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EARNINGS PER SHARE - Narrative (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Stock Option    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares not included in computation of diluted earnings per share (in shares) 0.1 0.1