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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 9.0 $ 9.6
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50.0 50.0
Preferred stock, shares outstanding (in shares) 0.0 0.0
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 1,050.0 1,050.0
Common stock, shares issued (in shares) 640.1 636.4
Common stock, shares outstanding (in shares) 623.1 624.3
Treasury stock (in shares) 17.0 12.1