Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Consolidated Balance Sheets [Abstract]
Redeemable common stock par value	$ 0.10	$ 0.10
Redeemable common stock, shares issued	0.4	0.5
Redeemable common stock, shares outstanding	0.4	0.5
Preference stock, par value	$ 1.00	$ 1.00
Preference stock, shares authorized	15.0	15.0
Preference stock, shares issued
Preference stock, shares outstanding
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	150.0	150.0
Common stock, shares issued	58.4	58.1
Common stock, shares outstanding	58.4	58.1