Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowance for doubtful accounts $ 9.5 $ 7.8
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, Authorized shares (in shares) 10,000,000.0 10,000,000.0
Preferred stock, Issued shares (in shares) 0 0
Common stock, par value (in dollars per share) $ 1.25 $ 1.25
Common stock, Authorized shares (in shares) 300,000,000.0 300,000,000.0
Common stock, Issued shares (in shares) 189,300,000 189,300,000
Common stock, Outstanding shares (in shares) 120,400,000 119,900,000
Treasury stock, shares (in shares) 68,300,000 68,800,000
Stock held by employee benefits trusts, shares (in shares) 600,000 600,000