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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue
Revenue from contract with customer	$ 3,509.2	$ 3,039.6	$ 10,219.7	$ 7,861.7
U.S.
Disaggregation of Revenue
Revenue from contract with customer	2,662.4	2,244.6	7,991.6	6,083.3
U.K.
Disaggregation of Revenue
Revenue from contract with customer	750.4	740.8	2,000.7	1,595.0
Brazil
Disaggregation of Revenue
Revenue from contract with customer	96.4	54.3	227.3	183.4
Total new and used vehicle sales
Disaggregation of Revenue
Revenue from contract with customer	2,933.9	2,534.6	8,603.6	6,494.8
Total new and used vehicle sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	2,178.8	1,825.2	6,620.2	4,917.8
Total new and used vehicle sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	671.5	664.2	1,788.7	1,420.4
Total new and used vehicle sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	83.6	45.2	194.7	156.6
New vehicle retail sales
Disaggregation of Revenue
Revenue from contract with customer	1,576.2	1,580.7	4,974.9	3,985.5
New vehicle retail sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	1,208.5	1,172.2	3,958.9	3,076.3
New vehicle retail sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	305.4	376.6	869.7	800.1
New vehicle retail sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	62.3	31.9	146.3	109.1
Used vehicle retail sales
Disaggregation of Revenue
Revenue from contract with customer	1,248.3	867.2	3,342.7	2,287.4
Used vehicle retail sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	902.3	608.2	2,481.7	1,719.4
Used vehicle retail sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	328.0	248.1	820.5	529.7
Used vehicle retail sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	18.0	10.9	40.5	38.3
Used vehicle wholesale sales
Disaggregation of Revenue
Revenue from contract with customer	109.4	86.7	286.0	221.9
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	68.0	44.8	179.6	122.1
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	38.1	39.5	98.4	90.6
Used vehicle wholesale sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	3.3	2.4	8.0	9.2
Parts and service sales
Disaggregation of Revenue
Revenue from contract with customer	427.6	375.6	1,180.4	1,028.2
Parts and service sales | U.S.
Disaggregation of Revenue
Revenue from contract with customer	353.1	306.4	982.0	865.2
Parts and service sales | U.K.
Disaggregation of Revenue
Revenue from contract with customer	63.4	61.3	170.2	139.5
Parts and service sales | Brazil
Disaggregation of Revenue
Revenue from contract with customer	11.1	8.0	28.2	23.4
Finance, insurance and other, net
Disaggregation of Revenue
Revenue from contract with customer	147.7	129.5	435.7	338.7
Variable consideration recognized relating to performance obligations satisfied in previous period	5.1	7.6	18.7	16.9
Finance, insurance and other, net | U.S.
Disaggregation of Revenue
Revenue from contract with customer	130.5	113.0	389.4	300.2
Finance, insurance and other, net | U.K.
Disaggregation of Revenue
Revenue from contract with customer	15.6	15.4	41.9	35.1
Finance, insurance and other, net | Brazil
Disaggregation of Revenue
Revenue from contract with customer	$ 1.7	$ 1.1	$ 4.4	$ 3.4

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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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