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Stock compensation plans | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Stock compensation plans | Stock compensation plans In May 2014, our stockholders approved the Teleflex Incorporated 2014 Stock Incentive Plan (the "2014 Plan") which replaced the 2008 Stock Incentive Plan and 2000 Stock Compensation Plan (the "Prior Plans"), under which stock options and restricted stock awards previously were granted. The 2014 Plan provides for several different kinds of awards, including stock options, stock appreciation rights, stock awards and other stock-based awards to directors, officers and key employees. Under the 2014 Plan, we are authorized to issue up to 5.3 million shares of common stock, subject to adjustment in accordance with special share counting rules in the 2014 Plan that, among other things, (i) count shares underlying a stock option or stock appreciation right (each, an "option award") as one share and each share underlying any other type of award (a "stock award") as 1.8 shares, (ii) increase the shares we are authorized to issue by one or 1.8 shares for each share underlying an option award or stock award, respectively, under the Prior Plans that have been canceled, expired, settled in cash or forfeited after December 31, 2013 and (iii) decrease the number of shares we are authorized to issue by one share and 1.8 shares for each share underlying an option award or stock award, respectively, granted under the Prior Plans between January 1, 2014 and the May 2, 2014 adoption of the 2014 Plan by our stockholders. Options granted under the 2014 Plan have an exercise price equal to the closing price of the common stock on the date of the grant. In 2020, we granted, under the 2014 Plan, non-qualified options to purchase 130,206 shares of common stock and granted restricted stock units relating to 52,464 shares of common stock under the 2014 Plan. We also granted performance share units (“PSUs”), as described in the following paragraph. In 2018, we began granting PSUs to specified senior managers. The PSUs are designed to provide further incentive to our senior management with respect to achievement of the long term financial objectives. The PSU component of the equity incentive program is designed to provide shares of our common stock to the holder based upon our achievement of certain financial performance criteria during a designated performance period of three years. The number of shares to be awarded under the PSUs granted are subject to modification based upon our total stockholder return relative to a designated group of public companies. Assuming target performance is achieved, a total of 25,818 shares of common stock would be issuable in respect of the PSUs granted and a maximum of 64,562 shares would be issuable in respect of such PSUs upon achievement of maximum performance levels. The following table summarizes the share-based compensation activity:
| 2020 |  | 2019 |  | 2018
| (Dollars in millions)
Share-based compensation expense | $ | 20.7 |  |  | $ | 26.9 |  |  | $ | 22.4 |
Total income tax benefit recognized for share-based compensation arrangements | 22.0 |  |  | 21.1 |  |  | 20.7 |
Net excess tax benefit | 17.5 |  |  | 15.4 |  |  | 15.9 |
The unrecognized compensation expense for all awards granted in 2020 as of the grant date was $30.4 million, which will be recognized over the vesting period of the awards. As of December 31, 2020, 3,183,199 shares were available for future grants under the 2014 Plan. Option Awards The fair value of options granted in 2020, 2019 and 2018 was estimated at the date of grant using a Black-Scholes option pricing model. The following weighted-average assumptions were used:
| 2020 |  | 2019 |  | 2018
Risk-free interest rate | 1.16 | % |  | 2.44 | % |  | 2.67 | %
Expected life of option | 5.00 years |  | 4.99 years |  | 4.98 years
Expected dividend yield | 0.39 | % |  | 0.47 | % |  | 0.54 | %
Expected volatility | 23.98 | % |  | 23.92 | % |  | 22.65 | %
The following table summarizes the option activity during 2020:
| Shares Subject to Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life In Years |  | Aggregate Intrinsic Value
Outstanding, beginning of the year | 1,325,532 |  |  | $ | 161.91 |  |  |  |  |
Granted | 130,206 |  |  | 347.64 |  |  |  |  |
Exercised | (289,324) |  |  | 106.79 |  |  |  |  |
Forfeited or expired | (9,099) |  |  | 290.49 |  |  |  |  |
Outstanding, end of the year | 1,157,315 |  |  | 195.57 |  |  | 5.71 |  | $ | 249,979 |
Exercisable, end of the year | 903,680 |  |  | $ | 163.27 |  |  | 4.94 |  | $ | 224,388 |
The weighted average grant date fair value for options granted during 2020, 2019 and 2018 was $74.60, $68.22 and $58.16, respectively. The total intrinsic value of options exercised during 2020, 2019 and 2018 was $77.9 million, $64.3 million and $69.4 million, respectively. We recorded $9.4 million of expense related to options during 2020, which is included in cost of goods sold or selling, general and administrative expenses. As of December 31, 2020, the unamortized share-based compensation cost related to non-vested stock options, net of expected forfeitures, was $9.4 million, which is expected to be recognized over a weighted-average period of 1.45 years. Authorized but unissued shares of our common stock are issued upon exercises of options. Stock Awards The fair value of PSUs granted in 2019 was determined using a Monte Carlo simulation valuation model. The grant date fair value for these awards was $362.78. The fair value for restricted stock units granted in 2020, 2019 and 2018 was estimated at the date of grant based on the market price for the underlying stock on the grant date discounted for the risk free interest rate and the present value of expected dividends over the vesting period. The following weighted-average assumptions were used:
| 2020 |  | 2019 |  | 2018
Risk-free interest rate | 1.07 | % |  | 2.41 | % |  | 2.41 | %
Expected dividend yield | 0.38 | % |  | 0.46 | % |  | 0.53 | %
The following table summarizes the non-vested restricted stock unit activity during 2020:
| Number of Non-Vested Shares |  | Weighted Average Grant-Date Fair Value |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
Outstanding, beginning of the year | 177,348 |  |  | $ | 240.17 |  |  |  |  |
Granted | 52,464 |  |  | 344.70 |  |  |  |  |
Vested | (67,851) |  |  | 195.95 |  |  |  |  |
Forfeited | (10,718) |  |  | 285.37 |  |  |  |  |
Outstanding, end of the year | 151,243 |  |  | $ | 293.06 |  |  | 1.2 |  | $ | 62,236 |
We issued 52,464, 69,799 and 62,221 of non-vested restricted stock units in 2020, 2019 and 2018, respectively, the majority of which provide for vesting as to all underlying shares on the third anniversary of the grant date. The weighted average grant-date fair value for non-vested restricted stock units granted during 2020, 2019 and 2018 was $344.70, $286.51 and $250.66, respectively. We recorded $14.8 million of expense related to stock awards during 2020, which is included in cost of goods sold or selling, general and administrative expenses. As of December 31, 2020, the unamortized share-based compensation cost related to non-vested restricted stock units, net of estimated forfeitures, was $16.2 million, which is expected to be recognized over a weighted-average period of 1.2 years. We use treasury stock to provide shares of common stock in connection with vesting of the stock awards.

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