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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Additional Stock-Based Compensation Disclosures | Stock-based compensation expense and the related tax benefits were as follows:
| 2021 |  | 2020 |  | 2019
Stock-based compensation expense | $ | 342.8 |  |  | $ | 308.1 |  |  | $ | 306.8 |
Tax benefit | 72.0 |  |  | 64.7 |  |  | 64.4 |
Share-based Compensation Awards, Fair Value Assumptions Used | The weighted-average fair values of the SVA units granted during the years ended December 31, 2021, 2020, and 2019 were $230.19, $139.14, and $95.01, respectively, determined using the following assumptions:
(Percents) | 2021 |  | 2020 |  | 2019
Expected dividend yield | 2.50 | % |  | 2.50 | % |  | 2.50 | %
Risk-free interest rate | 0.19 |  |  | 1.38 |  |  | 2.46 |
Volatility | 31.42 |  |  | 20.90 |  |  | 21.00 |
The weighted-average fair value of the RVA units granted during the years ended December 31, 2021 and 2020 were $286.71 and $179.90, respectively, determined using the following assumptions:
(Percents) | 2021 | 2020
Expected dividend yield | 2.50 | % | 2.50 | %
Risk-free interest rate | 0.19 |  | 1.38 |
Volatility | 30.95 |  | 19.89 |

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