Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
SBI USA Fund [Member]
Variable Interest Entity [Line Items]
Commitment funded	$ 35.5
Carrying amount of equity investment	25.2
Maximum amount committed to invest as per agreement	75.0
JEP IV [Member]
Variable Interest Entity [Line Items]
Fair Value of aggregate principal balance	21.6
Carrying amount of equity investment	1.5
Maximum amount committed to invest as per agreement	33.0
Collateralized Loan Obligations [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Fair Value of Debt Securities	$ 4.2