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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 423,057,848 421,890,790
Common stock, shares outstanding (in shares) 244,231,933 248,996,189
Treasury stock, shares (in shares) 178,825,915 172,894,601