Claims, Lawsuits And Other Contingencies (Details) (GBP £) In Millions, unless otherwise specified	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Number of actions instituted by policyholders aganist the Company (in lawsuits)	2
Reinsured policies covered by related party guarantee	£ 40

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant