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Credit Facility (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | $ 1,438.6 |  | $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity | 86.0 |  |
Letters of Credit Outstanding, Amount | 0.7 |  | 0.8
Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | 1,438.6 |  | $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity | 2,750.0 |  |
Line of Credit Facility, Average Outstanding Amount | $ 935.2 | $ 209.0 |
Pricing on the Facility based on market rates | LIBOR plus 0.875% to 1.35% |  |
Description of Variable Rate Basis | LIBOR |  |
Basis spread on variable rate (in hundredths) | 0.95% |  |
Line of Credit Facility, Interest Rate During Period | 2.40% | 3.30% |

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- Definition Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs + References No definition available. + Details
Name: | jll_LongtermLineofCreditNoncurrentNetofDebtIssuanceCosts
Namespace Prefix: | jll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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