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STOCK-BASED COMPENSATION - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($) plan installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of active stock-based compensation plans | plan |  | 1 |  |
Shares available for grant (in shares) | shares | 15,200,000 | 15,200,000 |  |
Unrecognized compensation cost, net of estimated forfeitures | $ 77,200,000 | $ 77,200,000 |  |
Weighted average period over which cost is expected to be recognized (in years) |  | 2 years 2 months 12 days |  |
Tax benefit recognized related to stock-based compensation |  | $ 24,300,000 | $ 28,800,000 | $ 49,500,000
Intrinsic value of stock options exercised |  | $ 120,900,000 | $ 107,500,000 | $ 151,200,000
Stock options granted in period (shares) | shares | 0 | 0 | 0 | 0
Incremental compensation cost from modification recognized in year of modification |  | $ 21,100,000 | $ 29,000,000.0 | $ 56,900,000
Incremental compensation cost from modification recognized in future period |  | 900,000 |  |
Accelerated cost |  |  |  | 3,900,000
Cash received from stock option exercises |  | 0 | 573,000 | 4,693,000
Cash remitted in stock issuance assuming conversion |  | $ (2,914,000) | $ (12,768,000) | (25,184,000)
Assumed withholding rate (as a percent) |  | 50.00% |  |
Stock options outstanding (shares) | shares | 10,689,000 | 10,689,000 | 23,984,000 |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Stated term (in years) |  | 10 years |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 4 years |  |
Tax benefit realized from stock option exercises |  | $ 11,400,000 | $ 27,900,000 | $ 40,200,000
Stock Appreciation Rights (SARs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Accelerated cost | $ 6,800,000 |  |  |
Stock issued assuming conversion (shares) | shares |  | 3,400,000 |  |
Cash remitted in stock issuance assuming conversion |  | $ 45,200,000 |  |
RSUs & Subsidiary Denominated Equity Instruments |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Stock issued assuming conversion (shares) | shares |  | 6,000,000.0 |  |
Cash remitted in stock issuance assuming conversion |  | $ 76,800,000 |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of installments | installment |  | 2 |  |
Vesting rate (as a percent) |  | 50.00% |  |
Accelerated cost | $ 7,300,000 |  |  |
Weighted average grant date fair value (USD per share) | $ / shares |  | $ 7.37 | $ 13.16 | $ 18.08
Equity units granted (shares) | shares |  | 6,962,000 |  |
Fair value of RSU's that vested during the period |  | $ 23,400,000 | $ 16,100,000 | $ 19,500,000
Vested (shares) | shares |  | 2,128,000 |  |
Subsidiary Denominated Equity Instruments |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 4 years |  |
MSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 2 years |  |
Number of installments | installment |  | 5 |  |
Weighted average grant date fair value (USD per share) | $ / shares |  | $ 0 | $ 3.67 |
Equity units granted (shares) | shares |  | 0 |  | 0
Fair value of RSU's that vested during the period |  | $ 5,200,000 | $ 3,200,000 |
Vested (shares) | shares |  | 738,000 |  |
PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted average grant date fair value (USD per share) | $ / shares |  | $ 6.92 | $ 15.93 |
Equity units granted (shares) | shares |  | 1,844,000 |  |
Vested (shares) | shares |  | 0 | 0 | 0
Minimum | RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 3 years |  |
Minimum | PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 2 years |  |
Maximum | RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 4 years |  |
Maximum | PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (in years) |  | 5 years |  |

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