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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation | The following table presents share-based compensation expense:
| For the Three Months Ended March 31,
| 2020 |  | 2021
Share-based compensation | $ | 8.2 |  |  | $ | 9.7 |
Tax benefit | 1.5 |  |  | 2.2 |
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, 2020 | 1.2 |  |  | $ | 99.46 |
Units granted | 0.2 |  |  | 139.08 |
Units vested | (0.2) |  |  | 154.47 |
Units forfeited | (0.1) |  |  | 106.18 |
Performance condition changes | 0.0 |  |  | 110.02 |
Unvested units - March 31, 2021 | 1.1 |  |  | 93.36 |
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, 2020 | 2.9 |  |  | $ | 82.14 |  |  |
Options granted | 0.0 |  |  | 137.55 |  |  |
Options exercised | (0.1) |  |  | 122.40 |  |  |
Options forfeited | (0.0 | ) |  | 91.86 |  |  |
Performance condition changes | — |  |  | — |  |  |
Unexercised options outstanding - March 31, 2021 | 2.8 |  |  | 81.62 |  |  | 4.9
Exercisable at March 31, 2021 | 0.4 |  |  | 127.49 |  |  | 1.4
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 Three Months Ended March 31,
|  | 2020 |  | 2021
Dividend yield |  | 1.7 | % |  | 0.0 | %
Expected volatility |  | 29.4 | % |  | 37.6 | %
Risk-free interest rate |  | 0.9 | % |  | 1.0 | %
Expected life of options (in years) |  | 5.7 |  | 5.7
Forfeiture rate |  | — | % |  | — | %

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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