Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 24.8	$ 342.0	$ 24.8	$ 342.0
Average outstanding balance	2.0	212.0	1.4	189.4
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	251.0	251.0	251.0
Average outstanding balance	0.0	142.0	2.8	135.1
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	100.0	0.0	100.0
Average outstanding balance	0.0	23.1	0.0	11.5
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	60.0	0.0	60.0
Average outstanding balance	0.0	55.4	0.0	42.5
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	100.0	0.0	100.0
Average outstanding balance	$ 0.0	$ 47.3	$ 0.0	$ 39.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details