Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (50.2)	$ (11.8)	$ (52.3)	$ (25.8)
Other comprehensive income:
Amortization of actuarial losses, net of income taxes	7.7	22.9	15.2	45.8
Comprehensive (loss) income	$ (42.5)	$ 11.1	$ (37.1)	$ 20.0