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Subsequent Events (Details)	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2014 GBP (£)	Sep. 30, 2013 GBP (£)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Nov. 05, 2014 Subsequent Event USD ($)
Subsequent Event [Line Items]
Cash dividend per share of common stock declared	£ 570	£ 500	$ 1,710	$ 1,500	$ 0.62

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration