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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Restricted Stock Unit Activity | The following table summarizes information about vested and nonvested RSUs for 2019:
| RSUs
| Shares (in actual number of shares) |  | Weighted-Average Grant Date Fair Value
Nonvested at January 1 | 1,028,532 |  |  | $ | 46.69 |
Granted (1) | 1,246,040 |  |  | $ | 35.51 |
Vested | (255,243 | ) |  | $ | 35.28 |
Forfeited | (358,126 | ) |  | $ | 41.80 |
Nonvested at December 31 | 1,661,203 |  |  | $ | 40.56 |
(1) The RSUs granted during 2019 are primarily related to our employee annual equity award grant in March 2019 and non-employee director annual equity award grant in January 2019.
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:
| 2019 |  | 2018 |  | 2017
Weighted average grant-date fair value of RSUs granted | $ | 35.51 |  |  | $ | 49.16 |  |  | $ | 43.66 |
Total fair value of RSUs vested (in millions) | $ | 9.0 |  |  | $ | 7.3 |  |  | $ | 2.3 |
Stock Option Activity | The following table summarizes stock option activity during 2019:
| Stock Options
| Shares (in millions) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions)
Options outstanding at January 1 | 3.1 |  |  | $ | 50.20 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (0.4 | ) |  | $ | 33.87 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Expired | (0.1 | ) |  | $ | 55.35 |  |  |  |  |
Options outstanding as of December 31 | 2.6 |  |  | $ | 52.29 |  |  | 4.49 |  | $ | 5.7 |
Options exercisable at December 31 | 2.4 |  |  | $ | 52.28 |  |  | 4.39 |  | $ | 5.7 |
Options exercisable at December 31 and expected to vest thereafter | 2.6 |  |  | $ | 52.29 |  |  | 4.49 |  | $ | 5.7 |
Options available for future grants at December 31 | 3.9 |  |  |  |  |  |  |
Restricted Stock Activity | The following table summarizes information about vested and nonvested restricted stock for 2019:
| Restricted Stock
| Shares (in actual number of shares) |  | Weighted-Average Grant Date Fair Value
Nonvested at January 1 | 70,718 |  |  | $ | 55.38 |
Granted | — |  |  | $ | — |
Vested | (44,406 | ) |  | $ | 56.92 |
Forfeited | (10,045 | ) |  | $ | 52.41 |
Nonvested at December 31 | 16,267 |  |  | $ | 52.53 |
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:
| 2019 |  | 2018 |  | 2017
RSUs | $ | 29.4 |  |  | $ | 21.7 |  |  | $ | 14.2 |
Stock options | 0.9 |  |  | 1.6 |  |  | 3.1 |
Restricted stock | 0.8 |  |  | 2.2 |  |  | 3.3 |
Total stock-based compensation expense | $ | 31.1 |  |  | $ | 25.5 |  |  | $ | 20.6 |
Tax benefit related to stock-based compensation expense | $ | 2.5 |  |  | $ | 3.0 |  |  | $ | 7.8 |

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