Stock-based Compensation Plans (Summary of Stock Option Plan Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares
Outstanding, beginning of period, Shares	1,230,211	1,282,278	1,121,559
Granted, Shares	140,339	178,040	242,598
Exercised, Shares	(279,499)	(225,338)	(54,721)
Forfeited or cancelled, Shares	(10,199)	(4,769)	(27,158)
Outstanding, end of period, Shares	1,080,852	1,230,211	1,282,278
Exercisable, end of period, Shares	755,953	845,429	852,804
Weighted Average Exercise Price
Outstanding, beginning of period, Weighted Average Exercise Price	$ 99.14	$ 93.64	$ 87.88
Granted, Weighted Average Exercise Price	139.51	115.35	118.34
Exercised, Weighted Average Exercise Price	87.95	80.24	75.86
Forfeited or cancelled, Weighted Average Exercise Price	121.39	118.01	112.18
Outstanding, end of period, Weighted Average Exercise Price	107.07	99.14	93.64
Exercisable, end of period, Weighted Average Exercise Price	$ 98.82	$ 91.10	$ 82.76

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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