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Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | $ 123.7 | $ 51.2 | $ 186.4 | $ 206.3
Average outstanding balance | 22.2 | 6.9 | 39.4 | 57.1
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 200.1 | 0.0 | 200.1 | 190.0
Average outstanding balance | 6.6 | 0.0 | 5.5 | 13.8
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 12.0 | 12.0 | 12.0 | 35.0
Average outstanding balance | 12.0 | 6.2 | 12.0 | 6.3
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 100.0 | 29.0 | 100.0 | 75.0
Average outstanding balance | 3.3 | 24.3 | 2.1 | 19.8
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum outstanding balance | 49.9 | 0.0 | 49.9 | 0.0
Average outstanding balance | $ 1.6 | $ 0.0 | $ 6.0 | $ 0.0

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