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Segment Information (Details) $ in Millions		12 Months Ended
		Dec. 31, 2016 USD ($) segments	Dec. 31, 2015 USD ($) segments	Dec. 31, 2014 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		$ 21,609.0	$ 20,862.0	$ 19,108.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	958.1	1,024.5	942.4
Corporate and other		(145.1)	(209.7)	(174.9)
Other interest expense		(115.5)	(90.9)	(86.7)
Loss on debt extinguishment		0.0	0.0	(1.6)
Interest income		1.1	0.1	0.2
Other income (loss), net		3.7	(1.3)	2.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		702.3	722.7	682.3
Floorplan Interest Expense [Abstract]
Floorplan interest expense		76.5	58.3	53.3
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		143.4	127.4	106.9
Assets [Abstract]
Assets		10,060.0	9,548.2	8,395.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		253.2	266.9	197.8
AN Reportable Segment, Domestic [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		7,810.0	7,069.8	6,359.5
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	311.1	336.9	285.0
Floorplan Interest Expense [Abstract]
Floorplan interest expense		33.7	24.1	24.4
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		37.5	31.0	27.3
Assets [Abstract]
Assets		2,742.8	2,573.9	2,187.3
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		62.5	61.4	61.7
AN Reportable Segment, Import [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		6,886.1	7,037.2	6,717.8
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	296.8	311.4	291.3
Floorplan Interest Expense [Abstract]
Floorplan interest expense		17.4	15.0	14.5
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		35.4	32.9	31.0
Assets [Abstract]
Assets		2,065.5	2,145.2	1,997.7
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		28.0	34.0	47.0
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		6,665.3	6,607.8	5,889.3
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	350.2	376.2	366.1
Floorplan Interest Expense [Abstract]
Floorplan interest expense		22.7	18.0	13.1
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		40.7	35.0	28.3
Assets [Abstract]
Assets		2,603.4	2,554.6	2,051.0
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		95.6	101.9	68.3
AN Reportable Segments [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		21,361.4	20,714.8	18,966.6
Corporate and Other [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		247.6	147.2	142.2
Floorplan Interest Expense [Abstract]
Floorplan interest expense		2.7	1.2	1.3
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		29.8	28.5	20.3
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		67.1	69.6	20.8
Corporate and Other [Member] | Goodwill [Member]
Assets [Abstract]
Assets		1,511.3	1,394.5	1,314.7
Corporate and Other [Member] | Franchise Rights [Member]
Assets [Abstract]
Assets		589.4	432.4	348.1
Corporate and Other [Member] | Other Corporate and Other Assets [Member]
Assets [Abstract]
Assets		$ 547.6	$ 447.6	$ 496.2
[1] Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

X

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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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