Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (9.5)	$ 197.4	$ (61.8)	$ 171.6
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	7.5	23.0	22.7	68.8
Comprehensive (loss) income	$ (2.0)	$ 220.4	$ (39.1)	$ 240.4