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Share-Based Compensation - Summary of Restricted Stock and Performance Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted Stock Units
Shares
Balance at beginning of period (in shares) | shares	6,869
Granted (in shares) | shares	1,671
Forfeited (in shares) | shares	(293)
Vested (in shares) | shares	(3,450)
Balance at end of period (in shares) | shares	4,797
Weighted- Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 93.80
Granted (in dollars per share) | $ / shares	111.27
Forfeited (in dollars per share) | $ / shares	94.33
Vested (in dollars per share) | $ / shares	95.86
Balance at end of period (in dollars per share) | $ / shares	$ 98.29
Restricted Stock Awards
Shares
Balance at beginning of period (in shares) | shares	48
Granted (in shares) | shares	0
Forfeited (in shares) | shares	0
Vested (in shares) | shares	(48)
Balance at end of period (in shares) | shares	0
Weighted- Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 102.30
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	102.30
Balance at end of period (in dollars per share) | $ / shares	$ 0
Performance Share Units
Shares
Balance at beginning of period (in shares) | shares	2,328
Granted (in shares) | shares	0
Forfeited (in shares) | shares	(28)
Vested (in shares) | shares	(479)
Balance at end of period (in shares) | shares	1,821
Weighted- Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 94.61
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	90.41
Vested (in dollars per share) | $ / shares	92.62
Balance at end of period (in dollars per share) | $ / shares	$ 95.20

X

- Definition

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

+ References

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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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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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- 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).

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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 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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