Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Other Comprehensvie Income Loss Reclassification Adjustment From AOCI on Derivative Instruments, Gross		$ 2,600,000	$ 13,100,000
Derivatives designated for hedges of investments in foreign operations		0
Losses on derivative instruments as a result of counterparty nonperformance		0
Derivative Liability, Fair Value, Gross Liability		68,400,000
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		1,600,000	3,100,000
Fair values of derivative liabilities reduced (increased) by net credit valuation adjustments		(2,400,000)	(200,000)
Cash collateral used to offset fair value amount under master neeting arrangements		0	0
Notional Amount of Derivatives			9,500,000,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,000,000
Notional amount of bank CDO securities credit risk assumed		1,160,000,000
Notional amount of bank and insurance trust preferred CDOs		4,979,378,000	4,536,509,000
Cash collateral pledged for derivative liabilities		34,900,000
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		1,500,000
Payment resulting from the termination of the interest rate swaps with Deutsche Bank		0
Total Return Swap [Member]
Derivative [Line Items]
Expected net quarterly costs		$ 5,400,000