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COMMON STOCK REPURCHASE PROGRAM (Details) - $ / shares | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Feb. 12, 2020
COMMON STOCK REPURCHASE PROGRAM |  |  |
Shares authorized for repurchase under share repurchase program (in shares) | 55,000,000 | 55,000,000 | 10,000,000
Shares purchased in the open market under share repurchase program (in shares) | 200,000 | 400,000 |
Average cost per share of shares purchased in the open market under share repurchase program (in dollars per share) | $ 127.73 | $ 124.04 |
Remaining shares available for repurchase under the stock repurchase program (in shares) | 11,000,000.0 | 11,000,000.0 |

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