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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | $ 74.9 | $ 75.3 | $ 80.1 |
Other Stock Compensation Programs [Abstract] |  |  |  |
Amortization of Other Deferred Charges (Reversal) | $ 13.5 |  |  |
Stock Options [Member] | U.K. Save As You Earn (SAYE) Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
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) | 567,000.0 | 646,000.0 | 531,500 |
Granted (in shares) | 185,200 | 116,500 | 218,900 |
Vested (in shares) | (257,200) | (175,100) | (79,000.0) |
Forfeited (in shares) | (36,900) | (20,400) | (25,400) |
Unvested at end of period (in shares) | 458,100 | 567,000.0 | 646,000.0 | 531,500
Share-based Payment Arrangement [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (in shares) | 910,000 |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 1,408,300 | 1,558,400 | 1,627,700 |
Granted (in shares) | 705,700 | 469,700 | 554,600 |
Vested (in shares) | (554,000.0) | (570,800) | (550,100) |
Forfeited (in shares) | (111,800) | (49,000.0) | (73,800) |
Unvested at end of period (in shares) | 1,448,200 | 1,408,300 | 1,558,400 | 1,627,700
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 170.78 | $ 152.27 | $ 137.42 |
Weighted average grant date fair value, granted (in dollars per share) | 143.64 | 204.05 | 189.40 |
Weighted average grant date fair value, vested (in dollars per share) | 126.28 | 147.78 | 145.54 |
Weighted average grant date fair value, forfeitures (in dollars per share) | 164.42 | 168.92 | 148.97 |
Weighted average grant date fair value, end of period (in dollars per share) | $ 175.07 | $ 170.78 | $ 152.27 | $ 137.42
Weighted average remaining contractual life, unvested shares outstanding and expected to vest | 1 year 7 months 28 days | 1 year 9 months 14 days | 1 year 11 months 26 days | 1 year 8 months 8 days
Unamortized deferred compensation cost | $ 79.2 |  |  |
Fair value of shares vested | 70.0 | $ 84.3 | $ 80.1 |
Grant date fair value | 101.4 | 95.8 | 105.0 |
Share-based Payment Arrangement [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense | 9.0 | 26.8 | 42.4 |
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 | $ 65.9 | $ 48.5 | $ 37.7 |
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) | 841,300 | 912,400 | 1,096,200 |
Granted (in shares) | 520,500 | 353,200 | 335,700 |
Vested (in shares) | (296,800) | (395,700) | (471,100) |
Forfeited (in shares) | (74,900) | (28,600) | (48,400) |
Unvested at end of period (in shares) | 990,100 | 841,300 | 912,400 | 1,096,200

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