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STOCK-BASED COMPENSATION - Stock Options (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021
Options
Outstanding, beginning balance (in shares)	4,379,663
Exercised (in shares)	(1,403,996)
Outstanding, ending balance (in shares)	2,975,667
Exercisable at current period-end (in shares)	2,975,667
Weighted- average exercise price
Weighted-average exercise price of options outstanding, beginning balance (in dollars per share)	$ 71.67
Weighted-average exercise price of options exercised (in dollars per share)	69.20
Weighted-average exercise price of options outstanding, ending balance (in dollars per share)	72.83
Weighted-average exercise price of options exercisable at current period-end (in dollars per share)	$ 72.83

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

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

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

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