Taxes (Details) - Schedule of earnings from continuing operations before income taxes (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 53.4	$ 169.7	$ 84.1
Domestic Tax Authority [Member]
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	34.6	145.4	77.0
Foreign Tax Authority [Member]
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 18.8	$ 24.3	$ 7.1