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Segment Information (Details) $ in Millions		12 Months Ended
		Dec. 31, 2017 USD ($) segments	Dec. 31, 2016 USD ($) segments	Dec. 31, 2015 USD ($) segments
Segment Reporting Information [Line Items]
Number of reportable segments | segments		3	3	3
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		$ 21,534.6	$ 21,609.0	$ 20,862.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	909.0	958.1	1,024.5
Corporate and other		(162.6)	(145.1)	(209.7)
Other interest expense		(120.2)	(115.5)	(90.9)
Interest income		1.0	1.1	0.1
Other income (loss), net		9.3	3.7	(1.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		636.5	702.3	722.7
Floorplan Interest Expense [Abstract]
Floorplan interest expense		97.0	76.5	58.3
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		158.6	143.4	127.4
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		332.9	253.2	266.9
Assets [Abstract]
Assets		10,271.5	10,060.0	9,548.2
AN Reportable Segments [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		21,158.9	21,361.4	20,714.8
AN Reportable Segment, Domestic [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		7,452.8	7,810.0	7,069.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	257.1	311.1	336.9
Floorplan Interest Expense [Abstract]
Floorplan interest expense		40.9	33.7	24.1
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		38.2	37.5	31.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		36.2	62.5	61.4
Assets [Abstract]
Assets		2,563.9	2,742.8	2,573.9
AN Reportable Segment, Import [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		6,873.4	6,886.1	7,037.2
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	303.1	296.8	311.4
Floorplan Interest Expense [Abstract]
Floorplan interest expense		23.2	17.4	15.0
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		34.3	35.4	32.9
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		32.8	28.0	34.0
Assets [Abstract]
Assets		1,992.6	2,065.5	2,145.2
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		6,832.7	6,665.3	6,607.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	348.8	350.2	376.2
Floorplan Interest Expense [Abstract]
Floorplan interest expense		28.4	22.7	18.0
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		44.5	40.7	35.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		101.7	95.6	101.9
Assets [Abstract]
Assets		2,716.8	2,603.4	2,554.6
Corporate and Other [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		375.7	247.6	147.2
Floorplan Interest Expense [Abstract]
Floorplan interest expense		4.5	2.7	1.2
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		41.6	29.8	28.5
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		162.2	67.1	69.6
Corporate and Other [Member] | Goodwill [Member]
Assets [Abstract]
Assets		1,515.0	1,511.3	1,394.5
Corporate and Other [Member] | Franchise Rights [Member]
Assets [Abstract]
Assets		572.2	589.4	432.4
Corporate and Other [Member] | Other Corporate and Other Assets [Member]
Assets [Abstract]
Assets		$ 911.0	$ 547.6	$ 447.6
[1] Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

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Operating income related to other businesses, including collision centers, customer lead distribution business, and an auction operation, each of which generates revenues. Amount also includes unallocated corporate overhead expenses, floorplan interest expense on used floorplan facilities, and retrospective commissions.

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