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Segment Information (Details) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($) segments	Dec. 31, 2014 USD ($) segments	Dec. 31, 2013 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		$ 20,862.0	$ 19,108.8	$ 17,517.6
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	1,024.5	942.4	848.1
Corporate and other		(209.7)	(174.9)	(161.2)
Other interest expense		(90.9)	(86.7)	(88.3)
Loss on debt extinguishment		0.0	(1.6)	0.0
Interest income		0.1	0.2	0.2
Other income (loss), net		(1.3)	2.9	5.6
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		722.7	682.3	604.4
Floorplan Interest Expense [Abstract]
Floorplan interest expense		58.3	53.3	53.4
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		127.4	106.9	95.3
Assets [Abstract]
Assets		9,558.3	8,399.7	7,914.1
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		266.9	197.8	207.2
AN Reportable Segment, Domestic [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		7,069.8	6,359.5	5,835.3
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	336.9	285.0	246.6
Floorplan Interest Expense [Abstract]
Floorplan interest expense		24.1	24.4	23.7
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		31.0	27.3	25.1
Assets [Abstract]
Assets		2,573.9	2,187.3	2,143.1
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		61.4	61.7	61.9
AN Reportable Segment, Import [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		7,037.2	6,717.8	6,375.0
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	311.4	291.3	280.1
Floorplan Interest Expense [Abstract]
Floorplan interest expense		15.0	14.5	16.3
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		32.9	31.0	28.1
Assets [Abstract]
Assets		2,145.2	1,997.7	2,030.4
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		34.0	47.0	76.1
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		6,607.8	5,889.3	5,152.3
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Total segment income	[1]	376.2	366.1	321.4
Floorplan Interest Expense [Abstract]
Floorplan interest expense		18.0	13.1	12.6
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		35.0	28.3	26.9
Assets [Abstract]
Assets		2,554.6	2,051.0	1,633.6
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		101.9	68.3	45.5
AN Reportable Segments [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		20,714.8	18,966.6	17,362.6
Corporate and Other [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total revenues		147.2	142.2	155.0
Floorplan Interest Expense [Abstract]
Floorplan interest expense		1.2	1.3	0.8
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization		28.5	20.3	15.2
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Capital expenditures		69.6	20.8	23.7
Goodwill [Member] | Corporate and Other [Member]
Assets [Abstract]
Assets		1,394.5	1,314.7	1,259.6
Franchise Rights [Member] | Corporate and Other [Member]
Assets [Abstract]
Assets		432.4	348.1	329.3
Other Corporate and Other Assets [Member] | Corporate and Other [Member]
Assets [Abstract]
Assets		$ 457.7	$ 500.9	$ 518.1
[1] Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

X

- Definition

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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