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Stock-Based Compensation (Tables) | 12 Months Ended
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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:
| 2020 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 308.1 |  |  | $ | 306.8 |  |  | $ | 253.5 |
Tax benefit | 64.7 |  |  | 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) | 2020 |  | 2019 |  | 2018
Expected dividend yield | 2.50 | % |  | 2.50 | % |  | 2.50 | %
Risk-free interest rate | 1.38 |  |  | 2.46 |  |  | 2.31 |
Volatility | 20.90 |  |  | 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 yield | 2.50 | %
Risk-free interest rate | 1.38 |
Volatility | 19.89 |

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