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Condensed Consolidating Financial Information - Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Income Statements, Captions [Line Items]
Revenues	$ 3,118.3	$ 2,889.1	$ 8,932.4	$ 8,692.5
Cost of sales	2,652.7	2,454.0	7,581.0	7,399.5
GROSS PROFIT	465.6	435.1	1,351.4	1,293.0
Selling, general and administrative expenses	354.0	316.8	1,020.4	949.2
Depreciation and amortization expense	18.0	16.9	53.0	50.0
Asset impairments	10.3	23.2	10.8	27.4
INCOME (LOSS) FROM OPERATIONS	83.3	78.2	267.2	266.4
Floorplan interest expense	15.4	14.7	47.0	43.3
Other interest expense, net	18.9	19.1	55.8	57.4
INCOME (LOSS) BEFORE INCOME TAXES	49.0	44.4	164.4	165.7
(Benefit) provision for income taxes	11.0	9.6	38.5	38.6
Equity in earnings of subsidiaries	0.0	0.0	0.0	0.0
NET INCOME (LOSS)	38.0	34.8	125.9	127.1
Comprehensive income (loss)	(17.0)	(2.4)	(31.7)	(5.5)
Comprehensive income (loss) attributable to parent	21.0	32.4	94.2	121.6
Elimination
Condensed Income Statements, Captions [Line Items]
Revenues	0.0	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0	0.0
GROSS PROFIT	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0	0.0
Depreciation and amortization expense	0.0	0.0	0.0	0.0
Asset impairments	0.0	0.0	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	0.0	0.0	0.0	0.0
Floorplan interest expense	0.0	0.0	0.0	0.0
Other interest expense, net	0.0	0.0	0.0	0.0
INCOME (LOSS) BEFORE INCOME TAXES	0.0	0.0	0.0	0.0
(Benefit) provision for income taxes	0.0	0.0	0.0	0.0
Equity in earnings of subsidiaries	(38.4)	(35.0)	(128.5)	(129.1)
NET INCOME (LOSS)	(38.4)	(35.0)	(128.5)	(129.1)
Comprehensive income (loss)	17.0	0.0	31.8	0.0
Comprehensive income (loss) attributable to parent	(21.4)	(35.0)	(96.7)	(129.1)
Group 1 Automotive, Inc. | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Revenues	0.0	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0	0.0
GROSS PROFIT	0.0	0.0	0.0	0.0
Selling, general and administrative expenses	0.4	0.3	3.4	2.7
Depreciation and amortization expense	0.0	0.0	0.0	0.0
Asset impairments	0.0	0.0	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	(0.4)	(0.3)	(3.4)	(2.7)
Floorplan interest expense	0.0	0.0	0.0	0.0
Other interest expense, net	0.0	0.0	0.0	0.0
INCOME (LOSS) BEFORE INCOME TAXES	(0.4)	(0.3)	(3.4)	(2.7)
(Benefit) provision for income taxes	(0.1)	(0.1)	(0.8)	(0.6)
Equity in earnings of subsidiaries	38.4	35.0	128.5	129.1
NET INCOME (LOSS)	38.1	34.8	125.9	127.1
Comprehensive income (loss)	(17.0)	0.0	(31.7)	0.0
Comprehensive income (loss) attributable to parent	21.1	34.8	94.2	127.1
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Revenues	2,422.8	2,200.3	6,764.3	6,456.7
Cost of sales	2,035.9	1,847.8	5,653.8	5,417.9
GROSS PROFIT	386.9	352.5	1,110.5	1,038.8
Selling, general and administrative expenses	283.7	240.2	801.3	721.3
Depreciation and amortization expense	13.8	13.5	41.3	39.4
Asset impairments	3.3	23.2	3.2	27.4
INCOME (LOSS) FROM OPERATIONS	86.1	75.6	264.7	250.7
Floorplan interest expense	13.3	12.9	41.3	38.0
Other interest expense, net	16.6	17.2	50.4	51.6
INCOME (LOSS) BEFORE INCOME TAXES	56.2	45.5	173.0	161.1
(Benefit) provision for income taxes	12.8	9.2	41.0	36.5
Equity in earnings of subsidiaries	0.0	0.0	0.0	0.0
NET INCOME (LOSS)	43.4	36.3	132.0	124.6
Comprehensive income (loss)	(5.4)	3.5	(19.8)	16.7
Comprehensive income (loss) attributable to parent	38.0	39.8	112.2	141.3
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Revenues	695.5	688.8	2,168.1	2,235.8
Cost of sales	616.8	606.2	1,927.2	1,981.6
GROSS PROFIT	78.7	82.6	240.9	254.2
Selling, general and administrative expenses	69.9	76.3	215.7	225.2
Depreciation and amortization expense	4.2	3.4	11.7	10.6
Asset impairments	7.0	0.0	7.6	0.0
INCOME (LOSS) FROM OPERATIONS	(2.4)	2.9	5.9	18.4
Floorplan interest expense	2.1	1.8	5.7	5.3
Other interest expense, net	2.3	1.9	5.4	5.8
INCOME (LOSS) BEFORE INCOME TAXES	(6.8)	(0.8)	(5.2)	7.3
(Benefit) provision for income taxes	(1.7)	0.5	(1.7)	2.8
Equity in earnings of subsidiaries	0.0	0.0	0.0	0.0
NET INCOME (LOSS)	(5.1)	(1.3)	(3.5)	4.5
Comprehensive income (loss)	(11.6)	(5.9)	(12.0)	(22.2)
Comprehensive income (loss) attributable to parent	$ (16.7)	$ (7.2)	$ (15.5)	$ (17.7)

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