SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Options
Forfeited (in shares)	(1)
Exercised (in shares)	(169)
Weighted-Average Exercise Price
Forfeited (in USD per share)	$ 76.91
Exercised (in USD per share)	$ 51.89
Employee stock option
Options
Outstanding at beginning of period (in shares)	921
Granted (in shares)	154
Outstanding at end of period (in shares)	905	921
Options vested and exercisable (in shares)	616
Weighted-Average Exercise Price
Outstanding at beginning of period (in USD per share)	$ 99.54
Granted (in USD per share)	130.09
Outstanding at end of period (in USD per share)	113.67	$ 99.54
Options vested and exercisable (in USD per share)	$ 111.85
Weighted-Average Remaining Contractual Term
Outstanding	5 years 8 months 12 days	5 years
Options vested and exercisable	4 years
Aggregate Intrinsic Value
Outstanding	$ 23.8	$ 32.1
Options vested and exercisable	$ 19.1

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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