Balance Sheet Accounts - Schedule of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	May 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (222.4)
Amounts reclassified from accumulated other comprehensive loss	15.2
Ending balance	(207.2)
Actuarial Losses, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(226.2)
Amounts reclassified from accumulated other comprehensive loss	15.4
Ending balance	(210.8)
Prior Service Credits, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3.8
Amounts reclassified from accumulated other comprehensive loss	(0.2)
Ending balance	$ 3.6