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v3.21.1

Stock-Based Compensation Plans (Details 2) - $ / shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Weighted average grant date fair value per award |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | (2,126) |
Performance Shares |  |
Performance awards |  |
Equity instruments outstanding at the beginning of the period (in shares) | 241,921 |
Equity instruments granted (in shares) | 137,929 |
Change in awards based on performance (in shares) | (37,469) |
Converted to restricted stock (in shares) | (56,545) |
Forfeited (in shares) | 0 |
Equity instruments outstanding at the end of the period (in shares) | 285,836 |
Weighted average grant date fair value per award |  |
Equity instruments outstanding at the beginning of the period (in dollars per share) | $ 195.13 |
Grant date fair value per share (in dollars per share) | 191.10 |
Change in awards based on performance (in dollars per share) | 156.00 |
Converted to restricted stock (in dollars per share) | 156.00 |
Forfeited (in dollars per share) | 0 |
Equity instruments outstanding at the end of the period (in dollars per share) | $ 206.05 |
Grants in period based on total shareholder metrics | 69,012 |
Grants in period based on financial metrics | 68,917 |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Dividend yield | 3.50% |
Employee and Directors Stock Options |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 2 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 28.64 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 5 years |
Dividend yield | 3.50% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 27.10% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 0.81% |
Employee and Directors Stock Options | Stock Option and Incentive Plan 2009 |  |
Weighted average grant date fair value per award |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 304,495 | 12,506
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 10,380 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | (2,126) |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 180.32 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 294,115 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 178.64 | $ 129.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | 130.90 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ 121.78 |
Performance Options |  |
Weighted average grant date fair value per award |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 4,847 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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