Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ (9.4)
Net operating loss carryforwards, expiration date	2029
Tax credit carryforwards, expiration date	2031
Estimated interest and penalties	0	0.1	0.1
Accrued estimated interest and penalties	0.3
Cumulative undistributed foreign earnings	33.2
Unrecognized deferred tax liability related to undistributed earnings	0
Years currently under income tax examination by the Internal Revenue Service	fiscal years 2009 and 2010
2024 Expiration [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	75.1
Indefinite-Lived Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	16.2
Tax credit carryforwards	0.2
2031 Expiration [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	12.5
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expected change in unrecognized tax positions	0.2
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expected change in unrecognized tax positions	$ 1.3