Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 10, 2016
Statement of Financial Position [Abstract]
Accounts receivable allowance	$ 37.0	$ 39.4	$ 42.6
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	320,000,000	320,000,000	320,000,000
Common stock, shares issued (including shares in treasury)	105,956,497	105,647,040	105,599,231
Treasury shares	10,347,476	8,522,425	6,441,591