Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Nov. 30, 2016	Nov. 30, 2015
Trade accounts receivable, allowances	$ 4.2	$ 8.0
Common Stock [Member]
Common stock, par value (usd per share)
Common stock, shares authorized	320.0	320.0
Common stock, shares issued	11.4	11.7
Common stock, shares outstanding	11.4	11.7
Common Stock Non-Voting [Member]
Common stock, par value (usd per share)
Common stock, shares authorized	320.0	320.0
Common stock, shares issued	113.9	115.6
Common stock, shares outstanding	113.9	115.6