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Share-Based Compensation Plans (Share Options Outstanding And Exercisable) (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding | shares	116,871
Options Outstanding, Weighted Average-Remaining Contractual Life	8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 87.87
Options Exercisable, Number Exercisable | shares	116,871
Options Exercisable, Weighted-Average Exercise Price	$ 87.87
Exercise Prices Range 1 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	86.62
Ranges of Exercise Prices, Upper range limit	$ 88.31
Options Outstanding, Number Outstanding | shares	44,000
Options Outstanding, Weighted Average-Remaining Contractual Life	2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 86.62
Options Exercisable, Number Exercisable | shares	44,000
Options Exercisable, Weighted-Average Exercise Price	$ 86.62
Exercise Prices Range 2 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	88.32
Ranges of Exercise Prices, Upper range limit	$ 90.48
Options Outstanding, Number Outstanding | shares	66,917
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 88.32
Options Exercisable, Number Exercisable | shares	66,917
Options Exercisable, Weighted-Average Exercise Price	$ 88.32
Exercise Prices Range 3 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	90.49
Ranges of Exercise Prices, Upper range limit	$ 110.13
Options Outstanding, Number Outstanding | shares	5,954
Options Outstanding, Weighted Average-Remaining Contractual Life	6 months
Options Outstanding, Weighted Average Exercise Price	$ 91.99
Options Exercisable, Number Exercisable | shares	5,954
Options Exercisable, Weighted-Average Exercise Price	$ 91.99

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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