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Debt (Schedule of Additional Information Related to Debt Instruments) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	$ 72.2	$ 287.7	$ 216.0	$ 296.6
Average outstanding balance	1.5	124.9	26.9	119.7
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	201.0	201.0	201.0
Average outstanding balance	0.0	161.5	15.6	127.8
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	75.0	0.0	75.0
Average outstanding balance	0.0	17.9	0.0	25.5
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	50.0	0.0	50.0
Average outstanding balance	0.0	50.0	0.0	20.3
Warehouse Facility VII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	125.0	0.0	125.0
Average outstanding balance	0.0	102.5	0.0	75.0
Warehouse Facility VIII [Member]
Debt Instrument [Line Items]
Maximum outstanding balance	0.0	149.0	0.0	149.0
Average outstanding balance	$ 0.0	$ 35.6	$ 0.0	$ 37.7

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- 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.

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- Definition

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

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