Fair Value Of Assets And Liabilities (Reconciliation Of Balance, Fair Value Measurement, Level 3) (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended		9 Months Ended		12 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 CLOs [Member]	Sep. 30, 2012 CLOs [Member]	Sep. 30, 2013 CLOs [Member]	Sep. 30, 2012 CLOs [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] EURIBOR [Member] Minimum [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] EURIBOR [Member] Maximum [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] EURIBOR [Member] Weighted Average [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] LIBOR [Member] Minimum [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] LIBOR [Member] Maximum [Member]	Dec. 31, 2012 CLOs [Member] Discounted Cash Flow [Member] Significant Unobservable Inputs [Member] LIBOR [Member] Weighted Average [Member]	Sep. 30, 2013 Other Debt Securities [Member]	Sep. 30, 2012 Other Debt Securities [Member]	Sep. 30, 2013 Other Debt Securities [Member]	Sep. 30, 2012 Other Debt Securities [Member]	Sep. 30, 2013 Note Payable [Member]	Sep. 30, 2012 Note Payable [Member]	Sep. 30, 2013 Note Payable [Member]	Sep. 30, 2012 Note Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Beginning balance (Asset)	$ 13.2	$ 0	$ 0	$ 2.4	$ 2.5	$ 2.4	$ 0							$ 6.3	$ 6.3	$ 6.3	$ 0
Beginning balance (Liability)																		(1.2)	(12.6)	(3.4)	(16.8)
Purchases					0		0								0		1.7		0		0
Settlements				(0.1)	0	(0.2)	(0.2)							0	0	0	0	0	1.6	1.7	1.6
Deconsolidation of CIPs					0		2.5								0		0		0		0
Net unrealized gains and losses included in accumulated other comprehensive income/(loss)				(0.1)	0	0	0.2							0	0	0	0	0	0	0	0
Net unrealized gains and losses included in earnings				0	0	0	0							0	0	0	0	0	0	0.1	3.5
Reclassification					0		0								0		4.6		0		0
Foreign exchange gains/(losses)				0	0	0	0							0	0	0	0	0	(0.3)	0.4	0.4
Ending balance (Asset)	13.2	0	0	2.2	2.5	2.2	2.5							6.3	6.3	6.3	6.3
Ending balance (Liability)																		$ (1.2)	$ (11.3)	$ (1.2)	$ (11.3)
Probability of Default								1.80%	5.00%		1.10%	3.00%
Assumed Default Rate, less than one year										1.80%			1.10%
Assumed Default Rate, more than one year										5.00%			3.00%
Spread over variable rate										33.00%			14.96%