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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary Information for Restricted Stock Awards and Incentive Compensation Stock Awards | The following table summarizes information for restricted stock awards and incentive compensation stock awards for 2021:
|  | Restricted Stock - Service Based |  |  | Restricted Stock - Performance Based |  |  | Incentive Compensation Stock |
|  | Number of Awards |  |  | Weighted- Average Grant-Date Fair Value |  |  | Number of Awards |  |  | Weighted- Average Grant-Date Fair Value |  |  | Number of Awards |  |  | Weighted- Average Grant-Date Fair Value |
January 1, 2021 |  |  | 206,981 |  |  | $ | 198.28 |  |  |  | 118,576 |  |  | $ | 228.15 |  |  |  | 42,623 |  |  | $ | 223.85 |
Awarded |  |  | 68,393 |  |  | $ | 342.11 |  |  |  | 35,067 |  |  | $ | 352.52 |  |  |  | 18,722 |  |  | $ | 325.30 |
Distributed |  |  | (56,710 | ) |  | $ | 217.49 |  |  |  | (67,451 | ) |  | $ | 219.88 |  |  |  | (23,317 | ) |  | $ | 199.79 |
Forfeited |  |  | (2,589 | ) |  | $ | 278.74 |  |  |  | (1,777 | ) |  | $ | 267.58 |  |  |  | (170 | ) |  | $ | 258.67 |
Adjustment for performance |  |  | — |  |  | $ | — |  |  |  | 33,908 |  |  | $ | 219.88 |  |  |  | — |  |  | $ | — |
December 31, 2021 |  |  | 216,075 |  |  | $ | 237.80 |  |  |  | 118,323 |  |  | $ | 266.76 |  |  |  | 37,858 |  |  | $ | 288.68 |
Summary Information for Stock Options | The following table includes summary information for stock options as of December 31, 2021:
|  | Number of Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (years) |
Outstanding at January 1, 2021 |  |  | 31,089 |  |  | $ | 129.00 |  |  |  |  |
Exercised |  |  | (10,385 | ) |  | $ | 120.89 |  |  |  |  |
Terminated |  |  | (140 | ) |  | $ | 57.71 |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 20,564 |  |  | $ | 133.59 |  |  |  | 2.6 |
Exercisable at December 31, 2021 |  |  | 20,564 |  |  | $ | 133.59 |  |  |  | 2.6 |
Schedule of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense for the years ended December 31, 2021, 2020 and 2019, unrecognized compensation cost for nonvested awards at December 31, 2021 and the weighted-average period over which unrecognized compensation cost will be recognized:
(in millions, except year data) |  | Stock Options |  |  | Restricted Stock |  |  | Incentive Compensation Stock |  |  | Directors’ Awards |  |  | Total |
Stock-based compensation expense recognized for years ended December 31: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 |  | $ | — |  |  | $ | 41.4 |  |  | $ | 1.0 |  |  | $ | 0.6 |  |  | $ | 43.0 |
2020 |  | $ | — |  |  | $ | 28.5 |  |  | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 30.0 |
2019 |  | $ | 0.1 |  |  | $ | 32.6 |  |  | $ | 0.8 |  |  | $ | 0.6 |  |  | $ | 34.1 |
Unrecognized compensation cost at December 31, 2021 |  | $ | — |  |  | $ | 36.9 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 37.8 |
Weighted-average period over which unrecognized compensation cost will be recognized |  |  |  |  |  | 2.3 years |  |  | 1.6 years |  |  |  |  |  |  |  |  |
Stock-Based Compensation Expense in Future for Outstanding Awards | The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2021:
(in millions) |  |  |  |
2022 |  | $ | 21.9 |
2023 |  |  | 11.8 |
2024 |  |  | 2.4 |
2025 |  |  | 1.2 |
2026 |  |  | 0.5 |
Total |  | $ | 37.8 |

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