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Derivatives and Hedging (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015
Forward foreign exchange contracts | Level 2 |  |
Derivative |  |
Estimated liability of contracts designated as hedging instruments, fair value |  | $ 1.1
Estimated asset of contracts designated as hedging instruments, fair value | $ 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) | 0.30% |
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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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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