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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 900,000,000 900,000,000
Common stock, shares issued (in shares) 324,680,450 320,469,049
Common stock, shares outstanding (in shares) 321,894,286 318,377,161
Treasury stock, shares (in shares) 2,786,164 2,091,888