Financial Instruments Contractual Maturities of Types of Securities (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2012
Cost [Abstract]
Due in 1 year	$ 402.8
Due in 1 year through 5 years	298.7
Due in 5 year through 10 years	0
Due after 10 years	4.2
Total	705.7
Fair Value Disclosures [Abstract]
Due in 1 year	402.8
Due in 1 year through 5 years	298.8
Due in 5 year through 10 years	0
Due after 10 years	4.2
Total	$ 705.8

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