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Segment Information (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues and segment income by reportable segment
Revenue	$ 4,960.1	$ 4,396.7	$ 14,363.6	$ 12,806.4
Segment income	129.3	117.0	388.4	339.8
Intersegment Elimination
Revenues and segment income by reportable segment
Revenue	(0.5)	(1.6)	(1.1)	(3.8)
Retail Automotive | Operating segments
Revenues and segment income by reportable segment
Revenue	4,585.8	4,295.6	13,327.5	12,495.3
Segment income	107.8	101.5	330.9	300.8
Retail Commercial Truck Dealership | Operating segments
Revenues and segment income by reportable segment
Revenue	268.5		703.1
Segment income	10.3	1.5	28.1	2.9
Other | Operating segments
Revenues and segment income by reportable segment
Revenue	106.3	102.7	334.1	314.9
Segment income	$ 11.2	$ 14.0	$ 29.4	$ 36.1

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 940



-SubTopic 20



-Section 25



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-Section S99



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-Number 210



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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



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