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Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014	Aug. 31, 2013
Investments (Details) [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 18.6	$ 19.4	$ 18.6	$ 19.4	$ 18.4
Equity Method Investments	18.6us-gaap_EquityMethodInvestments	19.4us-gaap_EquityMethodInvestments	18.6us-gaap_EquityMethodInvestments	19.4us-gaap_EquityMethodInvestments	18.4us-gaap_EquityMethodInvestments
Gain (Loss) on Investments	0us-gaap_GainLossOnInvestments	4.7us-gaap_GainLossOnInvestments	(0.6)us-gaap_GainLossOnInvestments	4.7us-gaap_GainLossOnInvestments
Income (Loss) from Equity Method Investments			1.8	1.7
UK Equity-method
Investments (Details) [Line Items]
Equity Method Investment, Ownership Percentage	26.20%		26.20%
Software Development Business
Investments (Details) [Line Items]
Equity Method Investment, Ownership Percentage						20.00%
Equity Method Investments						1.0
Equity Method Investment, Other than Temporary Impairment					$ 0