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Financial Instruments Contractual Maturities of Types of Securities (Details)
$ in Millions
Oct. 31, 2016
USD ($)
Cost  
Due within 1 year $ 490.2
Due in 1 year through 5 years 448.3
Due in 5 years through 10 years 8.5
Total 947.0
Fair Value  
Due within 1 year 491.6
Due in 1 year through 5 years 449.1
Due in 5 years through 10 years 8.5
Total $ 949.2