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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | $ 75.3 | $ 80.1 | $ 47.5 |
Stock Options [Member] | U.K. Save As You Earn (SAYE) Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | $ 0.0 | $ 0.0 | $ 0.2 |
Number of shares available for grant (in shares) | 281,000 |  |  |
Performance Shares [Member] |  |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 646,000.0 | 531,500 | 286,800 |
Granted (in shares) | 116,500 | 218,900 | 276,400 |
Vested (in shares) | (175,100) | (79,000.0) | 0 |
Forfeited (in shares) | (20,400) | (25,400) | (31,700) |
Unvested at end of period (in shares) | 567,000.0 | 646,000.0 | 531,500 | 286,800
Share-based Payment Arrangement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (in shares) | 600,000 |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 1,558,400 | 1,627,700 | 1,819,100 |
Granted (in shares) | 469,700 | 554,600 | 449,500 |
Vested (in shares) | (570,800) | (550,100) | (571,100) |
Forfeited (in shares) | (49,000.0) | (73,800) | (69,800) |
Unvested at end of period (in shares) | 1,408,300 | 1,558,400 | 1,627,700 | 1,819,100
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 152.27 | $ 137.42 | $ 141.51 |
Weighted average grant date fair value, granted (in dollars per share) | 204.05 | 189.40 | 124.98 |
Weighted average grant date fair value, vested (in dollars per share) | 147.78 | 145.54 | 137.99 |
Weighted average grant date fair value, forfeitures (in dollars per share) | 168.92 | 148.97 | 136.00 |
Weighted average grant date fair value, end of period (in dollars per share) | $ 170.78 | $ 152.27 | $ 137.42 | $ 141.51
Weighted average remaining contractual life, unvested shares outstanding and expected to vest | 1 year 9 months 14 days | 1 year 11 months 26 days | 1 year 8 months 8 days | 2 years 4 months 20 days
Unamortized deferred compensation cost | $ 79.4 |  |  |
Fair value of shares vested | 84.3 | $ 80.1 | $ 78.8 |
Grant date fair value | 95.8 | 105.0 | 56.2 |
Share-based Payment Arrangement [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | 26.8 | 42.4 | 5.5 |
Share-based Payment Arrangement [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | $ 48.5 | $ 37.7 | $ 41.8 |
Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Discount on purchase price (in hundredths) | 15.00% |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 912,400 | 1,096,200 | 1,532,300 |
Granted (in shares) | 353,200 | 335,700 | 173,100 |
Vested (in shares) | (395,700) | (471,100) | (571,100) |
Forfeited (in shares) | (28,600) | (48,400) | (38,100) |
Unvested at end of period (in shares) | 841,300 | 912,400 | 1,096,200 | 1,532,300

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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