months ended March 31, 2024, we granted 84,140 stock options at a weighted average exercise price of $350.18 per share based on the grant-date fair value of our stock to employees under the 2016 Plan. The weighted average grant date fair value of options granted was $134.81 per share as determined by the Black-Scholes option valuation model using the following weighted average assumptions: a risk-free interest rate of 4.3%; expected life of 6.0 years based on prior experience; stock volatility of 32.0% based on historical data; and a dividend yield of 0.3%. Stock option expense is recognized over the vesting period, net of forfeitures. During the three months ended March 31, 2024, we granted 32,424 stock-settled performance share unit ("PSU") awards at a weighted average grant-date fair value of $350.18 per share to eligible employees. These awards are earned based on the Company's performance against pre-established targets, including annual growth rate of revenue and return on invested capital, over a specified performance period. Depending on the achievement of the targets, recipients of stock-settled PSU awards are entitled to receive a certain numbers of shares of common stock. Shares earned under PSU awards may vary from 0% to 200% of an employee's targeted award. The fair value of stock-settled PSU awards is based on the market price of our stock at the grant date and is recognized as expense over the performance period, adjusted for estimated target outcomes and net of forfeitures. During the three months ended March 31, 2024, we granted 6,571 stock-settled restricted share unit (“RSU”) awards at a weighted average grant-date fair value of $350.18 per share to eligible employees. These awards are earned over a specified performance period. The fair value of stock-settled RSU awards is based on the market price of our stock at the grant date and is recognized as expense over the vesting period, net of forfeitures. Stock-based compensation expense was $5.0 million and $8.5 million for the three months ended March 31, 2024 and 2023, respectively.

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