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v3.21.2

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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