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Segment Information - Revenue by product type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from external customers by product type
Total revenues	$ 23,179.4	$ 22,785.1	$ 21,386.9
Retail Automotive Dealership
Revenue from external customers by product type
Total revenues	20,615.8	20,849.2	19,824.3
Retail Automotive Dealership | New vehicle
Revenue from external customers by product type
Total revenues	9,329.5	9,666.4	9,678.5
Retail Automotive Dealership | Used vehicle
Revenue from external customers by product type
Total revenues	7,241.2	7,252.1	6,386.8
Retail Automotive Dealership | Finance and insurance, net
Revenue from external customers by product type
Total revenues	652.1	629.6	581.8
Retail Automotive Dealership | Service and parts
Revenue from external customers by product type
Total revenues	2,195.9	2,151.4	2,057.5
Retail Automotive Dealership | Fleet and wholesale
Revenue from external customers by product type
Total revenues	1,197.1	1,149.7	1,119.7
Retail Automotive Dealership | Operating segments
Revenue from external customers by product type
Total revenues	20,615.8	20,849.2	19,824.3
Retail Automotive Dealership | Operating segments | New vehicle
Revenue from external customers by product type
Total revenues	9,329.5	9,666.4	9,678.5
Retail Automotive Dealership | Operating segments | Used vehicle
Revenue from external customers by product type
Total revenues	7,241.2	7,252.1	6,386.8
Retail Automotive Dealership | Operating segments | Finance and insurance, net
Revenue from external customers by product type
Total revenues	652.1	629.6	581.8
Retail Automotive Dealership | Operating segments | Service and parts
Revenue from external customers by product type
Total revenues	2,195.9	2,151.4	2,057.5
Retail Automotive Dealership | Operating segments | Fleet and wholesale
Revenue from external customers by product type
Total revenues	1,197.1	1,149.7	1,119.7
Retail Commercial Truck Dealership
Revenue from external customers by product type
Total revenues	2,050.5	1,374.5	1,048.0
Retail Commercial Truck Dealership | New vehicle
Revenue from external customers by product type
Total revenues	1,347.2	866.9	613.2
Retail Commercial Truck Dealership | Used vehicle
Revenue from external customers by product type
Total revenues	117.0	112.0	89.4
Retail Commercial Truck Dealership | Finance and insurance, net
Revenue from external customers by product type
Total revenues	12.4	11.9	8.9
Retail Commercial Truck Dealership | Service and parts
Revenue from external customers by product type
Total revenues	503.3	364.5	325.6
Retail Commercial Truck Dealership | Operating segments
Revenue from external customers by product type
Total revenues	2,050.5	1,374.5	1,048.0
Retail Commercial Truck Dealership | Operating segments | New vehicle
Revenue from external customers by product type
Total revenues	1,347.2	866.9	613.2
Retail Commercial Truck Dealership | Operating segments | Used vehicle
Revenue from external customers by product type
Total revenues	117.0	112.0	89.4
Retail Commercial Truck Dealership | Operating segments | Finance and insurance, net
Revenue from external customers by product type
Total revenues	12.4	11.9	9.0
Retail Commercial Truck Dealership | Operating segments | Service and parts
Revenue from external customers by product type
Total revenues	503.3	364.5	325.6
Retail Commercial Truck Dealership | Operating segments | Lease, rental and wholesale
Revenue from external customers by product type
Total revenues	$ 70.6	$ 19.2	$ 10.8

X

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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