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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | $ 47.5 | $ 76.4 | $ 26.9 |
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 | $ 0.2 | $ 1.2 | $ 1.3 |
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) | 286,800 | 93,100 | 0 |
Granted (in shares) | 276,400 | 196,500 | 100,600 |
Vested (in shares) | 0 | 0 | 0 |
Forfeited (in shares) | (31,700) | (2,800) | (7,500) |
Unvested at end of period (in shares) | 531,500 | 286,800 | 93,100 | 0
Share-based Payment Arrangement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (in shares) | 1,000,000.0 |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 1,819,100 | 652,700 | 727,700 |
Granted (in shares) | 449,500 | 1,494,500 | 277,200 |
Vested (in shares) | (571,100) | (287,700) | (292,500) |
Forfeited (in shares) | (69,800) | (40,400) | (59,700) |
Unvested at end of period (in shares) | 1,627,700 | 1,819,100 | 652,700 | 727,700
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 141.51 | $ 131.32 | $ 118.96 |
Weighted average grant date fair value, granted (in dollars per share) | 124.98 | 141.06 | 156.13 |
Weighted average grant date fair value, vested (in dollars per share) | 137.99 | 116.32 | 125.01 |
Weighted average grant date fair value, forfeitures (in dollars per share) | 136.00 | 137.49 | 131.84 |
Weighted average grant date fair value, end of period (in dollars per share) | $ 137.42 | $ 141.51 | $ 131.32 | $ 118.96
Weighted average remaining contractual life, unvested shares outstanding and expected to vest | 1 year 8 months 8 days | 2 years 4 months 20 days | 2 years 7 days | 1 year 2 months 26 days
Unamortized deferred compensation cost | $ 66.4 |  |  |
Fair value of shares vested | 78.8 | $ 33.5 | $ 43.3 |
Grant date fair value | 56.2 | 210.8 | 36.5 |
Share-based Payment Arrangement [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | 5.5 | 13.6 | 3.2 |
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 | $ 41.8 | $ 61.6 | $ 22.4 |
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) | 1,532,300 | 559,600 | 727,700 |
Granted (in shares) | 173,100 | 1,298,000.0 | 176,600 |
Vested (in shares) | (571,100) | (287,700) | (292,500) |
Forfeited (in shares) | (38,100) | (37,600) | (52,200) |
Unvested at end of period (in shares) | 1,096,200 | 1,532,300 | 559,600 | 727,700
Vesting Period One [Member] | Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |
Vesting Period Two [Member] | Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |  |
HFF Acquisition [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares Granted to Employees in Conjunction with Acquisition |  | 1,111,300 |  |
HFF Acquisition [Member] | Share-based Payment Arrangement [Member] |  |  |  |
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Unamortized deferred compensation cost | $ 32.3 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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