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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Details) - Floor plan interest expense $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap contract, amount of gain recognized in accumulated OCI (effective portion)	$ 0.2
Loss on cash flow hedges	(0.2)
Interest rate swap contract, amount of loss recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	$ (0.4)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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