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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Components of Stock-Based Compensation Expense | The following table summarizes the expenses and associated income tax benefits recognized (in millions):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Compensation expense | $ | 27.1 |  |  | $ | 23.3 |  |  | $ | 16.4 |
Income tax benefit | (7.1) |  |  | (6.0) |  |  | (4.2) |
Total | $ | 20.0 |  |  | $ | 17.3 |  |  | $ | 12.2 |
Summary of Stock Option Activity | A summary of option activity is presented below.
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions of dollars)
Outstanding at December 31, 2021 | 96,728 |  |  | $ | 43.48 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (5,661) |  |  | 33.19 |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at December 31, 2022 | 91,067 |  |  | $ | 44.12 |  |  |  |  |
Expected to Vest at December 31, 2022 | — |  |  | $ | — |  |  | — |  |  | $ | — |
Exercisable at December 31, 2022 | 91,067 |  |  | $ | 44.12 |  |  | 1.3 |  | $ | 8.0 |
Schedule of Stock Options by Exercise Price Range | Stock options as of December 31, 2022:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Number Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years)
$30.01-40.00 | 55,653 |  |  | $ | 33.19 |  |  | 0.6 |  | 55,653 |  |  | $ | 33.19 |  |  | 0.6
50.01-60.00 | 27,529 |  |  | 58.78 |  |  | 2.4 |  | 27,529 |  |  | 58.78 |  |  | 2.4
70.01-80.00 | 7,885 |  |  | 70.14 |  |  | 2.1 |  | 7,885 |  |  | 70.14 |  |  | 2.1
| 91,067 |  |  | $ | 44.12 |  |  |  |  | 91,067 |  |  | $ | 44.12 |  |  |
Schedule of Additional Information Pertaining to Option Activity | Additional information pertaining to stock option activity is as follows (in millions):
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Aggregate intrinsic value of stock options exercised | $ | 0.5 |  |  | $ | 4.6 |  |  | $ | 3.7 |
Cash received from the exercise of stock options | 0.2 |  |  | 2.2 |  |  | 5.6 |
Tax benefit realized on exercise of stock options | 0.1 |  |  | 1.2 |  |  | 1.0 |
Summary of PSU Activity | A summary of the PSU activity is presented below.
| Units |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2021 | 400,218 |  |  | $ | 48.30 |
Granted | 50,620 |  |  | 164.43 |
Vested | (120,871) |  |  | 40.79 |
Performance change | (7,715) |  |  | 40.79 |
Forfeited | (3,267) |  |  | 54.54 |
Nonvested at December 31, 2022 | 318,985 |  |  | $ | 69.68 |
Summary of RSU Activity | A summary of the RSU activity is presented below.
| Units |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2021 | 353,910 |  |  | $ | 54.22 |
Granted | 79,122 |  |  | 155.68 |
Vested | (175,654) |  |  | 49.03 |
Forfeited | (9,779) |  |  | 87.25 |
Nonvested at December 31, 2022 | 247,599 |  |  | $ | 89.18 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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