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Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 2,068.4 | $ 1,947.3
Less: accumulated depreciation and amortization | 460.2 | 400.2
Property and equipment, net | 1,608.2 | 1,547.1
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 619.8 | 571.3
Building [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 1,107.1 | 1,067.6
Machinery and dealership equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 145.8 | 138.2
Office equipment, furniture and fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 124.1 | 118.5
Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | 15.0 | 15.1
Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 56.6 | $ 36.5

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- Definition Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization + References No definition available. + Details
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Namespace Prefix: | gpi_
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- Definition Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization + References No definition available. + Details
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Namespace Prefix: | gpi_
Data Type: | xbrli:monetaryItemType
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- Definition Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |