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Subsequent Events Subsequent Event (Details) - Subsequent Event [Member] - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Aug. 03, 2016 | Aug. 01, 2016
Subsequent Event [Line Items] |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 251
payment to acquire business - Integral UK Ltd. | $ 341 |
Payment to acquire businesses-excluding Integral | $ 100 |

X
- Definition Maximum potential payments to acquire businesses-excluding Integral + References No definition available. + Details
Name: | jll_MaximumpotentialpaymentstoacquirebusinessesexcludingIntegral
Namespace Prefix: | jll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum potential payment to acquire business - Integral UK Ltd. + References No definition available. + Details
Name: | jll_MaximumpotentialpaymenttoacquirebusinessIntegralUKLtd.
Namespace Prefix: | jll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments to acquire businesses, net of cash acquired- Integral UK Ltd + References No definition available. + Details
Name: | jll_PaymentstoacquirebusinessesnetofcashacquiredIntegralUKLtd
Namespace Prefix: | jll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |