Debt (Summary Of Additional Information Of Credit facilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 187.3	$ 185.1
Average outstanding balance	96.2	109.3
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	177.2	264.0
Average outstanding balance	99.8	159.5
Warehouse Facility III [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	73.0	75.0
Average outstanding balance	45.5	53.7
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	39.6	43.5
Average outstanding balance	$ 37.8	$ 41.3