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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred stock, par or stated value per share (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized (in shares) 25,000,000 25,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par or stated value per share (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 264,500,000 264,500,000
Common stock, shares outstanding (in shares) 221,300,000 223,000,000.0
Treasury stock, shares (in shares) 43,200,000 41,500,000