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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation | The following table presents share-based compensation expense:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2021 |  | 2022 |  | 2021 |  | 2022
Share-based compensation | $ | 13.6 |  |  | $ | 15.1 |  |  | $ | 23.3 |  |  | $ | 29.8 |
Tax benefit | 2.2 |  |  | 1.9 |  |  | 4.4 |  |  | 3.7 |
Schedule of Company Restricted Stock Units Transactions | The following table summarizes transactions in the Company’s restricted stock units:
| Restricted Stock Units |  | Weighted Average Grant Date Value
Unvested units—December 31, 2021 | 1.1 |  |  | $ | 95.03 |
Units granted | 0.4 |  |  | 129.46 |
Units vested | (0.3) |  |  | 108.92 |
Units forfeited | (0.0 | ) |  | 97.98 |
Performance condition changes | 0.0 |  |  | 139.30 |
Unvested units—June 30, 2022 | 1.2 |  |  | 102.99 |
Schedule of Company Stock Option Transactions | The following table summarizes transactions in the Company’s stock options:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years)
Unexercised options outstanding—December 31, 2021 | 3.2 |  |  | $ | 77.39 |  |  |
Options granted | 0.0 |  |  | 129.17 |  |  |
Options exercised | (0.0 | ) |  | 90.73 |  |  |
Options forfeited | (0.0 | ) |  | 197.79 |  |  |
Performance condition changes | 0.0 |  |  | 139.31 |  |  |
Unexercised options outstanding—June 30, 2022 | 3.2 |  |  | 77.78 |  |  | 4.2
Exercisable at June 30, 2022 | 0.1 |  |  | 137.54 |  |  | 1.5
Schedule of Fair Value of Options Granted and Assumptions | The weighted average grant date assumptions used to estimate the fair value of stock options granted were as follows:
|  | For the Six Months Ended June 30,
|  | 2021 |  | 2022
Dividend yield |  | 0.0 | % |  | 0.0 | %
Expected volatility |  | 37.3 | % |  | 36.8 | %
Risk-free interest rate |  | 1.0 | % |  | 1.7 | %
Expected life of options (in years) |  | 5.7 |  | 5.7
Forfeiture rate |  | — | % |  | — | %

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- Definition Tabular disclosure of the changes in outstanding nonvested 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)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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