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Derivatives and Hedging (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2014 Interest Rate Swap Agreements | Dec. 31, 2013 Interest Rate Swap Agreements | Jun. 30, 2014 Interest Rate Swap Agreements Fair Value, Inputs, Level 2 | Dec. 31, 2013 Interest Rate Swap Agreements Fair Value, Inputs, Level 2 | Jun. 30, 2014 Interest Rate Swap Agreements Floating Rate Floor Plan Debt | Jun. 30, 2014 Interest Rate Swap Agreements Floating Rate Floor Plan Debt | Jun. 30, 2014 Interest Rate Swap Agreements Floating Rate Floor Plan Debt LIBOR portion | Jun. 30, 2014 Interest Rate Swap Agreements Floating Rate Floor Plan Debt Fixed rate portion | Jun. 30, 2014 Forward foreign exchange contracts Fair Value, Inputs, Level 2 | Dec. 31, 2013 Forward foreign exchange contracts Fair Value, Inputs, Level 2
Derivative |  |  |  |  |  |  |  |  |  |
Portion of floating rate floor plan debt fixed by swap agreements |  |  |  |  |  |  | $ 300.0 | $ 100.0 |  |
Interest rate swap, fixed (as a percent) |  |  |  |  |  |  | 2.135% | 1.55% |  |
Estimated liabilities of swaps designated as hedging instruments, fair value |  |  | 4.3 | 7.7 |  |  |  |  | 0.8 | 2.2
Hedge ineffectiveness recorded | $ 0 | $ 0 |  |  |  |  |  |  |  |
Increase in the weighted average interest rate on floor plan borrowings due to the swaps (as a percent) |  |  |  |  | 0.28% | 0.28% |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Represents the impact on the weighted average interest rate from interest rate swaps for the period. + References No definition available. + Details
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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. + References Reference 1: 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=28370219&loc=SL20226000-175313 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=20225523&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=7476318&loc=SL5624163-113959 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of gain recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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