Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
shares in Millions
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 2.5 $ 2.5
Common stock, shares authorized 500.0 500.0
Common stock, shares issued 222.4 222.4
Treasury stock, shares 61.9 56.7
Common stock held by employee benefits trust, shares 0.5 0.5