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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock Based Compensation Expense
The following table provides information regarding the Company’s stock-based compensation expense:
Three months ended March 31,
20202019
Stock-based compensation$27.7  $25.3  
Tax effect recognized in net earnings5.8  5.3  
Weighted Average Assumptions Used to Value Option Grants The following weighted average assumptions were used to estimate the fair value of options granted during current and prior year periods using the Black-Scholes option-pricing model:
Three months ended March 31,
20202019
Risk-free interest rate (%)0.83  2.44  
Expected option life (years)5.645.41
Expected volatility (%)20.18  19.24  
Expected dividend yield (%)0.62  0.59