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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | $ 92.1 | $ 142.6 | $ 186.4 | $ 206.3
Average outstanding balance | 13.3 | 30.0 | 30.6 | 48.0
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 200.8 | 200.1 | 200.8
Average outstanding balance | 0.0 | 4.4 | 3.7 | 10.6
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 12.0 | 12.0 | 12.0 | 35.0
Average outstanding balance | 12.0 | 12.0 | 12.0 | 8.2
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 99.2 | 100.0 | 99.2
Average outstanding balance | 0.0 | 9.6 | 1.4 | 16.4
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 0.0 | 0.0 | 49.9 | 0.0
Average outstanding balance | $ 0.0 | $ 0.0 | $ 4.0 | $ 0.0

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