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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated share-based compensation expense | $ 26.9 | $ 25.2 | $ 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] |  |  |
Number of shares available for grant (in shares) | 260,000 |  |
Allocated share-based compensation expense | $ 1.3 | $ 1.4 | $ 1.4
Other Stock Compensation Programs [Abstract] |  |  |
Options granted (in shares) | 0 | 85,000 | 0
Exercise price - options granted (in dollars per share) | $ 0.00 | $ 90.97 | $ 0.00
Options exercised (in shares) | 19,000 | 28,000 | 20,000
Weighted average exercise price (in dollars per share) | $ 142.96 | $ 121.70 | $ 70.37
Stock Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant (in shares) | 1,300,000 |  |
Stock Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated share-based compensation expense | $ 25.6 | $ 23.8 | $ 25.5
Restricted Stock Units (RSUs) [Member] |  |  |
Restricted stock unit activity [Roll Forward] |  |  |
Unvested at beginning of period (in shares) | 727,700 | 750,900 | 706,000
Granted (in shares) | 277,200 | 188,400 | 299,300
Vested (in shares) | (292,500) | (186,500) | (203,600)
Forfeited (in shares) | (59,700) | (25,100) | (50,800)
Unvested at end of period (in shares) | 652,700 | 727,700 | 750,900
Restricted stock unit activity, additional disclosures [Abstract] |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 118.96 | $ 113.97 | $ 111.78
Weighted average grant date fair value, granted (in dollars per share) | 156.13 | 119.08 | 107.74
Weighted average grant date fair value, vested (in dollars per share) | 125.01 | 99.23 | 96.37
Weighted average grant date fair value, forfeited (in dollars per share) |  |  | 117.48
Weighted average grant date fair value, end of period (in dollars per share) | $ 131.32 | $ 118.96 | $ 113.97
Weighted average remaining contractual life, unvested shares outstanding and expected to vest | 2 years 8 days | 1 year 2 months 26 days | 1 year 8 months 15 days
Unamortized deferred compensation cost | $ 36.6 |  |
Fair value of shares vested | 43.3 | $ 18.5 | $ 19.6
Grant date fair value | $ 36.5 | $ 22.4 | $ 32.2
Other Stock Compensation Programs [Abstract] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ 131.84 | $ 117.07 |
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% |  |
Other Stock Compensation Programs [Abstract] |  |  |
Options outstanding (in shares) | 97,000 | 133,000 | 128,000
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 |  |

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