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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

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