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v3.19.2

Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | $ 282.9 | $ 265.4 | $ 282.9 | $ 265.4
Average outstanding balance | 81.0 | 73.2 | 84.7 | 56.3
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 201.0 | 201.0 | 201.0 | 201.0
Average outstanding balance | 88.4 | 4.4 | 90.7 | 4.4
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 99.0 | 100.0 | 99.0
Average outstanding balance | 0.0 | 2.2 | 2.2 | 1.1
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 0.0 | 0.0 | 99.0
Average outstanding balance | 0.0 | 0.0 | 0.0 | 1.1
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 | 0.8
Warehouse Facility VII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 25.0 | 150.0 | 101.5 | 150.0
Average outstanding balance | $ 1.9 | $ 26.4 | $ 2.1 | $ 14.6

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