Fair Value Measures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010 years	Oct. 31, 2009
Fair Value Measures [Abstract]
Contingent consideration	$ 4.3
Contingent consideration payable period (years)		3
Reduction in contingent consideration charged to research and development expenses	3.8
Other-than-temporary impairment	1.0	0.5	7.2
Business acquisition, contingent consideration, at fair value on acquisition date		7.8
Cost of equity investments sold	2.4
Sale of equity investments	3.2
Gain on sale of equity investments	0.8
Potential earn out receivable	1.5
Carrying amount of equity investments	$ 4.0	$ 7.4