$GPI
Group 1 Automotive Inc Stock $gpi

$gpi Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000103120320000006 Filed on February 13, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$3.111B	$2.909B	$2.889B
YoY Change	6.97%	-0.4%	-4.09%
Cost Of Revenue	$2.647B	$2.477B	$2.454B
YoY Change	6.87%	-0.72%	-4.92%
Gross Profit	$464.6M	$432.1M	$435.1M
YoY Change	7.52%	1.51%	0.85%
Gross Profit Margin	14.93%	14.85%	15.06%
Selling, General & Admin	$338.0M	$323.8M	$316.8M
YoY Change	4.39%	4.62%	-3.51%
% of Gross Profit	72.75%	74.94%	72.81%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.60M	$17.10M	$16.90M
YoY Change	8.77%	13.25%	12.23%
% of Gross Profit	4.0%	3.96%	3.88%
Operating Expenses	$356.7M	$341.0M	$316.8M
YoY Change	4.6%	5.02%	-3.51%
Operating Profit	$96.50M	$74.70M	$78.20M
YoY Change	29.18%	-26.02%	-0.39%
Interest Expense	-$33.70M	-$35.00M	-$33.80M
YoY Change	-3.71%	9.38%	7.64%
% of Operating Profit	-34.92%	-46.85%	-43.22%
Other Income/Expense, Net	$100.0K
YoY Change
Pretax Income	$62.90M	$39.70M	$44.40M
YoY Change	58.44%	-32.71%	-5.82%
Income Tax	$14.80M	$8.800M	$9.600M
% Of Pretax Income	23.53%	22.17%	21.62%
Net Earnings	$48.10M	$30.70M	$34.80M
YoY Change	56.68%	-72.21%	16.46%
Net Earnings / Revenue	1.55%	1.06%	1.2%
Basic Earnings Per Share	$2.57	$1.62	$1.74
Diluted Earnings Per Share	$2.57	$1.62	$1.74
COMMON SHARES
Basic Shares Outstanding	18.62M shares	19.17M shares	19.25M shares
Diluted Shares Outstanding			19.26M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$23.80M	$15.90M	$32.00M
YoY Change	49.69%	-44.79%	-52.17%
Cash & Equivalents	$23.80M	$15.90M	$32.03M
Short-Term Investments
Other Short-Term Assets	$15.50M	$26.40M	$78.00M
YoY Change	-41.29%	-37.29%	104.72%
Inventory	$1.902B	$1.844B	$1.734B
Prepaid Expenses	$96.40M	$56.30M
Receivables	$225.1M	$194.0M	$169.3M
Other Receivables	$253.8M	$265.6M	$235.6M
Total Short-Term Assets	$2.516B	$2.402B	$2.249B
YoY Change	4.74%	3.14%	0.72%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.547B	$1.348B	$1.351B
YoY Change	14.79%	2.19%	6.42%
Goodwill	$994.5M	$963.9M	$968.8M
YoY Change	3.17%	5.58%	5.97%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$24.80M	$27.30M	$36.18M
YoY Change	-9.16%	12.56%	75.62%
Total Long-Term Assets	$3.054B	$2.599B	$2.632B
YoY Change	17.52%	2.24%	5.36%
TOTAL ASSETS
Total Short-Term Assets	$2.516B	$2.402B	$2.249B
Total Long-Term Assets	$3.054B	$2.599B	$2.632B
Total Assets	$5.570B	$5.001B	$4.881B
YoY Change	11.38%	2.67%	3.17%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$527.5M	$419.4M	$428.4M
YoY Change	25.77%	1.55%	-1.93%
Accrued Expenses	$206.7M	$197.6M	$207.1M
YoY Change	4.61%	11.59%	-0.81%
Deferred Revenue
YoY Change
Short-Term Debt	$1.657B	$1.685B	$1.480B
YoY Change	-1.67%	7.53%	3763.97%
Long-Term Debt Due	$6.600M	$84.70M	$75.00M
YoY Change	-92.21%	114.43%	75.64%
Total Short-Term Liabilities	$2.422B	$2.387B	$2.191B
YoY Change	1.5%	8.56%	2.55%
LONG-TERM LIABILITIES
Long-Term Debt	$1.432B	$1.282B	$1.304B
YoY Change	11.75%	-2.78%	0.88%
Other Long-Term Liabilities	$99.20M	$102.6M	$99.46M
YoY Change	-3.31%	5.64%	6.4%
Total Long-Term Liabilities	$99.20M	$102.6M	$99.46M
YoY Change	-3.31%	5.64%	6.4%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.422B	$2.387B	$2.191B
Total Long-Term Liabilities	$99.20M	$102.6M	$99.46M
Total Liabilities	$2.522B	$2.489B	$2.290B
YoY Change	1.3%	8.43%	2.71%
SHAREHOLDERS EQUITY
Retained Earnings	$1.542B	$1.395B	$1.369B
YoY Change	10.58%	11.91%	19.97%
Common Stock	$295.6M	$293.1M	$290.9M
YoY Change	0.85%	0.47%	0.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$435.3M	$454.4M	$382.6M
YoY Change	-4.2%	56.4%	30.71%
Treasury Stock Shares	6.859M shares	7.172M shares	5.913M shares
Shareholders Equity	$1.256B	$1.096B	$1.148B
YoY Change
Total Liabilities & Shareholders Equity	$5.570B	$5.001B	$4.881B
YoY Change	11.38%	2.67%	3.17%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$48.10M	$30.70M	$34.80M
YoY Change	56.68%	-72.21%	16.46%
Depreciation, Depletion And Amortization	$18.60M	$17.10M	$16.90M
YoY Change	8.77%	13.25%	12.23%
Cash From Operating Activities	$60.00M	-$87.40M	$94.30M
YoY Change	-168.65%	-21.05%	-63.02%
INVESTING ACTIVITIES
Capital Expenditures	-$52.30M	-$22.80M	-$30.00M
YoY Change	129.39%	-68.11%	-61.04%
Acquisitions
YoY Change
Other Investing Activities	-$45.80M	$300.0K	-$27.70M
YoY Change	-15366.67%	-94.64%	-44.49%
Cash From Investing Activities	-$98.10M	-$22.50M	-$57.70M
YoY Change	336.0%	-65.86%	-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	94.70M	-45.70M
YoY Change	-75.61%	-32.16%	-48.48%
NET CHANGE
Cash From Operating Activities	60.00M	-87.40M	94.30M
Cash From Investing Activities	-98.10M	-22.50M	-57.70M
Cash From Financing Activities	23.10M	94.70M	-45.70M
Net Change In Cash	-15.00M	-15.20M	-9.100M
YoY Change	-1.32%	-58.92%	-123.1%
FREE CASH FLOW
Cash From Operating Activities	$60.00M	-$87.40M	$94.30M
Capital Expenditures	-$52.30M	-$22.80M	-$30.00M
Free Cash Flow	$112.3M	-$64.60M	$124.3M
YoY Change	-273.84%	64.8%	-62.56%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001031203
CY2018Q4	gpi	Fmcc Offset FMCCOffset	100000	USD
CY2019Q4	gpi	Fmcc Offset FMCCOffset	4100000	USD
CY2018Q4	gpi	Floorplan Offset FloorplanOffset	33600000	USD
CY2019Q4	gpi	Floorplan Offset FloorplanOffset	106800000	USD
CY2019Q4	gpi	Numberofinternationalregions Numberofinternationalregions	2	international_region
CY2018	us-gaap	Advertising Expense AdvertisingExpense	75200000	USD
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.97
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.04
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.09
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25494328	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25486711	shares
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	97800000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	97800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-4100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2018Q4	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	600000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2100000	USD
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	7171661	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6858503	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-13461
CY2019	dei	Entity Registrant Name EntityRegistrantName	Group 1 Automotive, Inc
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	76-0506313
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	800 Gessner,
CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 500
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77024
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston,
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2019	dei	City Area Code CityAreaCode	713
CY2019	dei	Local Phone Number LocalPhoneNumber	647-5700
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2018Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	194000000.0	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	1901700000	USD
CY2019Q2	dei	Entity Public Float EntityPublicFloat	1400000000	USD
CY2019	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
CY2019	dei	Trading Symbol TradingSymbol	GPI
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	18374353	shares
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	23800000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15900000	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	253800000	USD
CY2018Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	265700000	USD
CY2019Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	225100000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	1844100000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	96400000	USD
CY2018Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	56300000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	15500000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	26400000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	2516300000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	2402400000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1547100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1347800000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1008300000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
CY2019Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	253500000	USD
CY2018Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	259600000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	24800000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	27300000	USD
CY2019Q4	us-gaap	Assets Assets	5570200000	USD
CY2018Q4	us-gaap	Assets Assets	5001100000	USD
CY2019Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1144400000	USD
CY2018Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1258800000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	24600000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	527500000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	459900000	USD
CY2018Q4	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	417800000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	59100000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	93000000.0	USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	300000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	419400000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	206700000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	197600000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2422300000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2386600000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1432100000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	210700000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	145700000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	134700000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	103600000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	102600000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	300000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	295300000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	292800000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1542400000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1394800000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147000000.0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-137800000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	435300000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	454400000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1255700000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5570200000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5001100000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11123700000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	10227800000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9876300000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9478200000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1816000000.0	USD
CY2018	us-gaap	Gross Profit GrossProfit	1725100000	USD
CY2017	us-gaap	Gross Profit GrossProfit	1645500000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1358400000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1273100000	USD
CY2018	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	59900000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1226200000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	57900000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	22200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	43900000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	19500000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	363700000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	341100000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	341900000	USD
CY2019	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	61600000	USD
CY2017	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	52400000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	74900000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	75800000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	70500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	219000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.35
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.83
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	10.08
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17900000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19500000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	20400000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.83
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.08
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17900000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19500000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20400000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-24200000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	15100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13300000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	6500000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-13000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9800000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	8700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-14400000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	23700000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	164800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	143400000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	237200000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	930200000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	23700000	USD
CY2017	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-42100000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	600000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18900000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20400000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1124300000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14400000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2018	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-183900000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2700000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18700000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20800000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9200000	USD
CY2019	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-1400000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	4200000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18800000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20300000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1255700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	57900000	USD
CY2019	gpi	Operating Lease Rightof Use Asset Amortization OperatingLeaseRightofUseAssetAmortization	28200000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16200000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3500000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-46100000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	22200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	43900000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	19500000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	18800000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18700000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	18900000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	4000000.0	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3400000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3700000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5900000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	26800000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	800000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1100000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-900000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	400000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	123100000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	18400000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	35600000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	32500000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-2900000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	10700000	USD
CY2019	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	28800000	USD
CY2018	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	80600000	USD
CY2017	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	44000000.0	USD
CY2019	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-12700000	USD
CY2018	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-39500000	USD
CY2017	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	33500000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	44000000.0	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	16300000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	9300000	USD
CY2019	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	-38900000	USD
CY2018	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	-38400000	USD
CY2017	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	8300000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-500000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-800000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	500000	USD
CY2019	gpi	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	28300000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	370900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	270000000.0	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	196500000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	143200000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	135300000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	109100000	USD
CY2019	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	43400000	USD
CY2018	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	107900000	USD
CY2017	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	10700000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	191800000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	141000000.0	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	215800000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-500000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1600000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-291600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-168000000.0	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-312600000	USD
CY2019	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	7304600000	USD
CY2018	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	6954300000	USD
CY2017	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	7019100000	USD
CY2019	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	7423200000	USD
CY2018	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	6870100000	USD
CY2017	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	6957900000	USD
CY2019	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	319000000.0	USD
CY2018	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	165300000	USD
CY2017	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	68100000	USD
CY2019	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	281400000	USD
CY2018	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	158500000	USD
CY2017	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	42300000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5400000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	177400000	USD
CY2018	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	156000000.0	USD
CY2017	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	165700000	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	166700000	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	118800000	USD
CY2017	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	121200000	USD
CY2019	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	173500000	USD
CY2018	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	54700000	USD
CY2017	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	75300000	USD
CY2019	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	147300000	USD
CY2018	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	91500000	USD
CY2017	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	29400000	USD
CY2019	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	8600000	USD
CY2018	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	7600000	USD
CY2017	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	7100000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4400000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4900000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2500000	USD
CY2019	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	0	USD
CY2018	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	900000	USD
CY2017	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1400000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	183900000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	40100000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20300000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20900000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20500000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109500000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	121500000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2900000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3300000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	0	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	9300000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-10900000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5400000	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
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24200000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	28100000	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
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:8px;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-top:8px;text-indent:32px;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. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and other assumptions that are believed to be reasonable under the circumstances; however, actual results could differ materially from such estimates. The significant estimates made by management in the accompanying Consolidated Financial Statements relate to inventory valuation adjustments, reserves for future chargebacks on finance, insurance and vehicle service contract fees, self-insured property and casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights, and reserves for potential litigation.</span></div>
CY2019	us-gaap	Loss From Catastrophes LossFromCatastrophes	16000000.0	USD
CY2018	us-gaap	Loss From Catastrophes LossFromCatastrophes	6100000	USD
CY2017	us-gaap	Loss From Catastrophes LossFromCatastrophes	5000000.0	USD
CY2019	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	1800000	USD
CY2018	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	5100000	USD
CY2017	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	200000	USD
CY2019	gpi	Number Of Geographic Regions NumberOfGeographicRegions	3	geographic_region
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	19000000.0	USD
CY2018	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	38700000	USD
CY2017	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	19300000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	75200000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	74100000	USD
CY2019	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	15400000	USD
CY2018	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	14800000	USD
CY2017	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	15300000	USD
CY2019	gpi	Value Of Used Vehicle Inventory Financed ValueOfUsedVehicleInventoryFinanced	0.85
CY2019Q4	gpi	General Liability And Workers Compensation Liability GeneralLiabilityAndWorkersCompensationLiability	24400000	USD
CY2018Q4	gpi	General Liability And Workers Compensation Liability GeneralLiabilityAndWorkersCompensationLiability	24000000.0	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11123700000	USD
CY2019	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	19500000	USD
CY2018	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	18700000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	49700000	USD
CY2018Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	46400000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	14600000	USD
CY2019	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	19500000	USD
CY2019	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	12500000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	21600000	USD
CY2019	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	143200000	USD
CY2018	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	140400000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	5100000	USD
CY2017	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	120300000	USD
CY2017	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	11200000	USD
CY2019	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	5000000.0	USD
CY2018	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	24400000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	681800	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	71.60
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	257199	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	65.92
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	225753	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	69.87
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	39040	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	68.72
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	674206	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	70.19
CY2019	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	8600000	USD
CY2018	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	7600000	USD
CY2017	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	7100000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19900000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18700000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18900000	USD
CY2019	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	3500000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19452560	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	20419858	shares
CY2019	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	18879	shares
CY2018	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	8492	shares
CY2017	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	5041	shares
CY2018	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	3400000	USD
CY2017	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	5400000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	33400000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y3M18D
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17917195	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17936074	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19461052	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20424899	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	6400000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	5400000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	7500000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	167600000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	152400000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	205900000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.35
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.83
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	10.08
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6400000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	5400000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	7500000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	167600000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	152400000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	205900000	USD
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.83
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.08
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	4300000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2800000	USD
CY2019Q4	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2019Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	0	USD
CY2018Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	400000	USD
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	1900000	USD
CY2018Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	13100000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	1900000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	13500000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2800000	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	100000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	4400000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	1700000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7200000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1800000	USD
CY2019Q4	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	-4100000	USD
CY2018Q4	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	8900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13300000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	6500000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1000000.0	USD
CY2019Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	2800000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	227900000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	197200000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2800000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3200000	USD
CY2019Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	225100000	USD
CY2018Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	194000000.0	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	253800000	USD
CY2018Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	265700000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	300000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	300000	USD
CY2019Q4	gpi	New Vehicles Inventory Gross NewVehiclesInventoryGross	1328600000	USD
CY2018Q4	gpi	New Vehicles Inventory Gross NewVehiclesInventoryGross	1274300000	USD
CY2019Q4	gpi	Used Vehicles Inventory Gross UsedVehiclesInventoryGross	346700000	USD
CY2018Q4	gpi	Used Vehicles Inventory Gross UsedVehiclesInventoryGross	347400000	USD
CY2019Q4	gpi	Rental Vehicles Inventory Gross RentalVehiclesInventoryGross	140900000	USD
CY2018Q4	gpi	Rental Vehicles Inventory Gross RentalVehiclesInventoryGross	142900000	USD
CY2019Q4	gpi	Parts Accessoriesand Other Inventory Gross PartsAccessoriesandOtherInventoryGross	85500000	USD
CY2018Q4	gpi	Parts Accessoriesand Other Inventory Gross PartsAccessoriesandOtherInventoryGross	79400000	USD
CY2019Q4	us-gaap	Inventory Gross InventoryGross	1901700000	USD
CY2018Q4	us-gaap	Inventory Gross InventoryGross	1844100000	USD
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	9700000	USD
CY2018Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	8500000	USD
CY2019Q4	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Inventory Cost ManufacturerFloorplanAssistanceRecognizedAsReductionOfInventoryCost	10700000	USD
CY2018Q4	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Inventory Cost ManufacturerFloorplanAssistanceRecognizedAsReductionOfInventoryCost	9700000	USD
CY2019	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	49100000	USD
CY2018	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	47300000	USD
CY2017	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	48900000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1947300000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1695200000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	400200000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	347300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1547100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1347800000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	71600000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	67100000	USD
CY2017	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	57900000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1600000	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	75500000	USD
CY2019Q4	gpi	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	295500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	24600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	210700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	76300000	USD
CY2019Q4	gpi	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	318300000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	40100000	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2300000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	1500000	USD
CY2019	us-gaap	Lease Cost LeaseCost	52600000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	5500000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	37300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	12700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	38700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	9600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	34400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	9200000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	31400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	7700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	27100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	22400000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	169400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	62300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	338300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	123900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	103000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	40900000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	235400000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	83000000.0	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y9M18D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.061
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.072
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	41600000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	4800000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3800000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	34000000.0	USD
CY2019	gpi	Rightof Use Asset Obtainedin Exchangefor Operating Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforOperatingLeaseLiabilityModificationsandRemeasurements	-9100000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	29600000	USD
CY2019	gpi	Rightof Use Asset Obtainedin Exchangefor Finance Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityModificationsandRemeasurements	8200000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	259600000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	253500000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	913000000.0	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	72500000	USD
CY2018	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	13400000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-8200000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	43300000	USD
CY2019	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	1600000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1008300000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	97800000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	23600000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	25400000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	83000000.0	USD
CY2018Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	48600000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	42800000	USD
CY2018Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	33600000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1501700000	USD
CY2018Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1384800000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5600000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	7400000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	4800000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2900000	USD
CY2019Q4	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	59100000	USD
CY2018Q4	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	93000000.0	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1432100000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	58200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	75100000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	598700000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	374500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	152800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	242400000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1501700000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4300000	USD
CY2019Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	436200000	USD
CY2018Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	390300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	227900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	192100000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	206600000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-600000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	13300000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	12400000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	219000000.0	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	30900000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35900000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	44900000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	16500000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2600000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-46900000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3800000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-700000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.234
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.025
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5600000	USD
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.025
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	42800000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	41800000	USD
CY2019Q4	gpi	Deferred Tax Assets Interest Rate Swaps DeferredTaxAssetsInterestRateSwaps	1300000	USD
CY2018Q4	gpi	Deferred Tax Assets Interest Rate Swaps DeferredTaxAssetsInterestRateSwaps	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	38200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	17900000	USD
CY2019Q4	gpi	Deferredtaxassetsdepreciationexpense Deferredtaxassetsdepreciationexpense	0	USD
CY2018Q4	gpi	Deferredtaxassetsdepreciationexpense Deferredtaxassetsdepreciationexpense	400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	37600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	37600000	USD
CY2019Q4	gpi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	55500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1500000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	176900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	97800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	69700000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3800000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4000000.0	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	900000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3900000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2300000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3900000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2900000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4300000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-3000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5600000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	47700000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	43100000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	76700000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5200000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3600000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4500000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	900000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-300000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-2400000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1100000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1300000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	900000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1700000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	3400000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	600000	USD
CY2019	gpi	Deferredtaxeffecttaxcutjobactbenefit Deferredtaxeffecttaxcutjobactbenefit	0	USD
CY2018	gpi	Deferredtaxeffecttaxcutjobactbenefit Deferredtaxeffecttaxcutjobactbenefit	-600000	USD
CY2017	gpi	Deferredtaxeffecttaxcutjobactbenefit Deferredtaxeffecttaxcutjobactbenefit	-73000000.0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-100000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-100000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	700000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	400000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	800000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000.0	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	72300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	52300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	107200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	45600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	135100000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	123700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	68000000.0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	50200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	2800000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	45400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	248500000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	176700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	141300000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	131100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	4400000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	3600000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	145700000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	134700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	141300000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	131100000	USD
CY2019Q4	gpi	Numberofforeignsubsidiaries Numberofforeignsubsidiaries	2	subsidiary
CY2019Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	21900000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000.0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	600000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	100000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2400000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1400000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2018Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	61900000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	3300000	USD
CY2018Q4	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	800000	USD
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	6600000	USD
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	6200000	USD
CY2018Q4	gpi	Guarantor Obligations Maximum Exposure Inestimable Minimum Lease Payments Guaranteed GuarantorObligationsMaximumExposureInestimableMinimumLeasePaymentsGuaranteed	38600000	USD
CY2019Q4	gpi	Lettersof Credit Outstandingas Beneficiary LettersofCreditOutstandingasBeneficiary	7100000	USD
CY2019	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-13500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-4100000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9200000	USD
CY2018	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-15500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	2100000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-1200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14400000	USD
CY2018	gpi	Other Comprehensive Income Loss Tax Effects Reclassified From Aoci OtherComprehensiveIncomeLossTaxEffectsReclassifiedFromAOCI	200000	USD
CY2017	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	16700000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	600000	USD
CY2017	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-4600000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	23700000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	23800000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15900000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	4300000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2800000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	28100000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5200000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9200000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	125300000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	128600000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	117100000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	48300000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40800000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	61000000.0	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1816000000.0	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1358400000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2019	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	61600000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	74900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2019	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	92500000	USD
CY2019	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	99300000	USD
CY2019	gpi	Capital Expenditures CapitalExpenditures	191800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2018	us-gaap	Gross Profit GrossProfit	1725100000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1273100000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2018	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	59900000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	75800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2018	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	31400000	USD
CY2018	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	109600000	USD
CY2018	gpi	Capital Expenditures CapitalExpenditures	141000000.0	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11123700000	USD
CY2017	us-gaap	Gross Profit GrossProfit	1645500000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1226200000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	57900000	USD
CY2017	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	52400000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	70500000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	219000000.0	USD
CY2017	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	110400000	USD
CY2017	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	105400000	USD
CY2017	gpi	Capital Expenditures CapitalExpenditures	215800000	USD
CY2019	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	4100000	USD
CY2018	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	500000	USD
CY2017	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	7100000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1547100000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2019Q4	us-gaap	Assets Assets	5570200000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1347800000	USD
CY2018Q4	us-gaap	Assets Assets	5001100000	USD
CY2018Q4	gpi	Investmentin Subsidiaries InvestmentinSubsidiaries	0	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	23800000	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	253800000	USD
CY2019Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	225100000	USD
CY2019Q4	gpi	Intercompanyaccountsreceivablecurrent Intercompanyaccountsreceivablecurrent	0	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	1901700000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	111900000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	2516300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1547100000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1008300000	USD
CY2019Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	253500000	USD
CY2019Q4	gpi	Investmentin Subsidiaries InvestmentinSubsidiaries	0	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	24800000	USD
CY2019Q4	us-gaap	Assets Assets	5570200000	USD
CY2019Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1144400000	USD
CY2019Q4	gpi	Floorplan Notes Payable Manufacturer Affiliates FloorplanNotesPayableManufacturerAffiliates	459900000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	59100000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	24600000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	527500000	USD
CY2019Q4	gpi	Intercompanyaccountspayablecurrent Intercompanyaccountspayablecurrent	0	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	206700000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2422300000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1432100000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	210700000	USD
CY2019Q4	us-gaap	Deferred Income Taxes And Other Liabilities Noncurrent DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent	249300000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1255700000	USD
CY2019Q4	gpi	Intercompanynotereceivable Intercompanynotereceivable	0	USD
CY2019Q4	gpi	Stockholders Equity Attributableto Parent Excluding Intercompany Receivables StockholdersEquityAttributabletoParentExcludingIntercompanyReceivables	1255700000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5570200000	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	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	27300000	USD
CY2018Q4	us-gaap	Assets Assets	5001100000	USD
CY2018Q4	gpi	Floorplan Notes Payable Credit Facility Gross FloorplanNotesPayableCreditFacilityGross	1258800000	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	2386600000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1281500000	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
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	10227800000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1816000000.0	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1358400000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	22200000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	363700000	USD
CY2019	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	61600000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	74900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2019	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9200000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	164800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9876300000	USD
CY2018	us-gaap	Gross Profit GrossProfit	1725100000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1273100000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	43900000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	341100000	USD
CY2018	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	59900000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	75800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2018	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-14400000	USD
CY2019	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	7304600000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	143400000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11123700000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9478200000	USD
CY2017	us-gaap	Gross Profit GrossProfit	1645500000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1226200000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	57900000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	19500000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	341900000	USD
CY2017	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	52400000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	70500000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	219000000.0	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5600000	USD
CY2017	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	213400000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	23700000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	237200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	370900000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	143200000	USD
CY2019	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	43400000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	191800000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-291600000	USD
CY2019	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	7423200000	USD
CY2019	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	319000000.0	USD
CY2019	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	281400000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5400000	USD
CY2019	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	177400000	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	166700000	USD
CY2019	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	173500000	USD
CY2019	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	147300000	USD
CY2019	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	8600000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4400000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1400000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20300000	USD
CY2019	gpi	Borrowingsrepaymentswithsubsidiaries Borrowingsrepaymentswithsubsidiaries	0	USD
CY2019	gpi	Changeininvestmentinsubsidiaries Changeininvestmentinsubsidiaries	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67000000.0	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2900000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	9300000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2018	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	6954300000	USD
CY2018	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	6870100000	USD
CY2018	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	165300000	USD
CY2018	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	158500000	USD
CY2018	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	156000000.0	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	118800000	USD
CY2018	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	54700000	USD
CY2018	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	91500000	USD
CY2018	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	7600000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4900000	USD
CY2018	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	900000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	183900000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20900000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	28100000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	270000000.0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	135300000	USD
CY2018	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	107900000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	141000000.0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-168000000.0	USD
CY2018	gpi	Borrowingsrepaymentswithsubsidiaries Borrowingsrepaymentswithsubsidiaries	0	USD
CY2018	gpi	Changeininvestmentinsubsidiaries Changeininvestmentinsubsidiaries	0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109500000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3300000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-10900000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	29600000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	196500000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	109100000	USD
CY2017	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	10700000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	215800000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1600000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-312600000	USD
CY2017	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	7019100000	USD
CY2017	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	6957900000	USD
CY2017	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	68100000	USD
CY2017	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	42300000	USD
CY2017	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	165700000	USD
CY2017	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	121200000	USD
CY2017	gpi	Borrowings Of Long Term Debt Related To Real Estate Loans Netof Debt Issue Costs BorrowingsOfLongTermDebtRelatedToRealEstateLoansNetofDebtIssueCosts	75300000	USD
CY2017	gpi	Principal Payments Of Long Term Debt Related To Real Estate Loans PrincipalPaymentsOfLongTermDebtRelatedToRealEstateLoans	29400000	USD
CY2017	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	7100000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2500000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	40100000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20500000	USD
CY2017	gpi	Borrowingsrepaymentswithsubsidiaries Borrowingsrepaymentswithsubsidiaries	0	USD
CY2017	gpi	Changeininvestmentinsubsidiaries Changeininvestmentinsubsidiaries	0	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	121500000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5400000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24200000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	29600000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2808400000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3005700000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3118300000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3111400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	431500000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	454300000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	465600000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	464600000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1816000000.0	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	86800000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	97100000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	83300000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	96500000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	363700000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	38600000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	49200000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	38000000.0	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	48100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.09
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.65
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.04
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.57
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.35
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.08
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.64
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.57
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.34
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2860000000.0	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2943500000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2889100000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.70
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.72
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.74
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2908800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	419800000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	438200000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	435100000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	432100000	USD
CY2018	us-gaap	Gross Profit GrossProfit	1725100000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	79100000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	109200000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	78200000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	74700000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	341100000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	35800000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	56500000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	34800000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	30700000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.62
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.83
CY2019Q1	us-gaap	Loss From Catastrophes LossFromCatastrophes	2000000.0	USD
CY2019Q2	us-gaap	Loss From Catastrophes LossFromCatastrophes	4000000.0	USD
CY2019Q3	us-gaap	Loss From Catastrophes LossFromCatastrophes	11900000	USD
CY2019Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	500000	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10300000	USD
CY2019Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	11500000	USD
CY2018Q2	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	20100000	USD
CY2018Q3	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	5400000	USD
CY2018Q4	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	-300000	USD
CY2018Q2	us-gaap	Loss From Catastrophes LossFromCatastrophes	5800000	USD
CY2018Q4	us-gaap	Loss From Catastrophes LossFromCatastrophes	600000	USD
CY2018Q2	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	500000	USD
CY2018Q3	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	3100000	USD
CY2018Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	4300000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	23200000	USD
CY2018Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16500000	USD

Files In Submission

Name	View Source	Status
0001031203-20-000006-index-headers.html	Edgar Link	pending
0001031203-20-000006-index.html	Edgar Link	pending
0001031203-20-000006.txt	Edgar Link	pending
0001031203-20-000006-xbrl.zip	Edgar Link	pending
a2019exhibit211-subsid.htm	Edgar Link	pending
a2019exhibit231.htm	Edgar Link	pending
a2019exhibit311.htm	Edgar Link	pending
a2019exhibit312.htm	Edgar Link	pending
a2019exhibit321.htm	Edgar Link	pending
a2019exhibit322.htm	Edgar Link	pending
a2019exhibit408.htm	Edgar Link	pending
a2019form10-k.htm	Edgar Link	pending
a2019form10-k_htm.xml	Edgar Link	completed
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gpi-20191231.xsd	Edgar Link	pending
gpi-20191231_cal.xml	Edgar Link	unprocessable
gpi-20191231_def.xml	Edgar Link	unprocessable
gpi-20191231_lab.xml	Edgar Link	unprocessable
gpi-20191231_pre.xml	Edgar Link	unprocessable
MetaLinks.json	Edgar Link	pending
nvsalesbymanu3da07.jpg	Edgar Link	pending
nvsalesbystatea04.jpg	Edgar Link	pending
performancegraph2019a05.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
revandgpbysegmentv2.jpg	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$GPI
Group 1 Automotive Inc Stock $gpi

2019 Q4 Form 10-K Financial Statement

#000103120320000006 Filed on February 13, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPI Group 1 Automotive Inc Stock $gpi

2019 Q4 Form 10-K Financial Statement

#000103120320000006 Filed on February 13, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPI
Group 1 Automotive Inc Stock $gpi