$GPI
Group 1 Automotive Inc Stock $gpi

$gpi Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000103120319000029 Filed on October 30, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$3.111B	$3.118B	$2.889B
YoY Change	6.97%	7.93%	-4.09%
Cost Of Revenue	$2.647B	$2.653B	$2.454B
YoY Change	6.87%	8.1%	-4.92%
Gross Profit	$464.6M	$465.6M	$435.1M
YoY Change	7.52%	7.01%	0.85%
Gross Profit Margin	14.93%	14.93%	15.06%
Selling, General & Admin	$338.0M	$353.9M	$316.8M
YoY Change	4.39%	11.71%	-3.51%
% of Gross Profit	72.75%	76.01%	72.81%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.60M	$18.20M	$16.90M
YoY Change	8.77%	7.69%	12.23%
% of Gross Profit	4.0%	3.91%	3.88%
Operating Expenses	$356.7M	$353.9M	$316.8M
YoY Change	4.6%	11.71%	-3.51%
Operating Profit	$96.50M	$83.30M	$78.20M
YoY Change	29.18%	6.52%	-0.39%
Interest Expense	-$33.70M	-$34.30M	-$33.80M
YoY Change	-3.71%	1.48%	7.64%
% of Operating Profit	-34.92%	-41.18%	-43.22%
Other Income/Expense, Net	$100.0K
YoY Change
Pretax Income	$62.90M	$49.00M	$44.40M
YoY Change	58.44%	10.36%	-5.82%
Income Tax	$14.80M	$10.90M	$9.600M
% Of Pretax Income	23.53%	22.24%	21.62%
Net Earnings	$48.10M	$38.00M	$34.80M
YoY Change	56.68%	9.2%	16.46%
Net Earnings / Revenue	1.55%	1.22%	1.2%
Basic Earnings Per Share	$2.57	$2.04	$1.74
Diluted Earnings Per Share	$2.57	$2.04	$1.74
COMMON SHARES
Basic Shares Outstanding	18.62M shares	17.96M shares	19.25M shares
Diluted Shares Outstanding		17.98M shares	19.26M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$23.80M	$41.00M	$32.00M
YoY Change	49.69%	28.13%	-52.17%
Cash & Equivalents	$23.80M	$41.00M	$32.03M
Short-Term Investments
Other Short-Term Assets	$15.50M	$74.40M	$78.00M
YoY Change	-41.29%	-4.62%	104.72%
Inventory	$1.902B	$1.793B	$1.734B
Prepaid Expenses	$96.40M
Receivables	$225.1M	$222.2M	$169.3M
Other Receivables	$253.8M	$256.2M	$235.6M
Total Short-Term Assets	$2.516B	$2.387B	$2.249B
YoY Change	4.74%	6.13%	0.72%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.547B	$1.485B	$1.351B
YoY Change	14.79%	9.91%	6.42%
Goodwill	$994.5M	$979.0M	$968.8M
YoY Change	3.17%	1.06%	5.97%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$24.80M	$21.10M	$36.18M
YoY Change	-9.16%	-41.67%	75.62%
Total Long-Term Assets	$3.054B	$2.943B	$2.632B
YoY Change	17.52%	11.79%	5.36%
TOTAL ASSETS
Total Short-Term Assets	$2.516B	$2.387B	$2.249B
Total Long-Term Assets	$3.054B	$2.943B	$2.632B
Total Assets	$5.570B	$5.329B	$4.881B
YoY Change	11.38%	9.18%	3.17%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$527.5M	$483.3M	$428.4M
YoY Change	25.77%	12.8%	-1.93%
Accrued Expenses	$206.7M	$213.8M	$207.1M
YoY Change	4.61%	3.24%	-0.81%
Deferred Revenue
YoY Change
Short-Term Debt	$1.657B	$1.670B	$1.480B
YoY Change	-1.67%	12.84%	3763.97%
Long-Term Debt Due	$6.600M	$6.400M	$75.00M
YoY Change	-92.21%	-91.47%	75.64%
Total Short-Term Liabilities	$2.422B	$2.397B	$2.191B
YoY Change	1.5%	9.43%	2.55%
LONG-TERM LIABILITIES
Long-Term Debt	$1.432B	$1.308B	$1.304B
YoY Change	11.75%	0.3%	0.88%
Other Long-Term Liabilities	$99.20M	$110.5M	$99.46M
YoY Change	-3.31%	11.1%	6.4%
Total Long-Term Liabilities	$99.20M	$110.5M	$99.46M
YoY Change	-3.31%	11.1%	6.4%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.422B	$2.397B	$2.191B
Total Long-Term Liabilities	$99.20M	$110.5M	$99.46M
Total Liabilities	$2.522B	$2.508B	$2.290B
YoY Change	1.3%	9.51%	2.71%
SHAREHOLDERS EQUITY
Retained Earnings	$1.542B	$1.500B	$1.369B
YoY Change	10.58%	9.56%	19.97%
Common Stock	$295.6M	$292.2M	$290.9M
YoY Change	0.85%	0.44%	0.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$435.3M	$436.2M	$382.6M
YoY Change	-4.2%	14.0%	30.71%
Treasury Stock Shares	6.859M shares	6.885M shares	5.913M shares
Shareholders Equity	$1.256B	$1.186B	$1.148B
YoY Change
Total Liabilities & Shareholders Equity	$5.570B	$5.329B	$4.881B
YoY Change	11.38%	9.18%	3.17%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$48.10M	$38.00M	$34.80M
YoY Change	56.68%	9.2%	16.46%
Depreciation, Depletion And Amortization	$18.60M	$18.20M	$16.90M
YoY Change	8.77%	7.69%	12.23%
Cash From Operating Activities	$60.00M	$57.90M	$94.30M
YoY Change	-168.65%	-38.6%	-63.02%
INVESTING ACTIVITIES
Capital Expenditures	-$52.30M	-$30.30M	-$30.00M
YoY Change	129.39%	1.0%	-61.04%
Acquisitions
YoY Change
Other Investing Activities	-$45.80M	-$91.60M	-$27.70M
YoY Change	-15366.67%	230.69%	-44.49%
Cash From Investing Activities	-$98.10M	-$121.9M	-$57.70M
YoY Change	336.0%	111.27%	-54.53%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	23.10M	67.70M	-45.70M
YoY Change	-75.61%	-248.14%	-48.48%
NET CHANGE
Cash From Operating Activities	60.00M	57.90M	94.30M
Cash From Investing Activities	-98.10M	-121.9M	-57.70M
Cash From Financing Activities	23.10M	67.70M	-45.70M
Net Change In Cash	-15.00M	3.700M	-9.100M
YoY Change	-1.32%	-140.66%	-123.1%
FREE CASH FLOW
Cash From Operating Activities	$60.00M	$57.90M	$94.30M
Capital Expenditures	-$52.30M	-$30.30M	-$30.00M
Free Cash Flow	$112.3M	$88.20M	$124.3M
YoY Change	-273.84%	-29.04%	-62.56%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001031203
CY2018Q4	gpi	Fmcc Offset FMCCOffset	100000	USD
CY2019Q3	gpi	Fmcc Offset FMCCOffset	200000	USD
	dei	Trading Symbol TradingSymbol	GPI
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2018Q4	gpi	Floorplan Offset FloorplanOffset	33600000	USD
CY2019Q3	gpi	Floorplan Offset FloorplanOffset	25000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	347300000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	380500000	USD
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.26
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.78
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25494328	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25504131	shares
CY2018Q3	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-1700000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-6000000	USD
	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	800000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	4400000	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	7171661	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	6885019	shares
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-13461
	dei	Entity Registrant Name EntityRegistrantName	Group 1 Automotive, Inc
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	76-0506313
	dei	Entity Address Address Line1 EntityAddressAddressLine1	800 Gessner,
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 500
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77024
	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
	dei	City Area Code CityAreaCode	713
	dei	Local Phone Number LocalPhoneNumber	647-5700
	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15900000	USD
CY2019Q3	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	256200000	USD
CY2018Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	265700000	USD
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CY2019Q3	us-gaap	Inventory Net InventoryNet	1792700000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	1844100000	USD
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CY2018Q4	us-gaap	Assets Current AssetsCurrent	2402400000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1484800000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1347800000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	204700000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	979000000.0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
CY2019Q3	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	252900000	USD
CY2018Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	259600000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	21100000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	27400000	USD
CY2019Q3	us-gaap	Assets Assets	5329000000.0	USD
CY2018Q4	us-gaap	Assets Assets	5001100000	USD
CY2019Q3	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1199800000	USD
CY2018Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1258900000	USD
CY2019Q3	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	410500000	USD
CY2018Q4	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	417800000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	66000000.0	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	93000000.0	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23900000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	483300000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	419400000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	300000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	292800000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	213800000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	197600000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	2397300000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	291900000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1499800000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1394800000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-169500000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-137800000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	27400000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2386700000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1308000000.0	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281400000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	195500000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	131400000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	134700000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	110500000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	102600000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	300000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	436200000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	454400000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1186300000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5329000000.0	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5001100000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3118300000	USD
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	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8932400000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8692500000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2652700000	USD
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	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7581000000.0	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7399500000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	465600000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	435100000	USD
	us-gaap	Gross Profit GrossProfit	1351400000	USD
	us-gaap	Gross Profit GrossProfit	1293000000.0	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	354000000.0	USD
CY2018Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	316800000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1020400000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	949200000	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18000000.0	USD
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	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	53000000.0	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	50000000.0	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10300000	USD
CY2018Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	23200000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10800000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	83300000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	78200000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	267200000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	266400000	USD
CY2019Q3	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	15400000	USD
CY2018Q3	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	14700000	USD
	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	47000000.0	USD
	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	43300000	USD
CY2019Q3	us-gaap	Interest Expense Other InterestExpenseOther	18900000	USD
CY2018Q3	us-gaap	Interest Expense Other InterestExpenseOther	19100000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	55800000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	57400000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	49000000.0	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44400000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	164400000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165700000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11000000.0	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9600000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38500000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38600000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.04
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	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.78
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.18
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18000000.0	shares
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	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17900000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19900000	shares
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
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	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.77
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.18
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18000000.0	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19300000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17900000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19900000	shares
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-11600000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-400000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-800000	USD
	gpi	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	21300000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5500000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-5900000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-12000000.0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-22200000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-5600000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2700000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-19200000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	14000000.0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-5400000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3500000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-19700000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	16700000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000.0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2400000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31700000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	21000000.0	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32400000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	94200000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121600000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	1164200000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17000000.0	USD
CY2019Q3	gpi	Stock Issued During Period Value Employee Stock Purchase Plans Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlansNet	1900000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4400000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5200000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1186300000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31700000	USD
	gpi	Stock Issued During Period Value Employee Stock Purchase Plans Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlansNet	2900000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14400000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14800000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1186300000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	1172700000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2300000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-57300000	USD
CY2018Q3	gpi	Stock Issued During Period Value Employee Stock Purchase Plans Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlansNet	1400000	USD
	gpi	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	0	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	310800000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4300000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5200000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	1148400000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1124300000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5500000	USD
	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-108600000	USD
	gpi	Stock Issued During Period Value Employee Stock Purchase Plans Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlansNet	1500000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14200000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16000000.0	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	1148400000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	53000000.0	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	50000000.0	USD
	gpi	Operating Lease Rightof Use Asset Amortization OperatingLeaseRightofUseAssetAmortization	21200000	USD
	gpi	Operating Lease Rightof Use Asset Amortization OperatingLeaseRightofUseAssetAmortization	0	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3600000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4100000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10800000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	27400000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	14400000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	14200000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3100000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2500000	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5900000	USD
	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	27000000.0	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-700000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-600000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	99100000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	35500000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	31600000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-28400000	USD
	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	-41700000	USD
	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	-33700000	USD
	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-8100000	USD
	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-70200000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	10500000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	22400000	USD
	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	1100000	USD
	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	-13900000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	357400000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	97000000.0	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	135300000	USD
	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	43100000	USD
	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	107700000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	139500000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	118300000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	100000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-400000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-193500000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-145500000	USD
	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	5311200000	USD
	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	5106800000	USD
	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	5364300000	USD
	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	5185200000	USD
	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	230500000	USD
	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	98600000	USD
	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	211400000	USD
	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	91400000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3200000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	130800000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	123300000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	133700000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	105600000	USD
	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	74800000	USD
	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	54700000	USD
	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	112800000	USD
	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	83200000	USD
	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	2800000	USD
	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	1500000	USD
	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	0	USD
	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	900000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	108600000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14800000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16000000.0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-90100000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-204200000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1300000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2900000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	25900000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	4800000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	29600000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	44600000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	34400000	USD
CY2019Q3	gpi	Numberofinternationalregions Numberofinternationalregions	2	international_region
	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-bottom:8px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from these estimates. Significant estimates made in the accompanying Condensed Consolidated Financial Statements include, but are not limited to, inventory market adjustments, reserves for chargebacks against revenue recognized from the sale of finance and insurance products, reserves for self-insurance programs, certain assumptions related to goodwill and intangible franchise rights and reserves for potential legal or similar proceedings related to the Company’s business.</span></div>
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3118300000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8932400000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2889100000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8692500000	USD
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	97000000.0	USD
	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	140400000	USD
CY2018Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents	5100000	USD
	gpi	Numberof Dealerships Disposed NumberofDealershipsDisposed	1	dealership
	gpi	Number Of Franchises Disposed NumberOfFranchisesDisposed	1	franchise
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	5000000.0	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	24400000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17961555	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19252948	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17889572	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19858643	shares
CY2019Q3	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	17145	shares
CY2018Q3	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	8122	shares
	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	17978	shares
	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	8876	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17978700	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19261070	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17907550	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19867519	shares
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1400000	USD
CY2018Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1200000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	4700000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	4300000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36600000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	33600000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	121200000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	122800000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.04
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.74
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.78
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.18
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1400000	USD
CY2018Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1200000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	4700000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	4300000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	36600000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	33600000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	121200000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	122800000	USD
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.77
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.18
CY2019Q3	gpi	Inventory Value Financing Percentage Maximum InventoryValueFinancingPercentageMaximum	0.85
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	41000000.0	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15900000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3600000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2800000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	44600000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5600000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	6100000	USD
	us-gaap	Interest Paid Net InterestPaidNet	83100000	USD
	us-gaap	Interest Paid Net InterestPaidNet	84400000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	34800000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	31000000.0	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	66100000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	48600000	USD
CY2019Q3	us-gaap	Other Long Term Debt OtherLongTermDebt	34200000	USD
CY2018Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	33600000	USD
CY2019Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1376400000	USD
CY2018Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1377300000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2400000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2900000	USD
CY2019Q3	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	66000000.0	USD
CY2018Q4	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	93000000.0	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1308000000.0	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281400000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3600000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2800000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2019Q3	gpi	Increase Decrease In Floor Plan Interest Expense Due To Interest Rate Hedges IncreaseDecreaseInFloorPlanInterestExpenseDueToInterestRateHedges	-100000	USD
CY2018Q3	gpi	Increase Decrease In Floor Plan Interest Expense Due To Interest Rate Hedges IncreaseDecreaseInFloorPlanInterestExpenseDueToInterestRateHedges	1100000	USD
	gpi	Increase Decrease In Floor Plan Interest Expense Due To Interest Rate Hedges IncreaseDecreaseInFloorPlanInterestExpenseDueToInterestRateHedges	-700000	USD
	gpi	Increase Decrease In Floor Plan Interest Expense Due To Interest Rate Hedges IncreaseDecreaseInFloorPlanInterestExpenseDueToInterestRateHedges	4500000	USD
CY2019Q3	gpi	Maximum Notional Amount Of Derivatives In Effect At Any Time MaximumNotionalAmountOfDerivativesInEffectAtAnyTime	896900000	USD
CY2019Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	0	USD
CY2018Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	400000	USD
CY2019Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	300000	USD
CY2018Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	13100000	USD
CY2019Q3	us-gaap	Derivative Assets DerivativeAssets	300000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	13500000	USD
CY2019Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	500000	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	100000	USD
CY2019Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	13900000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	1700000	USD
CY2019Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	14400000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1800000	USD
CY2019Q3	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	10800000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	15900000	USD
CY2019Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	500000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-19200000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	14000000.0	USD
CY2019Q3	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	204700000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	59000000.0	USD
CY2019Q3	gpi	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	263700000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23900000	USD
CY2019Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6400000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	195500000	USD
CY2019Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	59700000	USD
CY2019Q3	gpi	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	285500000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	10000000.0	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	31100000	USD
CY2019Q3	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	600000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	1600000	USD
CY2019Q3	us-gaap	Sublease Income SubleaseIncome	400000	USD
	us-gaap	Sublease Income SubleaseIncome	1000000.0	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1700000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	4100000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1500000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	3500000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	14800000	USD
	us-gaap	Lease Cost LeaseCost	40700000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	6800000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	4600000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	38500000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	8500000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	36700000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	8500000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	32400000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	8400000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	29400000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	7200000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	170000000.0	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	65600000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	313800000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	102800000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	94400000	USD
CY2019Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	36700000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	219400000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	66100000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y6M
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P14Y7M6D
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.059
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.078
	us-gaap	Operating Lease Payments OperatingLeasePayments	31100000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	3500000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2700000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	18200000	USD
	gpi	Rightof Use Asset Obtainedin Exchangefor Operating Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforOperatingLeaseLiabilityModificationsandRemeasurements	-9500000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	14000000.0	USD
	gpi	Rightof Use Asset Obtainedin Exchangefor Finance Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityModificationsandRemeasurements	8200000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	20600000	USD
	gpi	Goodwill Written Off Related To Sale Of Business Unit And Purchase Accounting Adjustments GoodwillWrittenOffRelatedToSaleOfBusinessUnitAndPurchaseAccountingAdjustments	1600000	USD
	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-3900000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	979000000.0	USD
CY2019Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	97800000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q3	us-gaap	Indefinitelived Intangible Assets Acquired IndefinitelivedIntangibleAssetsAcquired	3100000	USD
	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-37200000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-6000000.0	USD
	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	200000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31700000	USD
	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-3800000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	4400000	USD
	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-900000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5500000	USD
	gpi	Other Comprehensive Income Loss Tax Effects Reclassified From Aoci OtherComprehensiveIncomeLossTaxEffectsReclassifiedFromAOCI	100000	USD
CY2019Q3	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3118300000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8932400000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	49000000.0	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	164400000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2889100000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8692500000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44400000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165700000	USD
CY2019Q3	us-gaap	Loss From Catastrophes LossFromCatastrophes	11900000	USD
	us-gaap	Loss From Catastrophes LossFromCatastrophes	17800000	USD
	us-gaap	Loss From Catastrophes LossFromCatastrophes	5800000	USD
CY2019Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	224700000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	197200000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2500000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3200000	USD
CY2019Q3	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	222200000	USD
CY2018Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	194000000.0	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	300000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	300000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	41000000.0	USD
CY2019Q3	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	256200000	USD
CY2019Q3	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	222200000	USD
CY2019Q3	gpi	Intercompanyaccountsreceivablecurrent Intercompanyaccountsreceivablecurrent	0	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	1792700000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	74400000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	2386500000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1484800000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	204700000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	979000000.0	USD
CY2019Q3	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	252900000	USD
CY2019Q3	gpi	Investmentin Subsidiaries InvestmentinSubsidiaries	0	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	21100000	USD
CY2019Q3	us-gaap	Assets Assets	5329000000.0	USD
CY2019Q3	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1199800000	USD
CY2019Q3	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	410500000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	66000000.0	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23900000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	483300000	USD
CY2019Q3	gpi	Intercompanyaccountspayablecurrent Intercompanyaccountspayablecurrent	0	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	213800000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	2397300000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1308000000.0	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	195500000	USD
CY2019Q3	us-gaap	Deferred Income Taxes And Other Liabilities Noncurrent DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent	241900000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1186300000	USD
CY2019Q3	gpi	Intercompanynotereceivable Intercompanynotereceivable	0	USD
CY2019Q3	gpi	Stockholders Equity Attributableto Parent Excluding Intercompany Receivables StockholdersEquityAttributabletoParentExcludingIntercompanyReceivables	1186300000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5329000000.0	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15900000	USD
CY2018Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	265700000	USD
CY2018Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	194000000.0	USD
CY2018Q4	gpi	Intercompanyaccountsreceivablecurrent Intercompanyaccountsreceivablecurrent	0	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	1844100000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	82700000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	2402400000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1347800000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
CY2018Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	259600000	USD
CY2018Q4	gpi	Investmentin Subsidiaries InvestmentinSubsidiaries	0	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	27400000	USD
CY2018Q4	us-gaap	Assets Assets	5001100000	USD
CY2018Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1258900000	USD
CY2018Q4	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	417800000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	93000000.0	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	419400000	USD
CY2018Q4	gpi	Intercompanyaccountspayablecurrent Intercompanyaccountspayablecurrent	0	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	197600000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2386700000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281400000	USD
CY2018Q4	us-gaap	Deferred Income Taxes And Other Liabilities Noncurrent DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent	237300000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
CY2018Q4	gpi	Intercompanynotereceivable Intercompanynotereceivable	0	USD
CY2018Q4	gpi	Stockholders Equity Attributableto Parent Excluding Intercompany Receivables StockholdersEquityAttributabletoParentExcludingIntercompanyReceivables	1095700000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5001100000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3118300000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2652700000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	465600000	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	354000000.0	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18000000.0	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10300000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	83300000	USD
CY2019Q3	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	15400000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	49000000.0	USD
CY2019Q3	us-gaap	Interest Expense Other InterestExpenseOther	18900000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11000000.0	USD
CY2019Q3	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17000000.0	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	21000000.0	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8932400000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7581000000.0	USD
	us-gaap	Gross Profit GrossProfit	1351400000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1020400000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	53000000.0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10800000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	267200000	USD
	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	47000000.0	USD
	us-gaap	Interest Expense Other InterestExpenseOther	55800000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	164400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38500000	USD
	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	125900000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31700000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	94200000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2889100000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2454000000.0	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	435100000	USD
CY2018Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	316800000	USD
CY2018Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16900000	USD
CY2018Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	23200000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	78200000	USD
CY2018Q3	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	14700000	USD
CY2018Q3	us-gaap	Interest Expense Other InterestExpenseOther	19100000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44400000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9600000	USD
CY2018Q3	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2400000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32400000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8692500000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7399500000	USD
	us-gaap	Gross Profit GrossProfit	1293000000.0	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	949200000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	50000000.0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	27400000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	266400000	USD
	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	43300000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	57400000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165700000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38600000	USD
	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
	us-gaap	Net Income Loss NetIncomeLoss	127100000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5500000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121600000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	310800000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	97000000.0	USD
	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	43100000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	139500000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	100000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-193500000	USD
	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	5311200000	USD
	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	5364300000	USD
	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	230500000	USD
	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	211400000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3200000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	130800000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	133700000	USD
	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	74800000	USD
	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	112800000	USD
	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	2800000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14800000	USD
	gpi	Borrowingsrepaymentswithsubsidiaries Borrowingsrepaymentswithsubsidiaries	0	USD
	gpi	Changeininvestmentinsubsidiaries Changeininvestmentinsubsidiaries	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-90100000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1300000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	25900000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	44600000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	357400000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	135300000	USD
	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	107700000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	118300000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-400000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-145500000	USD
	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	5106800000	USD
	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	5185200000	USD
	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	98600000	USD
	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	91400000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	123300000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	105600000	USD
	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	54700000	USD
	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	83200000	USD
	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	1500000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	108600000	USD
	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	900000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	16000000.0	USD
	gpi	Borrowingsrepaymentswithsubsidiaries Borrowingsrepaymentswithsubsidiaries	0	USD
	gpi	Changeininvestmentinsubsidiaries Changeininvestmentinsubsidiaries	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-204200000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2900000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	4800000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	29600000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	34400000	USD

Files In Submission

Name	View Source	Status
0001031203-19-000029-index-headers.html	Edgar Link	pending
0001031203-19-000029-index.html	Edgar Link	pending
0001031203-19-000029.txt	Edgar Link	pending
0001031203-19-000029-xbrl.zip	Edgar Link	pending
a2019q3exhibit311.htm	Edgar Link	pending
a2019q3exhibit312.htm	Edgar Link	pending
a2019q3exhibit321.htm	Edgar Link	pending
a2019q3exhibit322.htm	Edgar Link	pending
a2019q3form10-q.htm	Edgar Link	pending
a2019q3form10-q_htm.xml	Edgar Link	completed
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gpi-20190930.xsd	Edgar Link	pending
gpi-20190930_cal.xml	Edgar Link	unprocessable
gpi-20190930_def.xml	Edgar Link	unprocessable
gpi-20190930_lab.xml	Edgar Link	unprocessable
gpi-20190930_pre.xml	Edgar Link	unprocessable
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$GPI
Group 1 Automotive Inc Stock $gpi

2019 Q4 Form 10-Q Financial Statement

#000103120319000029 Filed on October 30, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPI Group 1 Automotive Inc Stock $gpi

2019 Q4 Form 10-Q Financial Statement

#000103120319000029 Filed on October 30, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPI
Group 1 Automotive Inc Stock $gpi