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Net Earnings per Share - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jan. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of shares authorized to be repurchased (in shares)         100,000,000
Remaining number of shares authorized to be repurchased (in shares) 85,000,000   85,000,000    
Share-based Payment Arrangement, Option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (less than for the 3 months 2020) (in shares) 1,000,000 1,000,000 1,000,000 2,000,000