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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Employee Stock Option |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 21.01 |  |  | $ 15.97 | $ 18.27 | $ 11.68
Total intrinsic value of options exercised | $ 7.1 |  |  | $ 15.3 | $ 164.9 | $ 38.2
Cash received from option exercises | $ 5.9 |  |  | $ 12.1 | $ 65.6 | $ 34.8
Stock units expected to vest (in shares) | 28,330 |  |  |  | 28,330 |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 106.2 |  |  |  | $ 106.2 |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 3 years 2 months 12 days |
Restricted Stock Units, and Performance Share Units |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Stock units expected to vest (in shares) | 1,900 |  |  |  | 1,900 |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 39.5 |  |  |  | $ 39.5 |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 1 year 4 months 24 days |
Number of Shares |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  | 2,026 |  | 2,026 |
Granted (in shares) | 2 | 22 | 523 |  |  |
Vested (in shares) |  |  |  |  | (593) |
Forfeited/cancelled (in shares) |  |  |  |  | (12) |
Non-vested at the end of the period (in shares) | 1,968 |  |  |  | 1,968 |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  |  | $ 36.27 |  | $ 36.27 |
Granted (in dollars per share) | $ 56.38 | $ 59.70 | $ 48.49 |  |  |
Vested (in dollars per share) |  |  |  |  | 32.82 |
Forfeited/cancelled (in dollars per share) |  |  |  |  | 32.71 |
Non-vested at the end of the period (in dollars per share) | 40.86 |  |  |  | 40.86 |
Restricted Stock Units, and/or Performance Share Units |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 56.38 |  |  | $ 47.59 | $ 51.22 | $ 37.12
Performance Share Units |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 100.00% |
Performance Share Units | Maximum |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 200.00% |
Performance Share Units | Minimum |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 0.00% |
Other Share-Based Awards |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 1.2 |  |  |  | $ 1.2 |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 1 year 7 months 6 days |

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