Accrued Severance (Details) - Schedule of accrued severance cost associated with cost reduction measures (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	May 31, 2013
Schedule of accrued severance cost associated with cost reduction measures [Abstract]
Beginning balance	$ 3.3	$ 2.7	$ 2.7
Accruals	7.8	2.1	13.4
Payments	(6.1)	(2.9)	(12.8)
Ending balance	$ 5.0	$ 1.9	$ 3.3