Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	May 31, 2014	Nov. 30, 2013
Statement Of Financial Position [Abstract]
Redeemable common stock, par value	$ 0.10	$ 0.10
Redeemable common stock, shares issued	0.1	0.1
Redeemable common stock, shares outstanding	0.1	0.1
Preference stock, par value	$ 1.00	$ 1.00
Preference stock, shares authorized	15.0	15.0
Preference stock, shares issued	0	0
Preference stock, shares outstanding	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	150.0	150.0
Common stock, shares issued	56.8	59.9
Common stock, shares outstanding	56.8	59.9
Treasury stock, shares	3.5	0