CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 1.2	$ 1.0
Preferred Stock, par value	$ 1.00	$ 1.00
Preferred Stock, Authorized	2,500,000	2,500,000
Preferred Stock, issued	0	0
Common Stock, par value	$ 1.00	$ 1.00
Common Stock, Authorized	300,000,000	300,000,000
Common Stock, shares issued	146,427,550	146,427,550
Common stock in treasury, shares	18,258,130	16,473,506