Stock-Based Compensation (Schedule of Other Stock-Based Awards Activity) (Details) shares in Thousands	12 Months Ended
Dec. 31, 2020 $ / shares shares
Time-Vested Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares
Nonvested at January 1, 2019 \| shares	156
Granted \| shares	123
Vested \| shares	(83)
Forfeited \| shares	(14)
Nonvested at December 31, 2019 \| shares	182
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Nonvested at January 1, 2019, Weighted-Average Grant-Date Fair Value \| $ / shares	$ 123.15
Granted, Weighted-Average Grant-Date Fair Value \| $ / shares	134.31
Vested, Weighted-Average Grant-Date Fair Value \| $ / shares	122.07
Forfeited, Weighted-Average Grant-Date Fair Value \| $ / shares	122.14
Nonvested at December 31, 2019, Weighted-Average Grant-Date Fair Value \| $ / shares	$ 130.91
Performance-based restricted share units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares
Nonvested at January 1, 2019 \| shares	1,584
Granted \| shares	623
Vested \| shares	(370)
Forfeited \| shares	(300)
Nonvested at December 31, 2019 \| shares	1,537
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Nonvested at January 1, 2019, Weighted-Average Grant-Date Fair Value \| $ / shares	$ 118.71
Granted, Weighted-Average Grant-Date Fair Value \| $ / shares	134.81
Vested, Weighted-Average Grant-Date Fair Value \| $ / shares	124.41
Forfeited, Weighted-Average Grant-Date Fair Value \| $ / shares	128.52
Nonvested at December 31, 2019, Weighted-Average Grant-Date Fair Value \| $ / shares	$ 122.56

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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

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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

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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