Share-Based Compensation Plans - Stock Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2015 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	1.8
Forfeited or expired (in shares) | shares	(0.2)
Exercised (in shares) | shares	(0.8)
Ending balance (in shares) | shares	0.8
Exercisable (in shares) | shares	0.3
Weighted-Average Exercise Price per Share
Beginning balance (usd per share) | $ / shares	$ 20.2
Forfeited or expired (usd per share) | $ / shares	22.3
Exercised (usd per share) | $ / shares	20.2
Ending balance (usd per share) | $ / shares	19.7
Exercisable (usd per share) | $ / shares	$ 18.5
Weighted-Average Remaining Contractual Term (in years)
Weighted-Average Remaining Contractual Term Outstanding (in years)	3 years 2 months 12 days	[1]
Weighted-Average Remaining Contractual Term Exercisable (in years)	3 years 2 months 12 days	[1]
Aggregate Intrinsic Value
Aggregate Intrinsic Value Outstanding | $	$ 6.7	[2]
Aggregate Intrinsic Value Exercisable | $	$ 3.2	[2]

[1] Excludes contractual terms associated with plans prior to the 2006 Equity Plan due to the uncertainty of expiration.

[2] Amount by which the current market price of our common stock on October 31, 2015 exceeds the exercise price.