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Share-Based Compensation Plans - Stock Option Activity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Oct. 31, 2014
Number of Shares  
Outstanding at beginning of period 1.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercised (0.4)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Outstanding at end of period 1.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Vested and exercisable at end of period 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Weighted-Average Exercise Price per Share  
Outstanding at beginning of period $ 21.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercised $ 20.9us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Outstanding at end of period $ 21.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable at end of period $ 20.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 3 years 9 months 20 days
Exercisable at end of period 3 years 8 months 13 days
Aggregate Intrinsic Value  
Outstanding at end of period $ 7.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable at end of period $ 3.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1