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Stock Based Compensation Plans and Other Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Option Activity | Stock option transactions for the year ended December 31, 2021 were as follows:
|  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  | Weighted |  |  | Average |  |  |  |  |
|  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
| Options |  |  | Price |  |  | Term |  |  | Value |
Outstanding as of December 31, 2020 |  | 12.7 |  |  | $ | 50.72 |  |  |  |  |  |  |  |  |
Granted |  | 1.5 |  |  |  | 84.71 |  |  |  |  |  |  |  |  |
Exercised |  | (2.8 | ) |  |  | 35.48 |  |  |  |  |  |  |  |  |
Cancelled |  | (0.1 | ) |  |  | 75.48 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2021 |  | 11.3 |  |  | $ | 58.83 |  |  |  | 6.1 |  |  | $ | 493.3 |
Exercisable as of December 31, 2021 |  | 6.7 |  |  | $ | 44.80 |  |  |  | 4.3 |  |  | $ | 380.5 |
Summary of Information Relating to Options Outstanding and Exercisable | The following table summarizes information relating to options outstanding and exercisable as of December 31, 2021:
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  | Outstanding |  |  | Average |  |  | Average |  |  | Exercisable |  |  | Average |
Range of |  | as of |  |  | Remaining |  |  | Exercise |  |  | as of |  |  | Exercise |
Exercise Prices |  | 12/31/2021 |  |  | Contractual Life |  |  | Price |  |  | 12/31/2021 |  |  | Price |
$20.01 - $30.00 |  |  | 0.2 |  |  |  | 0.5 |  |  | $ | 26.98 |  |  |  | 0.2 |  |  | $ | 26.98 |
$30.01 - $40.00 |  |  | 1.3 |  |  |  | 2.2 |  |  | $ | 33.93 |  |  |  | 1.3 |  |  | $ | 33.93 |
$40.01 - $50.00 |  |  | 2.4 |  |  |  | 3.9 |  |  | $ | 44.07 |  |  |  | 2.4 |  |  | $ | 44.07 |
$50.01 - $60.00 |  |  | 2.7 |  |  |  | 6.0 |  |  | $ | 51.98 |  |  |  | 2.7 |  |  | $ | 51.98 |
$60.01 - $70.00 |  |  | 0.1 |  |  |  | 6.9 |  |  | $ | 65.52 |  |  |  | 0.1 |  |  | $ | 65.52 |
$70.01 - $80.00 |  |  | 3.1 |  |  |  | 8.0 |  |  | $ | 75.36 |  |  |  | 0.0 |  |  | $ | - |
$80.01 - $90.00 |  |  | 1.5 |  |  |  | 9.5 |  |  | $ | 84.70 |  |  |  | 0.0 |  |  | $ | - |
|  |  | 11.3 |  |  |  | 6.1 |  |  | $ | 58.83 |  |  |  | 6.7 |  |  | $ | 44.80 |
Information Regarding Intrinsic Value of Stock Options Exercised and Stock Compensation Expense Related to Stock Option Awards | The following table provides information regarding the intrinsic value of stock options exercised and stock compensation expense related to stock option awards:
| 2021 |  |  | 2020 |  |  | 2019 |
Intrinsic Value of Stock Options Exercised | $ | 157.3 |  |  | $ | 159.8 |  |  | $ | 93.1 |
Stock Compensation Expense Related to Stock Option Awards | $ | 23.3 |  |  | $ | 21.1 |  |  | $ | 20.3 |
Issued Stock Options |  | 1.5 |  |  |  | 1.9 |  |  |  | 1.5 |
Weighted Average Fair Value of Stock Options issued (per share) | $ | 17.32 |  |  | $ | 12.85 |  |  | $ | 14.90 |
Fair Value of Stock Options Issued | $ | 26.6 |  |  | $ | 24.5 |  |  | $ | 22.1 |
Assumptions Used in Valuation of Issued Stock Options | The following table provides a summary of the assumptions used in the valuation of issued stock options:
| 2021 |  |  | 2020 |  |  | 2019 |
Risk-free interest rate |  | 1.3 | % |  |  | 0.5 | % |  |  | 2.0 | %
Expected life in years |  | 7.2 |  |  |  | 7.3 |  |  |  | 7.3 |
Expected volatility |  | 20.7 | % |  |  | 19.9 | % |  |  | 17.2 | %
Dividend yield |  | 1.2 | % |  |  | 1.3 | % |  |  | 1.2 | %

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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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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