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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
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) 421,890,790 420,288,886
Common stock, shares outstanding (in shares) 248,996,189 283,650,039
Treasury stock, shares (in shares) 172,894,601 136,638,847