Debt (Summary Of Additional Information Of Credit facilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 379.7	$ 229.0
Average outstanding balance	133.4	29.1
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	201.0	201.0
Average outstanding balance	83.0	18.8
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	43.8	0.0
Average outstanding balance	4.3	0.0
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	0.0
Average outstanding balance	0.0	0.0
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	50.0	0.0
Average outstanding balance	23.1	0.0
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	48.2	0.0
Average outstanding balance	$ 4.7	$ 0.0