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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized shares (in shares) 50,000,000.0 50,000,000.0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 350,000,000.0 350,000,000.0
Common stock, shares issued (in shares) 215,200,000 212,000,000
Common stock, shares outstanding (in shares) 207,700,000 209,700,000
Treasury stock, shares (in shares) 7,500,000 2,300,000