Debt (Summary Of Additional Information Of Credit facilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 179.0	$ 139.0	$ 195.1	$ 187.3
Average outstanding balance	70.5	100.1	94.4	98.9
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	169.1	173.8	169.1	177.2
Average outstanding balance	136.0	143.7	91.5	128.6
Warehouse Facility III [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	46.9	62.0	60.0	73.0
Average outstanding balance	42.0	51.4	27.5	60.8
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance		39.2	39.6	39.6
Average outstanding balance		$ 37.8	$ 15.7	$ 37.8