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Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Total revenues	$ 5,755.8	$ 5,940.3	$ 11,320.2	$ 11,687.2
Retail Commercial Truck Dealership
Revenues
Total revenues	426.8	338.8	759.1	631.2
New vehicle | Retail Commercial Truck Dealership
Revenues
Total revenues	296.0	210.7	503.4	381.1
Used vehicle | Retail Commercial Truck Dealership
Revenues
Total revenues	27.6	27.3	51.7	53.8
Finance and insurance, net | Retail Commercial Truck Dealership
Revenues
Total revenues	2.9	3.6	5.9	6.8
Service and parts | Retail Commercial Truck Dealership
Revenues
Total revenues	94.6	92.2	186.1	182.6
Other | Retail Commercial Truck Dealership
Revenues
Total revenues	$ 5.7	$ 5.0	$ 12.0	$ 6.9

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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
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-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
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