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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012 trusts	Dec. 31, 2011
Undrawn capital commitments	$ 127.6	$ 161.2
Number Of Trusts Entered Into Contingent Support Agreements	2
Total committed support	36.0
Guarantor obligations, increase in maximum exposure, undiscounted	66.0
Support agreements, estimated value	1.0	1.0
Global sales tax reversed	$ 19.8

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date.

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