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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Stock Option |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  |  |  | $ 18.28 | $ 11.74 | $ 12.90
Total intrinsic value of options exercised |  |  |  |  | $ 333.5 | $ 68.2 | $ 51.2
Cash received from option exercises |  |  |  |  | $ 130.3 | $ 64.0 | $ 45.7
Stock units expected to vest (in shares) | 24,215 |  |  |  | 24,215 |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 96.3 |  |  |  | $ 96.3 |  |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 3 years |  |
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 | $ 32.0 |  |  |  | $ 32.0 |  |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 1 year 2 months 12 days |  |
Number of Shares |  |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  |  | 2,026 | 2,026 |  |
Granted (in shares) | 8 | 2 | 22 | 523 |  |  |
Vested (in shares) |  |  |  |  | (595) |  |
Forfeited/cancelled (in shares) |  |  |  |  | (22) |  |
Non-vested at the end of the period (in shares) | 1,964 |  |  |  | 1,964 | 2,026 |
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) | $ 51.99 | $ 56.38 | $ 59.70 | $ 48.49 |  |  |
Vested (in dollars per share) |  |  |  |  | 32.84 |  |
Forfeited/cancelled (in dollars per share) |  |  |  |  | 32.49 |  |
Non-vested at the end of the period (in dollars per share) | $ 40.95 |  |  |  | 40.95 | $ 36.27 |
Restricted Stock Units, and/or Performance Share Units |  |  |  |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 51.24 | $ 37.13 | $ 44.56
Performance Share Units |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 100.00% |  |
Performance Share Units | Minimum |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 0.00% |  |
Performance Share Units | Maximum |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Percentage of target performance |  |  |  |  | 200.00% |  |
Other Share-Based Awards |  |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |  |
Total unrecognized compensation expense related to non-vested shares granted to employees | $ 0.3 |  |  |  | $ 0.3 |  |
Cost expected to be recognized over a weighted-average period |  |  |  |  | 1 year |  |

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