Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Nov. 30, 2015	Nov. 30, 2014
Trade accounts receivable, allowances	$ 8.0	$ 4.0
Common Stock [Member]
Common stock, par value (usd per share)
Common stock, shares authorized	320.0	320.0
Common stock, shares issued	11.7	12.0
Common stock, shares outstanding	11.7	12.0
Common Stock Non-Voting [Member]
Common stock, par value (usd per share)
Common stock, shares authorized	320.0	320.0
Common stock, shares issued	115.6	116.4
Common stock, shares outstanding	115.6	116.4