Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Unrealized (losses) gains on auction rate securities, Pre-tax amounts:
Unrealized gains on auction rate securities	$ 0.5	$ 0	$ 0	$ 0.2
Unrealized gains (losses) on interest rate swaps, Pre-tax amounts:
Unrealized gains (losses) arising during the period, Pre-tax amounts	0.1	0.7	(0.2)	0.2
Reclassification adjustment for loss included in interest expense, Pre-tax amounts	0.1	0.2	0.4	0.3
Net unrealized gains on interest rate swaps, Pre-tax amounts	0.2	0.9	0.2	0.5
Foreign currency translation, Pre-tax amounts	0	(0.2)	0	(0.4)
Defined and postretirement benefit plans adjustments, Pre-tax amounts
Reclassification adjustment for amortization of actuarial losses, Pre-tax amounts	0.1	0.1	0.1	0.1
Reclassification adjustment for settlement losses, Pre-tax amounts	0	0.1	0	0.1
Net defined and postretirement benefit plans adjustments, Pre-tax amounts	0.1	0.2	0.1	0.2
Total other comprehensive income, Pre-tax amounts	0.8	0.9	0.3	0.5
Unrealized (losses) gains on auction rate securities, Tax expense/(benefit):
Unrealized (losses) gains on auction rate securities, Tax expense/(benefit)	0.2	0	0	0.1
Unrealized gains (losses) on interest rate swaps, Tax expense/(benefit):
Unrealized gains (losses) arising during the period, Tax expense/(benefit)	0	0.3	(0.1)	0.1
Reclassification adjustment for loss included in interest expense, Tax expense/(benefit)	0.1	0.1	0.2	0.1
Net unrealized gains on interest rate swaps, Tax expense/(benefit)	0.1	0.4	0.1	0.2
Foreign currency translation, Tax expense/(benefit)	0	0	0	0
Defined and postretirement plans adjustments, Tax expense/(benefit)
Reclassification adjustment for amortization of actuarial losses, Tax expense/(benefit)	0	0	0	0
Reclassification adjustment for settlement losses, Tax expense/(benefit)	0	0	0	0
Net defined and postretirement benefit plans adjustments, Tax expense/(benefit)	0	0	0	0
Total other comprehensive income, Tax expense/(benefit)	0.3	0.4	0.1	0.3
Net income, After-tax amounts	19.4	16.0	47.7	48.7
Unrealized (losses) gains on auction rate securities, After-tax amounts:
Unrealized (losses) gains on auction rate securities, After-tax amounts	0.3	0	0	0.1
Unrealized gains (losses) on interest rate swaps, After-tax amounts:
Unrealized gains (losses) arising during the period, After-tax amounts	0.1	0.4	(0.1)	0.1
Reclassification adjustment for loss included in interest expense, After-tax amounts	0	0.1	0.2	0.2
Net unrealized gains on interest rate swaps, After-tax amounts	0.1	0.5	0.1	0.3
Foreign currency translation, After-tax amounts	0	(0.2)	0	(0.4)
Defined and postretirement benefit plans adjustments, after tax amounts
Reclassification adjustment for amortization of actuarial losses, After-tax amounts	0.1	0.1	0.1	0.1
Reclassification adjustment for amortization of actuarial losses, After-tax amounts	0	0.1	0	0.1
Net defined and postretirement benefit plans adjustments, After-tax amounts	0.1	0.2	0.1	0.2
Total other comprehensive income, After-tax amounts	0.5	0.5	0.2	0.2
Comprehensive income, After-tax amounts	$ 19.9	$ 16.5	$ 47.9	$ 48.9