Commitments and Contingencies (Details) - Schedule for minimum future annual rental commitments (USD $) In Millions, unless otherwise specified	May 31, 2013	May 31, 2012
Schedule for minimum future annual rental commitments [Abstract]
2014	$ 34.6
2014	5.4
2015	30.2
2015	5.2
2016	24.6
2016	5.1
2017	18.8
2017	5.9
2018	14.5
2018	6.1
Thereafter	41.8
Thereafter	179.1
Total minimum lease payments	164.5
Total minimum lease payments	206.8
Less minimum sublease income to be received	13.9
Less minimum sublease income to be received	65.0
Minimum lease payments, net of sublease income	150.6
Minimum lease payments, net of sublease income	141.8
Less amount representing interest	149.1
Present value of net minimum capital lease payments	57.7
Less current maturities of capital lease obligations	0.2	1.0
Long-term capital lease obligations	$ 57.5	$ 56.4