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Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 342.0	$ 355.5	$ 342.0	$ 355.5
Average outstanding balance	212.0	162.5	189.4	142.9
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	251.0	201.0	251.0	201.0
Average outstanding balance	142.0	59.6	135.1	39.4
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	0.0	0.0	0.0
Average outstanding balance	0.0	0.0	0.0	0.0
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	100.0	0.0	100.0	0.0
Average outstanding balance	23.1	0.0	11.5	0.0
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	60.0	0.0	60.0	0.0
Average outstanding balance	55.4	0.0	42.5	0.0
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	100.0	0.0	100.0	0.0
Average outstanding balance	$ 47.3	$ 0.0	$ 39.0	$ 0.0

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