Balance Sheet Reclassification (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Balance Sheet Reclassification [Abstract]
Reclassification amount with no effect	$ 2.2

Indebtedness not included on the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Rule 15c3

-Number 240

-Section 3

-Subparagraph i

-Article 15c3

Name:	us-gaap_ItemsNotIncludedInConsolidatedStatementOfFinancialCondition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant