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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | $ 193.3 | $ 153.9 | $ 282.9 | $ 265.4
Average outstanding balance | 71.1 | 22.2 | 80.1 | 44.8
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 201.0 | 201.0 | 201.0 | 201.0
Average outstanding balance | 126.7 | 4.4 | 102.8 | 4.4
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 0.0 | 100.0 | 99.0
Average outstanding balance | 0.0 | 0.0 | 1.5 | 0.7
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 35.0 | 97.3 | 35.0 | 99.0
Average outstanding balance | 3.4 | 2.1 | 1.2 | 1.4
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 0.0 | 0.0 | 75.0
Average outstanding balance | 0.0 | 0.0 | 0.0 | 0.5
Warehouse Facility VII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 50.0 | 100.0 | 101.5 | 150.0
Average outstanding balance | 23.9 | 2.2 | 9.4 | 10.4
Warehouse Facility VIII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 75.0 | 0.0 | 75.0 | 0.0
Average outstanding balance | $ 12.7 | $ 0.0 | $ 12.7 | $ 0.0

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