Subsequent Event (Details) In Millions, unless otherwise specified	0 Months Ended
Apr. 12, 2012 USD ($)	Apr. 12, 2012 GBP (£)
Subsequent Event [Abstract]
Subsequent event date	Apr. 12, 2012
Approximate value of intended acquisition	$ 439.0	£ 274.3
Exchange rate	1.60
Draw against revolving line of credit facility	$ 210.0
Minimum percentage of shareholders approval required for scheme	75.00%

Business Acquisition Approximate Aggregate Value Of Entity

No definition available.

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

No definition available.

+ Details

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- Definition

Minimum Percentage Of Shareholders Approval Required For Scheme

+ References

No definition available.

+ Details

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- Definition

Increase for additional borrowings on the credit facility during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 4

-Section 08

-Paragraph f

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

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- Definition

Date of subsequent event occurrence or of indication that subsequent event occurred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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