Financial Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Total net up-front payments received	$ 10.6	$ 2.5
Forwards [Member]
Derivative [Line Items]
Average Monthly Notional Amount	56.00%
Option [Member]
Derivative [Line Items]
Average Monthly Notional Amount	263.00%	387.00%
Futures [Member]
Derivative [Line Items]
Average Monthly Notional Amount	96.00%	179.00%
Credit Default Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	105.00%	174.00%
Interest Rate Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	165.00%	187.00%
Total Return Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	164.00%	210.00%