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Retirement Plans and Postretirement Benefits - Schedule of Allocation of Plan Assets (Details)	Dec. 31, 2024
Pendragon Group Pension Scheme | Credit
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	19.00%
Pendragon Group Pension Scheme | Diversified
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	5.00%
Pendragon Group Pension Scheme | Equities
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	5.00%
Pendragon Group Pension Scheme | Illiquids
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	10.00%
Pendragon Group Pension Scheme | Liability matching
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	57.00%
Pendragon Group Pension Scheme | Secure income
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	0.00%
Pendragon Group Pension Scheme | Special purpose investment vehicle
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	5.00%
Jardine Motors Group UK Pension Scheme | Credit
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	0.00%
Jardine Motors Group UK Pension Scheme | Diversified
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	54.00%
Jardine Motors Group UK Pension Scheme | Equities
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	0.00%
Jardine Motors Group UK Pension Scheme | Illiquids
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	0.00%
Jardine Motors Group UK Pension Scheme | Liability matching
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	38.00%
Jardine Motors Group UK Pension Scheme | Secure income
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	8.00%
Jardine Motors Group UK Pension Scheme | Special purpose investment vehicle
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Allocation target	0.00%

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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