XML 124 R43.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Organization (Details) $ in Millions, ft² in Billions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) ft² employee	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) ft² employee	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of employees | employee	93,000								93,000
Number of employees whose costs are reimbursed by clients | employee	38,800								38,800
Portfolio of property and corporate facility management (in square feet) | ft²	5.1								5.1
Assets under management by LaSalle Investment Management	$ 67,600.0								$ 67,600.0
Product Information [Line Items]
Revenue:	$ 5,400.5	$ 4,495.6	$ 4,266.5	$ 3,820.6	$ 4,889.7	$ 3,969.8	$ 3,903.7	$ 3,555.2	17,983.2	$ 16,318.4	$ 14,453.2
Real Estate Services: Leasing [Member]
Product Information [Line Items]
Revenue:									2,524.0	2,372.1	2,051.9
Real Estate Services: Capital Markets and Hotels [Member]
Product Information [Line Items]
Revenue:									1,542.2	1,145.4	1,149.4
Real Estate Services: Property & Facilities Management [Member]
Product Information [Line Items]
Revenue:									9,364.7	8,782.8	7,821.3
Real Estate Services: Project & Development Services [Member]
Product Information [Line Items]
Revenue:									3,121.5	2,669.0	2,344.5
Real Estate Services: Advisory, Consulting and Other [Member]
Product Information [Line Items]
Revenue:									904.7	815.2	730.3
LaSalle Investment Management [Member]
Product Information [Line Items]
Revenue:									$ 526.1	$ 533.9	$ 355.8

X

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of employees whose costs are reimbursed by clients.

+ References

No definition available.

+ Details

Name:	jll_NumberOfEmployeesWhoseCostsAreReimbursedByClients
Namespace Prefix:	jll_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The carrying amount of assets an investment adviser manages on behalf of investors.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsUnderManagementCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_ProductInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=jll_RealEstateServicesLeasingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=jll_RealEstateServicesCapitalMarketsAndHotelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=jll_RealEstateServicesPropertyAndFacilitiesManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=jll_RealEstateServicesProjectAndDevelopmentServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=jll_RealEstateServicesAdvisoryConsultingAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=jll_LasalleInvestmentManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: