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Stock-Based Compensation (Tables)
3 Months Ended
Apr. 02, 2023
Equity [Abstract]  
Compensation Expense Related to Stock-Based Compensation Plans
Stock-based compensation expense was as follows:
Three Months Ended
(In millions)April 2, 2023April 3, 2022
Cost of sales$1.0 $0.6 
Research and development1.3 1.1 
Selling, marketing and administrative
7.2 5.3 
Acquisition and integration costs4.5 0.4 
Total stock-based compensation expense$14.0 $7.4 
Estimated Fair Value of Each Stock Option Award
The estimated fair value of each stock option was determined on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions for the option grants:
Three Months Ended
April 2, 2023April 3, 2022
Risk-free interest rate3.63 %1.63 %
Expected option life (in years)5.514.91
Volatility rate57 %58 %
Dividend rate%%
Weighted-average grant date fair value$47.83$51.79