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STOCK-BASED COMPENSATION - Plan Information and P&L Impact (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
STOCK-BASED COMPENSATION |  |  |
Number of active plans | plan | 2 |  |
Term of plan | 10 years |  |
Income tax benefit related to non-cash compensation | $ | $ 11.4 | $ 12.2 | $ 11.2
Excess tax benefit | $ | $ 2.5 | $ 17.1 | $ 77.6
Equity Award Plan |  |  |
STOCK-BASED COMPENSATION |  |  |
Number of shares authorized | shares | 6,100,000 |  |
Inducement Plan |  |  |
STOCK-BASED COMPENSATION |  |  |
Number of shares authorized | shares | 500,000 |  |

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