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STOCK-BASED COMPENSATION - Narrative - Stock Options (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
STOCK-BASED COMPENSATION |  |  |  |
Proceeds from stock options exercised |  | $ 7,700,000 |  |
Exercise of option, tax benefit |  | $ 700,000 |  |
Weighted average fair value (in dollars per share) |  | $ 116.08 | $ 167.10 | $ 150.55
Fair value of options vested |  | $ 5,800,000 | $ 6,900,000 | $ 11,400,000
Performance measurement period two | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Return performance, percent of target stock price |  |  |  | 41.00%
Stock Options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Unrecognized compensation cost | $ 25,500,000 | $ 25,500,000 |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 4 years |  |
Intrinsic value of stock options exercised |  | $ 6,800,000 | $ 50,200,000 | $ 268,300,000
Granted (in dollars per share) |  | $ 290.27 |  |
Dividend yield |  | 0.00% | 0.00% | 0.00%
Stock Options | Chairman and Chief Executive Officer |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Granted (in dollars per share) | $ 300 |  |  |
Exercise price premium | 25.00% |  |  |
Post-exercise holding requirement period | 2 years |  |  |
Expected term | 6 years 10 months 24 days |  |  |
Dividend yield | 0.00% |  |  |
Expected volatility rate | 52.00% |  |  |
Risk free rate | 0.92% |  |  |
Discount rate | 8.80% |  |  |
Stock Options | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expected term |  | 5 years | 5 years | 5 years
Stock Options | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expected term |  | 6 years 3 months | 6 years 3 months | 6 years 8 months 15 days
Stock Options | One year from the grant date |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 1 year |  |
Stock Options | Two years from the grant date |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 2 years |  |
Vesting percentage |  | 50.00% |  |
Stock Options | Three years from the grant date |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 3 years |  |
Vesting percentage |  | 33.00% |  |
Stock Options | Four years from the grant date |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 4 years |  |
Vesting percentage |  | 25.00% |  |
Stock Options | Six years from the grant date |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period |  | 6 years |  |
Performance Options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Unrecognized compensation cost | $ 58,200,000 | $ 58,200,000 |  |
Weighted-average period for recognition of unrecognized compensation cost |  | 2 years 9 months 18 days |  |
Weighted average fair value (in dollars per share) |  | $ 142.54 | $ 230.81 | $ 296.80
Granted (in dollars per share) |  | $ 298.05 |  |
Expected term |  | 7 years | 7 years |
Dividend yield |  | 0.00% | 0.00% | 0.00%
Dividends |  | $ 0 | $ 0 | $ 0
Return performance, percent of target stock price |  |  | 81.00% |
Maximum number of shares for earned (in shares) |  |  | 27,132 |
Performance awards earned (in shares) | 481,669 | 481,669 |  |
Performance Options | Chairman and Chief Executive Officer |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Granted (in dollars per share) | $ 300 |  |  |
Exercise price premium | 25.00% |  |  |
Post-exercise holding requirement period | 2 years |  |  |
Expected term | 7 years 6 months 14 days |  |  |
Dividend yield | 0.00% |  |  |
Expected volatility rate | 52.00% |  |  |
Risk free rate | 0.92% |  |  |
Discount rate | 8.80% |  |  |
Performance Options | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expected term |  |  |  | 7 years
Return performance, percent of target stock price |  |  | 41.00% |
Performance Options | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expected term |  |  |  | 7 years 1 month 24 days
Performance Options | Performance measurement period one |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Return performance, percent of target stock price | 81.00% | 81.00% |  | 110.00%
Maximum number of shares for earned (in shares) | 31,940 | 31,940 |  | 52,332
Performance Options | Performance measurement period one | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Return performance, percent of target stock price | 41.00% | 41.00% |  | 70.00%
Performance Options | Performance measurement period two |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Return performance, percent of target stock price | 135.00% | 135.00% |  | 81.00%
Maximum number of shares for earned (in shares) | 363,464 | 363,464 |  | 21,982
Performance Options | Performance measurement period two | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Return performance, percent of target stock price | 81.00% | 81.00% |  |

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