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Counterparty Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Counterparty Risk [Abstract]
Investments held with dealers as collateral	$ 838.7
Investments securities held as collateral	36.6
Unencumbered investments held in custody	$ 227.1
Concentration risk threshold	15.00%

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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