Auction Rate Securities (Tables)

9 Months Ended

Jul. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Significant Assumptions Used to Determine Fair Value of Auction Rate Securities

The following table presents the significant assumptions used to determine the fair values of our auction rate securities at July 31, 2014 and October 31, 2013:

Assumption	July 31, 2014	October 31, 2013
Discount rates	L + 0.31% – L + 4.41%	L + 0.33% – L + 3.01%
Yields	2.15%, L + 2.00%	2.15%, L + 2.00%
Average expected lives	4 – 10 years	4 – 10 years

L - One Month LIBOR

Changes in Cost Basis and Fair Value of Auction Rate Securities

The following table presents the changes in the cost basis and fair value of our auction rate securities as of October 31, 2013 and July 31, 2014:

(in millions)	Amortized Cost Basis			Fair Value (Level 3)
Balance at November 1, 2012	$	18.0		$	17.8
Unrealized gains included in accumulated other comprehensive loss	—			0.2
Redemption of security by issuer	(5.0		)	(5.0		)
Balance at October 31, 2013	$	13.0		$	13.0
Balance at July 31, 2014	$	13.0		$	13.0