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Fair Value of Financial Instruments - Schedule of Debt Securities Maturities (Details) (USD $) In Millions, unless otherwise specified	May 31, 2014
Fair Value Disclosures [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 2.9
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2.9
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	8.1
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	8.1
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	0.1
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	0.1
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	11.1
Available-for-sale Securities, Debt Securities	$ 11.1

X

- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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