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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 20,390.0	$ 21,335.7	$ 21,412.8
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	17,900.4	18,604.7	18,759.5
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,489.6	2,731.0	2,653.3
New Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,418.6	11,166.5	11,751.6
Used Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,601.3	5,466.5	5,123.3
Parts and Service [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,257.4	3,572.1	3,447.6
Finance and Insurance, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,059.3	1,023.3	981.4
Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	53.4	107.3	108.9
AN Reportable Segment, Domestic [Member]
Disaggregation of Revenue [Line Items]
Revenues	6,490.6	6,671.4	7,134.5
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,841.6	5,969.6	6,441.2
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	649.0	701.8	693.3
AN Reportable Segment, Domestic [Member] | New Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,411.1	3,502.5	3,900.8
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,781.4	1,769.5	1,725.2
AN Reportable Segment, Domestic [Member] | Parts and Service [Member]
Disaggregation of Revenue [Line Items]
Revenues	891.5	959.0	1,082.8
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues	370.5	354.6	344.4
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	36.1	85.8	81.3
AN Reportable Segment, Import [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,988.0	6,468.7	6,786.4
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,343.8	5,768.3	6,079.1
AN Reportable Segment, Import [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	644.2	700.4	707.3
AN Reportable Segment, Import [Member] | New Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,283.7	3,695.6	4,046.4
AN Reportable Segment, Import [Member] | Used Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,516.5	1,501.9	1,418.7
AN Reportable Segment, Import [Member] | Parts and Service [Member]
Disaggregation of Revenue [Line Items]
Revenues	811.3	889.7	934.8
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues	361.7	368.3	362.6
AN Reportable Segment, Import [Member] | Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	14.8	13.2	23.9
AN Reportable Segment, Premium Luxury [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,202.8	7,434.8	7,010.9
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	6,301.3	6,467.5	6,098.3
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	901.5	967.3	912.6
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,723.8	3,968.4	3,804.4
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,125.9	2,045.6	1,875.1
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,058.1	1,136.0	1,082.2
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues	294.7	279.2	246.0
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.3	5.6	3.2
Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	708.6	760.8	481.0
Corporate and Other [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	413.7	399.3	140.9
Corporate and Other [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	294.9	361.5	340.1
Corporate and Other [Member] | New Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0
Corporate and Other [Member] | Used Vehicle [Member]
Disaggregation of Revenue [Line Items]
Revenues	177.5	149.5	104.3
Corporate and Other [Member] | Parts and Service [Member]
Disaggregation of Revenue [Line Items]
Revenues	496.5	587.4	347.8
Corporate and Other [Member] | Finance and Insurance, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues	32.4	21.2	28.4
Corporate and Other [Member] | Product and Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 2.2	$ 2.7	$ 0.5

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