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CASH FLOW INFORMATION - Non-cash Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Operating leases, initial recognition	$ 0.0	$ 0.1
Operating leases, modifications and remeasurements	0.3	11.9
Finance leases, initial recognition	0.2	10.0
Finance leases, modifications and remeasurements	$ 0.0	$ (1.5)

X

- Definition

Right-of-Use Asset Obtained in Exchange for Finance Lease Liability, Modifications and Remeasurements

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, Modifications and Remeasurements

+ References

No definition available.

+ Details

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Namespace Prefix:	gpi_
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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- References

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