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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
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) 218,100,000 215,200,000
Common stock, shares outstanding (in shares) 209,100,000 207,700,000
Treasury stock, shares (in shares) 9,000,000 7,500,000