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Stock Based Compensation Plans | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Stock Based Compensation Plans | 6. Stock Based Compensation Plans The following table provides a summary of option activity:
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  | Average |  |  |  |
|  |  |  | Weighted |  |  | Remaining |  |  |  |
|  |  |  | Average |  |  | Contractual |  |  | Aggregate |
|  |  |  | Exercise |  |  | Term |  |  | Intrinsic |
| Options |  |  | Price |  |  | (in Years) |  |  | Value |
Outstanding at December 31, 2021 |  | 11.3 |  |  | $ | 58.83 |  |  |  |  |  |  |
Granted |  | 1.5 |  |  |  | 85.21 |  |  |  |  |  |  |
Exercised |  | (0.6 | ) |  |  | 40.81 |  |  |  |  |  |  |
Cancelled |  | (0.3 | ) |  |  | 78.76 |  |  |  |  |  |  |
Outstanding at September 30, 2022 |  | 11.9 |  |  | $ | 62.53 |  |  |  | 5.9 |  |  | $ | 159.0 |
Exercisable at September 30, 2022 |  | 7.3 |  |  | $ | 50.77 |  |  |  | 4.2 |  |  | $ | 159.0 |
The following table provides information regarding the intrinsic value of stock options exercised and stock compensation expense related to stock option awards:
| Three Months Ended |  |  | Nine Months Ended |
| September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |
| 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Intrinsic Value of Stock Options Exercised | $ | 3.3 |  |  | $ | 12.0 |  |  | $ | 29.6 |  |  | $ | 30.8 |
Stock Compensation Expense Related to Stock Option Awards | $ | 4.1 |  |  | $ | 3.4 |  |  | $ | 21.6 |  |  | $ | 19.9 |
Issued Stock Options |  | 0.0 |  |  |  | 0.0 |  |  |  | 1.5 |  |  |  | 1.5 |
Weighted Average Fair Value of Stock Options issued (per share) | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 21.48 |  |  | $ | 17.33 |
Fair Value of Stock Options Issued | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 32.7 |  |  | $ | 26.1 |
The following table provides a summary of the assumptions used in the valuation of issued stock options:
| Three Months Ended |  | Nine Months Ended |
| September 30, |  | September 30, |  | September 30, |  |  | September 30, |
| 2022 |  | 2021 |  | 2022 |  |  | 2021 |
Risk-free interest rate | - |  | - |  |  | 2.9 | % |  |  | 1.3 | %
Expected life in years | - |  | - |  |  | 7.1 |  |  |  | 7.2 |
Expected volatility | - |  | - |  |  | 21.7 | % |  |  | 20.7 | %
Dividend yield | - |  | - |  |  | 1.2 | % |  |  | 1.2 | %

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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