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Acquisitions (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 01, 2018 store	Feb. 26, 2018 store	Aug. 07, 2017 store	May 01, 2017 store
Business Acquisition [Line Items]
Acquisition expense recognized | $	$ 0.2	$ 3.5	$ 4.3	$ 5.7
Day Auto Group
Business Acquisition [Line Items]
Number of stores acquired						7
Prestige Auto Group
Business Acquisition [Line Items]
Number of stores acquired					6
Baierl Auto Group
Business Acquisition [Line Items]
Number of stores acquired								8
Downtown LA Auto Group
Business Acquisition [Line Items]
Number of stores acquired							7

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Number of Stores Acquired

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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