Commitments and Contingencies (Details) - Schedule for aggregate minimum future contractual commitments (USD $) In Millions, unless otherwise specified	May 31, 2013
Schedule for aggregate minimum future contractual commitments [Abstract]
2014	$ 10.7
2014	58.8
2015	3.2
2015	59.6
2016	1.6
2016	47.6
2017	0.7
2017	48.4
2018	0.9
2018	49.1
Thereafter	100.7
Total commitments	17.1
Total commitments	$ 364.2