Share-Based Compensation Plans - Prior Plan 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	1.6
Exercised	(0.4)
Outstanding at end of period	1.2
Exercisable at end of period	0.5
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	$ 21.6
Exercised	$ 20.9
Outstanding at end of period	$ 21.8
Exercisable at end of period	$ 20.2
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	$ 7.2
Prior Plans [Member]
Number of Shares
Outstanding at beginning of period	0.8
Exercised	(0.2)
Outstanding at end of period	0.6
Exercisable at end of period	0.4
Weighted-Average Exercise Price per Share
Outstanding at beginning of period	$ 17.3
Exercised	$ 18.9
Outstanding at end of period	$ 16.8
Exercisable at end of period	$ 18.2
Weighted-Average Remaining Contractual Term (in years)
Outstanding at end of period	17 years 9 months 19 days
Exercisable at end of period	9 years 2 months 13 days
Aggregate Intrinsic Value
Outstanding at end of period	6.2
Exercisable at end of period	$ 3.6