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STOCK PLANS - Schedule of Stock Based Compensation Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Options
Outstanding beginning of period (in shares) | shares	6,235,118
Granted (in shares) | shares	769,352
Exercised (in shares) | shares	(553,023)
Forfeited (in shares) | shares	(238,865)
Expired (in shares) | shares	(42,416)
Outstanding end of period (in shares) | shares	6,170,166
Weighted Average Exercise Price
Outstanding beginning of period (in dollars per share) | $ / shares	$ 45.98
Granted (in dollars per share) | $ / shares	61.33
Exercised (in dollars per share) | $ / shares	34.43
Forfeited (in dollars per share) | $ / shares	46.19
Expired (in dollars per share) | $ / shares	76.62
Outstanding at end of period (in dollars per share) | $ / shares	$ 48.71
Restricted Stock Units (RSUs)
Number of Units
Unvested at beginning of period (shares) | shares	957,453
Granted (shares) | shares	401,845
Vested (shares) | shares	(302,228)
Forfeited (shares) | shares	(114,562)
Unvested at end of period (shares) | shares	942,508
Weighted Average Grant Date Fair Value
Unvested at beginning of period (usd per share) | $ / shares	$ 46.34
Granted (usd per share) | $ / shares	61.53
Vested (usd per share) | $ / shares	44.87
Forfeited (usd per share) | $ / shares	49.95
Unvested at end of period (usd per share) | $ / shares	$ 52.85

X

- Definition

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

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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.

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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 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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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