Debt (Summary Of Additional Information Of Credit facilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 206.3	$ 204.7
Average outstanding balance	39.1	103.6
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	200.8	290.2
Average outstanding balance	7.9	70.3
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	35.0	26.7
Average outstanding balance	9.2	22.0
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	99.2	75.0
Average outstanding balance	12.2	9.2
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	15.0	0.0
Average outstanding balance	$ 1.5	$ 0.0