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Derivatives and Hedging (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Forward foreign exchange contracts | Level 2 |  |  |
Derivative |  |  |
Estimated asset of contracts designated as hedging instruments, fair value |  | $ 1.6 | $ 1.1
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt |  |  |
Derivative |  |  |
Increase in the weighted average interest rate on floor plan borrowings due to the swaps (as a percent) | 0.29% |  |
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | LIBOR portion |  |  |
Derivative |  |  |
Portion of floating rate floor plan debt fixed by swap agreements |  |  | $ 300.0
Interest rate swap, fixed (as a percent) |  |  | 2.135%
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | Fixed rate portion |  |  |
Derivative |  |  |
Portion of floating rate floor plan debt fixed by swap agreements |  |  | $ 100.0
Interest rate swap, fixed (as a percent) |  |  | 1.55%

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