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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue Recognition [Abstract]
Gross revenue and expenses for management services	$ 258.2	$ 191.7	$ 477.5	$ 366.1

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- Definition

Reimbursement for contract vendor and subcontractor costs that is deducted from gross revenue.

+ References

No definition available.

+ Details

Name:	jll_GrossRevenueAndExpensesForManagementServices
Namespace Prefix:	jll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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