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Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |  |  |
Interest rate caps, fair value of less than $0.1 million |  | $ 0.0 |  | $ 0.1
Warehouse Facility II [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | [1],[2] | 400.0 |  |
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  | 400.0 |  | 400.0
Notional Amount |  | $ 205.0 |  | $ 205.0
Cap Interest Rate | [3] | 5.50% |  | 5.50%
Warehouse Facility IV [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  | $ 300.0 | [1],[2] | $ 300.0
Notional Amount |  | 300.0 |  | 300.0
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  |  |  | $ 100.0
Cap Interest Rate | [3] |  |  | 6.50%
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  | $ 100.0 |  | $ 150.0
Cap Interest Rate | [3] | 6.50% |  | 6.50%
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate Additional [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  | $ 150.0 |  | $ 50.0
Cap Interest Rate | [3] | 6.50% |  | 6.50%
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate Second Additional [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  | $ 50.0 |  |
Cap Interest Rate | [3] | 6.50% |  |
Warehouse Facility V [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | [1],[2] | $ 100.0 |  |
Warehouse Facility V [Member] | 6.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  | 100.0 |  | $ 100.0
Notional Amount |  | $ 75.0 |  | $ 75.0
Cap Interest Rate | [3] | 6.50% |  | 6.50%
Warehouse Facility VII [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | [1],[2] | $ 150.0 |  |
Notional Amount |  | 150.0 |  |
Warehouse Facility VII [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  | 150.0 |  |
Notional Amount |  | $ 125.0 |  |
Cap Interest Rate | [3] | 5.50% |  |
Warehouse Facility VII [Member] | 5.50% Cap Interest Rate Additional [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  | $ 25.0 |  |
Cap Interest Rate | [3] | 5.50% |  |
Warehouse Facility VII [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  |  |  | $ 150.0
Notional Amount |  |  |  | $ 143.8
Cap Interest Rate | [3] |  |  | 5.50%
Warehouse Facility VIII [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount | [1],[2] | $ 200.0 |  |
Warehouse Facility VIII [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt facility financing amount |  | 200.0 |  | $ 200.0
Notional Amount |  | $ 200.0 |  | $ 200.0
Cap Interest Rate | [3] | 5.50% |  | 5.50%
[1] | Financing made available only to a specified subsidiary of the Company.
[2] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates
[3] | Rate excludes the spread over the LIBOR or commercial paper rate.

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