Debt (Summary Of Additional Information Of Credit facilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 355.5	$ 379.7
Average outstanding balance	156.8	133.4
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	201.0	201.0
Average outstanding balance	74.3	83.0
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	100.0	43.8
Average outstanding balance	14.0	4.3
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	82.0	0.0
Average outstanding balance	5.2	0.0
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	50.0
Average outstanding balance	0.0	23.1
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	82.0	48.2
Average outstanding balance	$ 5.2	$ 4.7