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Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 300.1	$ 302.2	$ 342.0	$ 355.5
Average outstanding balance	125.6	171.1	168.0	152.4
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	201.0	201.0	251.0	201.0
Average outstanding balance	102.8	86.2	124.2	55.2
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	0.0	0.0	100.0	0.0
Average outstanding balance	0.0	0.0	7.7	0.0
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	75.0	0.0	75.0	0.0
Average outstanding balance	61.1	0.0	48.8	0.0
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	0.0	100.0	0.0
Average outstanding balance	$ 0.0	$ 0.0	$ 25.9	$ 0.0

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