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Earnings Per Share - Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based compensation awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 828,835 2,172,157 1,138,251