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Debt (Schedule of Additional Information Related to Debt Instruments) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 379.7	$ 129.4	$ 379.7	$ 216.0
Average outstanding balance	242.7	11.0	144.6	39.8
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	201.0	201.0	201.0	201.0
Average outstanding balance	167.9	4.4	88.8	23.5
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	43.8	0.0	43.8	0.0
Average outstanding balance	17.2	0.0	8.6	0.0
Warehouse Facility V [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 VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	50.0	0.0	50.0	0.0
Average outstanding balance	1.1	0.0	0.6	0.0
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	48.2	0.0	48.2	0.0
Average outstanding balance	$ 18.9	$ 0.0	$ 9.5	$ 0.0

X

- Definition

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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- Definition

Average amount borrowed under the credit facility during the period.

+ References

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

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