Debt (Summary Of Additional Information Of Credit facilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 195.1	$ 187.3	$ 195.1	$ 187.3
Average outstanding balance	139.6	93.8	106.6	98.2
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	162.6	163.9	162.6	177.2
Average outstanding balance	48.0	83.0	68.9	121.0
Warehouse Facility III [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	60.0	71.5	60.0	73.0
Average outstanding balance	40.0	63.7	20.1	65.5
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	37.6	39.2	39.6	39.6
Average outstanding balance	$ 9.9	$ 37.8	$ 23.7	$ 37.9