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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 8.8 $ 8.9
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
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) 350,000,000 350,000,000
Common stock, shares issued (in shares) 216,900,000 215,200,000
Common stock, shares outstanding (in shares) 207,900,000 207,700,000
Treasury stock (in shares) 9,000,000 7,500,000