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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Restricted Stock Unit Activity | The following table summarizes information about vested and nonvested RSUs for 2021:
| RSUs
| Shares (in actual number of shares) |  | Weighted-Average Grant Date Fair Value
Nonvested at January 1 | 1,868,440 |  |  | $ | 41.36 |
Granted | 536,645 |  |  | $ | 85.45 |
Vested | (671,926) |  |  | $ | 43.75 |
Forfeited | (76,713) |  |  | $ | 45.92 |
Nonvested at December 31 | 1,656,446 |  |  | $ | 54.31 |
Weighted Average Grant-Date Fair Value of Restricted Stock Units Granted and Total Fair Value of Restricted Stock Units Vested | The weighted average grant-date fair value of RSUs and total fair value of RSUs vested are summarized in the following table:
| 2021 |  | 2020 |  | 2019
Weighted average grant-date fair value of RSUs granted | $ | 85.45 |  |  | $ | 44.28 |  |  | $ | 35.51 |
Total fair value of RSUs vested (in millions) | $ | 51.8 |  |  | $ | 23.2 |  |  | $ | 9.0 |
Stock Option Activity | The following table summarizes stock option activity during 2021:
| Stock Options
| Shares (in actual number of shares) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions)
Options outstanding at January 1 | 1,155,693 |  |  | $ | 52.78 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (1,025,673) |  |  | $ | 53.13 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Expired | — |  |  | $ | — |  |  |  |  |
Options outstanding and exercisable as of December 31 | 130,020 |  |  | $ | 50.01 |  |  | 1.97 |  | $ | 8.7 |
Options available for future grants at December 31 | 2,667,548 |  |  |  |  |  |  |
Total Stock-Based Compensation Expense | The following table summarizes the total stock-based compensation expense recognized in Selling, General, and Administrative Expenses in the Consolidated Statements of Income and the total recognized tax benefit related thereto:
| 2021 |  | 2020 |  | 2019
RSUs | $ | 35.0 |  |  | $ | 30.0 |  |  | $ | 29.4 |
Stock options | — |  |  | 0.1 |  |  | 0.9 |
Restricted stock | — |  |  | 0.1 |  |  | 0.8 |
Total stock-based compensation expense | $ | 35.0 |  |  | $ | 30.2 |  |  | $ | 31.1 |
Tax benefit related to stock-based compensation expense | $ | 2.4 |  |  | $ | 2.6 |  |  | $ | 2.5 |

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