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EARNINGS PER COMMON SHARE - ADDITIONAL INFORMATION (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 28, 2021
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) | 0.9 |  | 3.5 |  |  |  |  |
Earnings per share, potentially dilutive securities excluded from computation of earnings per share (in shares) |  |  |  |  |  |  | 0.9 |
Treasury stock, shares, acquired (in shares) |  |  |  |  |  | 1.5 |  |
Treasury shares purchased |  | $ 90,000,000 |  | $ 0 | $ 140,000,000 | $ 90,000,000 |  |
Treasury stock acquired, average cost per share (in usd per share) |  |  |  |  |  | $ 60,620,000 |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 1,000,000,000
Stock Options And Restricted Stock Units |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) |  |  |  |  |  | 0.9 |  |
Common Stock |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) |  |  |  |  |  |  | 3.2 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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