Debt (Schedule Of Outstanding Debt Amount) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Balance outstanding	$ 102.8		$ 43.5
Balance outstanding	935.6		853.0
Restricted cash and cash equivalents pledged as collateral	111.3		92.4
Balance outstanding	350.2		350.3
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Balance outstanding	102.8		43.5
Amount available for borrowing	132.2	[1]	191.5	[1]
Interest rate	2.04%		2.08%
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Balance outstanding			81.3
Amount available for borrowing	325.0	[1]	243.7	[1]
Loans pledged as collateral			105.2
Restricted cash and cash equivalents pledged as collateral	1.2		3.0
Interest rate	2.17%		2.22%
Warehouse Facility III [Member]
Debt Instrument [Line Items]
Balance outstanding
Amount available for borrowing	75.0	[1]	75.0	[1]
Loans pledged as collateral
Restricted cash and cash equivalents pledged as collateral	0.3		0.4
Interest rate	1.77%		1.82%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Balance outstanding			37.6
Amount available for borrowing	75.0	[1]	37.4	[1]
Loans pledged as collateral			47.7
Restricted cash and cash equivalents pledged as collateral	0.2		2.5
Interest rate	2.17%		2.96%
Term ABS 2010-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			80.3
Loans pledged as collateral			111.6
Restricted cash and cash equivalents pledged as collateral			12.5
Interest rate			2.44%
Term ABS 2011-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	144.2		200.5
Loans pledged as collateral	215.3		243.8
Restricted cash and cash equivalents pledged as collateral	23.2		23.5
Interest rate	3.01%		2.90%
Term ABS 2012-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	201.3		201.3
Loans pledged as collateral	240.4		244.7
Restricted cash and cash equivalents pledged as collateral	23.5		22.3
Interest rate	2.38%		2.38%
Term ABS 2012-2 [Member]
Debt Instrument [Line Items]
Balance outstanding	252.0		252.0
Loans pledged as collateral	303.8		311.9
Restricted cash and cash equivalents pledged as collateral	27.7		26.0
Interest rate	1.63%		1.63%
Term ABS 2013-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	140.3
Loans pledged as collateral	184.3
Restricted cash and cash equivalents pledged as collateral	15.3
Interest rate	1.31%
Term ABS 2013-2 [Member]
Debt Instrument [Line Items]
Balance outstanding	197.8
Loans pledged as collateral	250.5
Restricted cash and cash equivalents pledged as collateral	18.7
Interest rate	1.67%
Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding	350.2	[2]	350.3	[2]
Interest rate	9.13%		9.13%
Unamortized debt premium net	$ 0.2		$ 0.3

[1] Availability may be limited by the amount of assets pledged as collateral.

[2] As of December 31, 2013 and 2012, the outstanding balance presented for the senior notes includes a net unamortized debt premium of $0.2 million and $0.3 million, respectively.