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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
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) 423,545,261 423,057,848
Common stock, shares outstanding (in shares) 244,779,313 244,231,933
Treasury stock, shares (in shares) 178,765,948 178,825,915