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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Revenue from contract with customer	$ 3,700.4	$ 2,131.2	$ 6,710.5	$ 4,822.0
U.S.
Disaggregation of Revenue
Revenue from contract with customer	2,924.9	1,831.1	5,329.3	3,838.7
U.K.
Disaggregation of Revenue
Revenue from contract with customer	700.7	263.5	1,250.3	854.2
Brazil
Disaggregation of Revenue
Revenue from contract with customer	74.8	36.6	130.9	129.1
Total new and used vehicle sales
Disaggregation of Revenue
Revenue from contract with customer	3,147.3	1,752.5	5,669.7	3,960.3
Total new and used vehicle sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	2,448.4	1,487.1	4,441.4	3,092.6
Total new and used vehicle sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	634.6	235.3	1,117.2	756.2
Total new and used vehicle sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	64.3	30.1	111.1	111.4
New vehicle retail sales
Disaggregation of Revenue
Revenue from contract with customer	1,855.3	1,062.7	3,398.7	2,404.8
New vehicle retail sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	1,504.4	915.7	2,750.4	1,904.1
New vehicle retail sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	301.2	127.2	564.3	423.5
New vehicle retail sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	49.8	19.8	83.9	77.3
Used vehicle retail sales
Disaggregation of Revenue
Revenue from contract with customer	1,195.6	641.2	2,094.4	1,420.3
Used vehicle retail sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	882.9	540.9	1,579.4	1,111.2
Used vehicle retail sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	300.9	92.8	492.5	281.6
Used vehicle retail sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	11.8	7.5	22.5	27.4
Used vehicle wholesale sales
Disaggregation of Revenue
Revenue from contract with customer	96.4	48.7	176.6	135.2
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	61.2	30.5	111.6	77.3
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	32.5	15.3	60.4	51.1
Used vehicle wholesale sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	2.6	2.9	4.6	6.7
Parts and service sales
Disaggregation of Revenue
Revenue from contract with customer	392.1	282.0	752.8	652.6
Parts and service sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	332.6	254.2	628.9	558.9
Parts and service sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	50.3	21.8	106.8	78.3
Parts and service sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	9.2	5.9	17.1	15.5
Finance, insurance and other, net
Disaggregation of Revenue
Revenue from contract with customer	161.0	96.7	288.0	209.2
Variable consideration recognized relating to performance obligations satisfied in previous period	7.7	5.4	13.7	9.3
Finance, insurance and other, net | U.S.
Disaggregation of Revenue
Revenue from contract with customer	143.9	89.8	259.0	187.2
Finance, insurance and other, net | U.K.
Disaggregation of Revenue
Revenue from contract with customer	15.7	6.4	26.3	19.7
Finance, insurance and other, net | Brazil
Disaggregation of Revenue
Revenue from contract with customer	$ 1.4	$ 0.6	$ 2.8	$ 2.3

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Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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