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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Common stock, par or 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) 423,041,349 421,890,790
Common stock, shares outstanding (in shares) 244,147,420 248,996,189
Treasury stock, shares (in shares) 178,893,929 172,894,601