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Stockholders' Equity
 3 Months Ended
Mar. 31, 2026
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
(3) Stockholders' Equity
Dividends
On April 10, 2026, our board of directors declared a quarterly dividend of $0.24 per share of common stock to be paid in cash on May 26, 2026 to shareholders of record at the close of business on April 28, 2026.
The following table presents the cash dividends either paid previously or declared by our board of directors for future payment on a per share basis during 2026 and 2025:
20262025
First quarter$0.240 $0.215 
Second quarter0.240 0.220 
Third quarter0.220 
Fourth quarter0.220 
Total$0.480 $0.875 
Stock Options
The following tables summarize the details of options granted under our stock option plans that were outstanding as of March 31, 2026, and the assumptions used to value those grants. All such grants were effective at the close of business on the grant date.
 Options
Granted		Option Exercise
Price		Closing Stock Price on Grant DateMarch 31, 2026
Grant DateOptions
Outstanding		Options
Exercisable
January 2, 20261,508,081 $41.00 $40.440 1,502,232 169,011 
January 2, 20251,366,636 $36.00 $35.555 1,257,104 283,416 
January 2, 20241,629,824 $32.00 $31.775 1,358,624 507,886 
January 3, 20232,143,886 $24.00 $23.700 1,494,697 755,845 
January 3, 20221,426,876 $31.00 $30.990 896,097 616,481 
January 4, 20211,483,020 $24.00 $23.825 783,876 666,394 
January 2, 20201,804,526 $19.00 $18.615 757,796 654,340 
January 2, 20192,633,848 $13.00 $12.853 612,620 541,648 
January 2, 20182,175,872 $13.75 $13.635 298,421 298,421 
January 3, 20173,059,156 $11.75 $11.738 135,509 135,509 
Total19,231,725 9,096,976 4,628,951 
Grant DateRisk-free
Interest Rate		Expected Life
of Option in
Years		Expected
Dividend
Yield		Expected
Stock
Volatility		Estimated Fair
Value of Stock
Option
January 2, 20263.7%5.002.2%23.79%$8.52 
January 2, 20254.3%5.002.2%27.36%$8.86 
January 2, 20243.8%5.002.2%28.44%$7.94 
January 3, 20234.0%5.002.6%29.58%$5.81 
January 3, 20221.3%5.001.7%28.52%$6.84 
January 4, 20210.4%5.002.0%29.17%$4.79 
January 2, 20201.7%5.002.4%25.70%$3.41 
January 2, 20192.5%5.002.9%23.96%$2.20 
January 2, 20182.2%5.002.3%23.45%$2.51 
January 3, 20171.9%5.002.6 %24.49 %$2.10 
All of the options in the tables above vest and become exercisable over a period of up to eight years. Each option will terminate approximately 10 years after the grant date.
The fair value of each share-based option is estimated on the grant date using a Black-Scholes valuation method that uses the assumptions listed above. The risk-free interest rate is based on the United States (U.S.) Treasury rate over the expected life of the option at the time of grant. The expected life is the average length of time over which we expect the employee groups will exercise their options, net of cancellations, which is based on historical experience with similar grants. The dividend yield is estimated over the expected life of the option based on our current dividend payout, historical dividends paid, and expected future cash dividends. Expected stock volatility is based on the movement of our stock price over the most recent historical period equivalent to the expected life of the option.
Compensation expense equal to the grant date fair value is recognized for all of these awards over the vesting period. The stock-based compensation expense for the three-month periods ended March 31, 2026 and 2025 was $2.6 and $2.0, respectively. There is no incremental stock-based compensation expense as a result of the stock split described in Note 1. Unrecognized stock-based compensation expense related to outstanding unvested stock options as of March 31, 2026 was $27.7 and is expected to be recognized over a weighted average period of 4.01 years. Any future changes in estimated forfeitures will impact this amount.
Net Income Per Share
The following tables present a reconciliation of the denominators used in the computation of basic and diluted net income per share and a summary of the options to purchase shares of common stock which were excluded from the diluted net income per share calculation because they were anti-dilutive:
 Three-month Period
Reconciliation20262025
Basic weighted average shares outstanding1,148,159,704 1,146,935,722 
Weighted shares assumed upon exercise of stock options2,740,697 2,576,501 
Diluted weighted average shares outstanding1,150,900,401 1,149,512,223 
 Three-month Period
Summary of Anti-dilutive Options Excluded20262025
Options to purchase shares of common stock1,318,407 2,617,668 
Weighted average exercise prices of options$41.00 33.89 
Any dilutive impact summarized above related to periods when the average market price of our stock exceeded the exercise price of the potentially dilutive stock options then outstanding.