XML 49 R34.htm IDEA: XBRL DOCUMENT
v3.25.3

Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions | Sep. 30, 2025 USD ($) acquisition | Dec. 31, 2024 USD ($) acquisition
--- | --- | ---
Summary of Earn-out Payments [Line Items] |  |
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition | 12 | 13
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value | $ 75.2 | $ 108.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Summary of Earn-out Payments [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Current | 6.0 | 12.0
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 10.1 | $ 23.8

X
- Definition Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value + References No definition available. + Details
Name: | jll_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesHighValue
Namespace Prefix: | jll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of acquisitions subject to potential earn-out payment provisions. + References No definition available. + Details
Name: | jll_NumberOfAcquisitionsSubjectToPotentialEarnOutPaymentsProvisions
Namespace Prefix: | jll_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition [Line Items] for Summary of Earn-out Payments [Table] + References No definition available. + Details
Name: | jll_SummaryofEarnoutPaymentsLineItems
Namespace Prefix: | jll_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |