Employee Benefit Plans - Components of Net Periodic Benefit Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	$ 0.4	$ 0.3
Interest costs	3.1	2.5
Expected return on plan assets	(3.7)	(2.5)
Amortization of net actuarial loss (gain)	1.3	0.6
Amortization of prior service costs	0	0
Net periodic cost (benefit)	1.1	0.9
Health Care Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	0	0
Interest costs	0.1	0.1
Expected return on plan assets	0	0
Amortization of net actuarial loss (gain)	(0.3)	(0.4)
Amortization of prior service costs	(0.1)	(0.1)
Net periodic cost (benefit)	$ (0.3)	$ (0.4)