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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Additional Stock-Based Compensation Disclosures
Stock-based compensation expense and the related tax benefits were as follows:
202020192018
Stock-based compensation expense$308.1 $306.8 $253.5 
Tax benefit64.7 64.4 53.2 
Share-based Compensation Awards, Fair Value Assumptions Used The weighted-average fair values of the SVA units granted during the years ended December 31, 2020, 2019, and 2018 were $139.14, $95.01, and $48.51, respectively, determined using the following assumptions:
(Percents)202020192018
Expected dividend yield2.50 %2.50 %2.50 %
Risk-free interest rate1.38 2.46 2.31 
Volatility20.90 21.00 22.26 
The weighted-average fair value of the RVA units granted during the year ended December 31, 2020 was $179.90, determined using the following assumptions:
(Percents)2020
Expected dividend yield2.50 %
Risk-free interest rate1.38 
Volatility19.89