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Stock-Based Incentive Compensation Plans (Summary of activity for restricted stock units) (Details) - Restricted Stock Units [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Shares:
Outstanding as of beginning of year (in shares) | shares	1,551,129
Granted (in shares) | shares	623,599
Vested (in shares) | shares	(413,309)
Forfeited (in shares) | shares	(103,517)
Outstanding as of end of year (in shares) | shares	1,657,902
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value, outstanding as of beginning of year (in dollars per share) | $ / shares	$ 70.09
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares	60.83
Weighted-average grant date fair value, vested (in dollars per share) | $ / shares	70.96
Weighted-average grant date fair value, forfeited (in dollars per share) | $ / shares	66.48
Weighted-average grant date fair value, outstanding as of end of year (in dollars per share) | $ / shares	$ 66.62

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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.

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-Section 50
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-Subparagraph (c)(2)(iii)(3)
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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).

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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).

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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.

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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.

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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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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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