Jones Lang LaSalle (JLL) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	JONES LANG LASALLE INC
Entity Central Index Key	1,037,976
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,566,557
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 327	$ 268
Trade receivables, net of allowances	1,610	1,739.4
Notes and other receivables	297.6	385.3
Accounts Receivable, Reimbursed by Client, Current	1,400.8	1,263.3
Warehouse receivables	617.7	317.5
Contract with Customer, Asset, Net, Current	293	178.4
Prepaid Expense and Other Assets, Current	315.2	389.1
Total current assets	4,861.3	4,541
Property and equipment, net of accumulated depreciation	540.8	543.9
Goodwill	2,689.7	2,709.3
Identified intangibles, net of accumulated amortization	291.5	305
Investments in real estate ventures	371.5	376.2
Long-term receivables	179.6	164.7
Deferred tax assets, net	242.5	229.1
Deferred Compensation Plan Assets	277.8	229.7
Other	164.4	155.5
Total assets	9,619.1	9,254.4
Current liabilities:
Accounts Payable and Accrued Liabilities, Current	995.1	993.1
Accounts Payable, Reimbursed by Client, Current	1,012.2	1,022.6
Accrued compensation & benefits	1,205.7	1,419.1
Short-term borrowings	83.7	77.4
Short-term contract liabilities and deferred income	170.9	155.4
Business Combination, Contingent Consideration, Liability, Current	60	80.1
Warehouse facilities	611.9	309.2
Other	195.2	256.8
Total current liabilities	4,334.7	4,313.7
Noncurrent liabilities:
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs	223.2	(15.3)
Long-term debt, net of debt issuance costs	677.3	690.6
Deferred tax liabilities, net	24.5	63.2
Deferred compensation	290.2	259
Business Combination, Contingent Consideration, Liability, Noncurrent	168.1	228.9
Other	328.3	332.3
Total liabilities	6,046.3	5,872.4
Redeemable Noncontrolling Interest	0	3.8
Company shareholders' equity:
Common stock, $.01 par value per share	0.5	0.5
Additional paid-in capital	1,049.5	1,037.3
Retained earnings	2,913.3	2,649
Shares held in trust	(6)	(5.9)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(425.3)	(340.8)
Total Company shareholders' equity	3,532	3,340.1
Noncontrolling interest	40.8	38.1
Total equity	3,572.8	3,378.2
Total liabilities and equity	$ 9,619.1	$ 9,254.4

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Trade receivables, allowances	$ 57.6	$ 51.3
Property and equipment, accumulated depreciation	583.7	514.9
Identified intangibles, with finite useful lives, accumulated amortization	161.1	165.9
Investments, Fair Value Disclosure	$ 246	$ 242.3
Company shareholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Issued	45,560,315	45,373,817
Common stock, shares outstanding (in shares)	45,560,315	45,373,817
Long-Term Senior Notes [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 3.9	$ 4.3
Line of Credit [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 16.8	$ 15.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue Before Reimbursements	$ 2,213.7	$ 1,980.7	$ 6,268.1	$ 5,471.5
Reimbursement Revenues	1,756.1	1,541.5	5,160.6	4,638.7
Revenue	3,969.8	3,522.2	11,428.7	10,110.2
Operating expenses:
Compensation and benefits	1,287	1,155.4	3,624.7	3,199.4
Operating, administrative and other	689.4	642.3	2,124.5	1,852.5
Cost of Reimbursable Expenses	1,756.1	1,541.5	5,160.6	4,638.7
Depreciation and amortization	42.7	41.8	131.1	122.3
Restructuring and acquisition charges	3.7	3.4	(6.7)	13.3
Total operating expenses	3,778.9	3,384.4	11,034.2	9,826.2
Operating Income (Loss)	190.9	137.8	394.5	284
Interest Expense, Net of Interest Income	12.3	14.9	40.4	42.5
Equity earnings from real estate ventures	3.4	12.6	27.2	32.7
Other Nonoperating Income (Expense)	(0.3)	(0.3)	3.9	0.7
Income before income taxes and noncontrolling interest	181.7	135.2	385.2	274.9
Provision for income taxes	45.6	36	96.7	73.1
Net income	136.1	99.2	288.5	201.8
Net income attributable to noncontrolling interest	1.2	0.9	5.3	1.8
Net income attributable to the Company	134.9	98.3	283.2	200
Dividends, Share-based Compensation	0	0	0.2	0.2
Net income attributable to common shareholders	$ 134.9	$ 98.3	$ 283	$ 199.8
Basic earnings per common share (in dollars per share)	$ 2.96	$ 2.17	$ 6.22	$ 4.41
Basic weighted average shares outstanding (in shares)	45,549	45,349	45,495	45,299
Diluted earnings per common share (in dollars per share)	$ 2.93	$ 2.15	$ 6.16	$ 4.37
Diluted weighted average shares outstanding (in shares)	45,965	45,814	45,930	45,729
Common Stock, Dividends, Per Share, Declared	$ 0	$ 0	$ 0.41	$ 0.35
Other comprehensive income:
Net income attributable to the Company	$ 134.9	$ 98.3	$ 283.2	$ 200
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1.2	1.2	1.2	2
Foreign currency translation adjustments	(34.9)	46	(85.7)	175.5
Comprehensive income attributable to the Company	$ 101.2	$ 145.5	$ 198.7	$ 377.5

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Shares Held in Trust [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balances at Dec. 31, 2016						$ (551)
Increase (decrease) in shareholders' equity [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	$ 2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						175.5
Foreign currency translation adjustments	175.5
Balances at Sep. 30, 2017						(373.5)
Balances at Jun. 30, 2017						(420.7)
Increase (decrease) in shareholders' equity [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						1.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1.2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						46
Foreign currency translation adjustments	$ 46
Balances at Sep. 30, 2017						(373.5)
Common Stock, Shares, Issued at Dec. 31, 2017	45,373,817
Balances at Dec. 31, 2017	$ 3,378.2	$ 0.5	$ 1,037.3	$ 2,649	$ (5.9)	(340.8)	$ 38.1
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	288.5			283.2			5.3
Shares issued under stock compensation programs (in shares)		261,048
Shares issued under stock compensation programs	0.8		0.8
Shares repurchased for payment of taxes on stock awards (in shares)		(74,550)
Shares repurchased for payment of taxes on stock awards	(11.9)		(11.9)
Amortization of stock compensation	21		21
Dividends, Common Stock, Cash	(18.9)			(18.9)
(Increase) Decrease In Common Stock Held In Trust	(0.1)				(0.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						1.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1.2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						(85.7)
Foreign currency translation adjustments	(85.7)
Distributions to noncontrolling interest	$ (2.6)						(2.6)
Common Stock, Shares, Issued at Sep. 30, 2018	45,560,315
Balances at Sep. 30, 2018	$ 3,572.8	$ 0.5	1,049.5	2,913.3	(6)	(425.3)	40.8
Balances at Jun. 30, 2018						(391.6)
Increase (decrease) in shareholders' equity [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						1.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1.2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						(34.9)
Foreign currency translation adjustments	$ (34.9)
Common Stock, Shares, Issued at Sep. 30, 2018	45,560,315
Balances at Sep. 30, 2018	$ 3,572.8	$ 0.5	1,049.5	$ 2,913.3	$ (6)	$ (425.3)	$ 40.8
Increase (decrease) in shareholders' equity [Roll Forward]
Redeemable Noncontrolling Interest, Equity, Redemption Value	$ 2.3		$ 2.3

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Equity Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statement of Change in Equity (Parenthetical) [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0	$ 0	$ 0.41	$ 0.35

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows used for operating activities:
Net income	$ 288.5	$ 201.8
Adjustments to reconcile net income to net cash used in operating activities:
Distributions of earnings from real estate ventures	30.2	24.2
Other adjustment, net	114.3	122.4
Changes in working capital, net	(433.3)	(70.7)
Net cash used in operating activities	(0.3)	277.7
Cash flows used in investing activities:
Net capital additions - property and equipment	(110.1)	(98.1)
Acquisition of investment properties (less than wholly-owned)	(34.9)	0
Proceeds from Sales of Assets, Investing Activities	24.3	0
Business acquisitions, net of cash acquired	(31.7)	(18.7)
Payments to Acquire Interest in Joint Venture	(38.3)	(27)
Proceeds from Real Estate and Real Estate Joint Ventures	40.4	24.9
Other, net	3.1	(3.1)
Net cash used in investing activities	(147.2)	(122)
Cash flows provided by financing activities:
Proceeds from Issuance of Senior Long-term Debt	0	395.7
Proceeds from borrowings under credit facility	2,511	2,478
Repayments of borrowings under credit facility	(2,271)	(2,953)
Payment for Contingent Consideration Liability, Financing Activities	(47.8)	(41.2)
Payments of Ordinary Dividends, Common Stock	(18.9)	(16.1)
Other, net	(0.8)	(28.8)
Net cash provided by financing activities	172.5	(165.4)
Effect of currency exchange rate on Cash and Cash Equivalents	(20.9)	11.4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	4.1	1.7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	471.7	454
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	475.8	455.7
Supplemental disclosure of cash flow information:
Restricted Cash	148.8	177.9
Cash paid during the period for:
Interest	(33.1)	(33.6)
Income taxes, net of refunds	(108)	(112.6)
Non-cash activities
Business acquisitions, including contingent consideration	2.7	11.5
Deferred business acquisition obligations	$ 1.9	$ 1.8

Interim Information

Interim Information	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Information	1. INTERIM INFORMATION Readers of this quarterly report should refer to the audited financial statements of Jones Lang LaSalle Incorporated ("JLL," which may also be referred to as "the Company" or as "we," "us" or "our") for the year ended December 31, 2017 , which are included in our 2017 Annual Report on Form 10-K, filed with the United States Securities and Exchange Commission ("SEC") and also available on our website ( www.jll.com ), since we have omitted from this quarterly report certain footnote disclosures which would substantially duplicate those contained in such audited financial statements. You should also refer to the "Summary of Critical Accounting Policies and Estimates" section within Item 7. Management's Discussion and Analysis of Financial Condition and Result of Operations and to Note 2, Summary of Significant Accounting Policies, in the Notes to Consolidated Financial Statements in our 2017 Annual Report on Form 10-K for further discussion of our significant accounting policies and estimates. Our Condensed Consolidated Financial Statements as of September 30, 2018 and December 31, 2017 , and for the periods ended September 30, 2018 and 2017 , are unaudited. In the opinion of management, we have included all adjustments (consisting solely of normal recurring adjustments) necessary for a fair presentation of the Condensed Consolidated Financial Statements for these interim periods. We have reclassified or recast certain prior-year amounts in conjunction with the adoption of new accounting standards and to conform to the current year presentation. Refer to Note 2, New Accounting Standards, for additional information. Historically, our quarterly revenue and profits have tended to increase from quarter to quarter as the year progresses. This is the result of a general focus in the real estate industry on completing transactions by calendar year end, while certain expenses are recognized evenly throughout the year. Our LaSalle Investment Management ("LaSalle") segment generally earns investment-generated performance fees on clients' real estate investment returns when assets are sold, the timing of which is geared toward the benefit of our clients, as well as co-investment equity gains and losses, primarily dependent on underlying valuations. Within our Real Estate Services ("RES") segments, revenue from capital markets activities is driven by the size and timing of our clients' transactions and can fluctuate significantly from period to period. A significant portion of our compensation and benefits expense is from incentive compensation plans, which we generally accrue throughout the year based on progress toward annual performance targets. This process can result in significant fluctuations in quarterly compensation and benefits expense from period to period. Non-variable operating expenses, which we recognize when incurred during the year, are relatively constant on a quarterly basis. We provide for the effects of income taxes on interim financial statements based on our estimate of the effective tax rate for the full year, which we base on forecasted income by country and expected enacted tax rates; as required, we adjust for the impact of discrete items in the quarters in which they occur. Changes in the geographic mix of income can impact our estimated effective tax rate. As a result of the items mentioned above, the results for the periods ended September 30, 2018 and 2017 are not fully indicative of what our results will be for the full fiscal year.

New Accounting Standards New Ac

New Accounting Standards New Accounting Standards	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
New Accounting Standards	2. NEW ACCOUNTING STANDARDS Recently adopted accounting guidance Effective January 1, 2018, we adopted Accounting Standards Update ("ASU") No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which requires an employer to disaggregate the employer service cost component from the other components of net periodic pension cost. The primary impact for JLL is the requirement to present the components of net periodic pension cost that do not represent the employer service cost outside of the subtotal "Operating income" on the Condensed Consolidated Statements of Comprehensive Income. As full retrospective application is required, we recast our comparative information, reclassifying the components of net periodic pension cost, other than the employer service cost component, from Compensation and benefits expense to Other income on the Condensed Consolidated Statements of Comprehensive Income. For the three and nine months ended September 30, 2017, the amount reclassified was a cost of $0.3 million and a benefit of $0.7 million , respectively. The adoption of ASU 2017-07 had no impact on our Condensed Consolidated Balance Sheets or Condensed Consolidated Statements of Cash Flows. Refer to the table below for the impact of adopting this ASU on our comparative Condensed Consolidated Statement of Comprehensive Income. Effective January 1, 2018, we adopted ASU No. 2016-18, Restricted Cash , which addresses classification and presentation of changes in restricted cash on the statement of cash flows. Specifically, this ASU requires a statement of cash flows to explain the changes during the period in cash, cash equivalents, and amounts reported as restricted cash or restricted cash equivalents. The primary effect of the adoption was the inclusion of restricted cash along with cash and cash equivalents in reconciling the beginning and ending total amounts shown on the Condensed Consolidated Statements of Cash Flows. We adopted this ASU on a full retrospective basis. Restricted cash is included in Prepaid and other current assets on the Condensed Consolidated Balance Sheets. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers; in March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , which clarifies the implementation guidance on principal versus agent considerations and together with ASU No. 2014-09 (collectively the "ASUs"), amends and comprises ASC Topic 606, Revenue from Contracts with Customers. These ASUs, and other related ASUs, replaced most existing revenue recognition guidance in U.S. generally accepted accounting principles ("U.S. GAAP"). Effective January 1, 2018, we adopted ASC Topic 606 on a full retrospective basis. The adoption of ASC Topic 606 resulted in an acceleration of the timing of revenue recognition for certain brokerage-related transaction commissions and advisory services. These items include variable consideration or other aspects, such as contingencies, that precluded revenue recognition contemporaneous with the satisfaction of our performance obligations within the previous revenue recognition framework. The acceleration of the timing of revenue recognition also resulted in the acceleration of expense recognition relating to direct commissions expense payable to brokers. Implementation of the updated principal versus agent considerations in ASC Topic 606 resulted in a significant increase to the proportion of our Property & Facility Management and Project & Development Services contracts presented on a gross basis (hereafter “gross contracts”). Under the previous principal versus agent framework, our evaluations for presentation of a service contract contemplated both performance and payment risk. Contractual provisions with clients and third-party vendors and subcontractors, such as “pay-when-paid”, that substantially mitigate our payment risk with respect to on-site personnel and other expenses incurred on our clients’ behalf have historically resulted in the majority of our service contracts being presented on a net basis. However, within ASC Topic 606, payment risk is not an evaluation factor; instead, control of the service before transfer to the customer is the focal point of current principal versus agent assessments. As a result, we determined that costs associated with all client-dedicated JLL personnel, even when directly reimbursed by clients, and arrangements where we control the services provided by a third-party prior to the transfer to the customer will now be presented on a gross basis. The incremental expenses and corresponding revenue recognized as a result of the adoption of the new principal versus agent framework are presented in new financial statement captions, Reimbursed expenses and Reimbursements, respectively, in our Condensed Consolidated Statements of Comprehensive Income. We have reclassified reimbursable activity in our comparative financial statements. Finally, the adoption of ASC Topic 606 resulted in a material increase to total assets and total liabilities to reflect (i) contract assets and accrued commissions payable recognized upon acceleration of the timing of revenue recognition for certain transactions commissions and advisory services and (ii) assets and liabilities relating to service contracts now reported on a gross basis. Balance sheet activity associated with contracts now reported on a gross basis is most prominently reflected within Reimbursable receivables and Reimbursable payables, new financial statement captions established in conjunction with our adoption of ASC Topic 606. We have reclassified reimbursable balances in our comparative financial statements. The impact of adopting new accounting pronouncements on a retrospective basis to the Consolidated Balance Sheet as of December 31, 2017, and Condensed Consolidated Statement of Comprehensive Income for the three and nine months ended September 30, 2017 , were as follows (for impacted financial statement captions): (in millions) Published December 31, 2017 (audited) Adjustment due to ASC Topic 606 As Restated December 31, 2017 (unaudited) Assets Trade receivables, net of allowances (1) $ 2,118.1 (378.7 ) $ 1,739.4 Note and other receivables (1) 393.6 (8.3 ) 385.3 Reimbursable receivables n/a 1,263.3 1,263.3 Short-term contract assets n/a 178.4 178.4 Prepaid & other current assets (2) 257.7 131.4 389.1 Long-term receivables 168.6 (3.9 ) 164.7 Other assets 97.8 57.7 155.5 Liabilities and equity Accounts payable and accrued liabilities (1) $ 1,011.6 (18.5 ) $ 993.1 Reimbursable payables n/a 1,022.6 1,022.6 Accrued compensation & benefits 1,309.0 110.1 1,419.1 Short-term contract liabilities and deferred income (1) 158.9 (3.5 ) 155.4 Other current liabilities (1) 263.8 (7.0 ) 256.8 Deferred tax liabilities, net 23.9 39.3 63.2 Retained earnings 2,552.8 96.2 2,649.0 Accumulated other comprehensive (loss) income (341.8 ) 1.0 (340.8 ) (1) Adjustments in these captions reflect reclassifications to new financial statement captions, Reimbursable receivables and Reimbursable payables. (2) Adjustments in this caption reflect an increase to restricted cash held on behalf of clients for contracts now presented on a gross basis. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Revenue Revenue before reimbursements (1) $ 1,947.0 33.7 — $ 1,980.7 Reimbursements (1) n/a 1,541.5 — 1,541.5 Total revenue 1,947.0 1,575.2 — 3,522.2 Operating expenses Compensation and benefits (1) 1,132.3 23.4 (0.3 ) 1,155.4 Operating, administrative and other (1) 651.4 (9.1 ) — 642.3 Reimbursed expenses (1) n/a 1,541.5 — 1,541.5 Operating income 118.1 19.4 0.3 137.8 Other income — — (0.3 ) (0.3 ) Provision for income taxes 28.2 7.8 — 36.0 Net income 87.5 11.7 — 99.2 Basic earnings per common share $ 1.91 0.26 — $ 2.17 Diluted earnings per common share $ 1.89 0.26 — $ 2.15 (1) Included in "Adjustments due to ASC Topic 606" is $13.3 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Nine months ended September 30, 2017 Revenue Revenue before reimbursements (1) $ 5,396.9 74.6 — $ 5,471.5 Reimbursements (1) n/a 4,638.7 — 4,638.7 Total revenue 5,396.9 4,713.3 — 10,110.2 Operating expenses Compensation and benefits (1) 3,146.6 52.1 0.7 3,199.4 Operating, administrative and other (1) 1,870.0 (17.5 ) — 1,852.5 Reimbursed expenses (1) n/a 4,638.7 — 4,638.7 Operating income 244.7 40.0 (0.7 ) 284.0 Other income — — 0.7 0.7 Provision for income taxes 57.3 15.8 — 73.1 Net income 177.5 24.3 — 201.8 Basic earnings per common share $ 3.88 0.53 — $ 4.41 Diluted earnings per common share $ 3.84 0.53 — $ 4.37 (1) Included in "Adjustments due to ASC Topic 606" is $43.5 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses. The cumulative impact to our retained earnings and Condensed Consolidated Statement of Comprehensive Income includes certain direct expenses, such as accrued commissions and deferred income taxes, resulting from the changes in accounting principle in accordance with ASC Topic 250, which partially offset the impact of the acceleration of revenue. The cumulative impact to our retained earnings from the adoption of ASC Topic 606, as of January 1, 2016, was $62.6 million . Recently issued accounting guidance, no t yet adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which increases transparency and comparability by requiring the recognition of lease assets and lease liabilities on the balance sheet as well as requiring the disclosure of key information about leasing arrangements. This ASU is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. In July 2018, the FASB codified an alternative (and optional) transition method via ASU No. 2018-11, Leases (Topic 842): Targeted Improvements ; we will elect the use of this optional transition method. The adoption of ASC Topic 842 will result in the recognition of additional balances on the Condensed Consolidated Balance Sheet to reflect right-of-use assets and lease liabilities primarily associated with the leases for the corporate real estate we occupy around the globe. We expect the balance of our lease population to comprise vehicle and other equipment leases. As of September 30, 2018, we have substantially completed the identification of our real estate and non-real estate leases population. Our efforts are now directed to compiling and calculating the relevant inputs to derive ASC Topic 842's impact along with designing post-implementation processes and associated internal controls. Based upon current evaluations, we expect to recognize additional assets and liabilities upon implementation of ASC Topic 842 ranging from $500 million to $750 million to reflect right-of-use assets and lease liabilities as of January 1, 2019. However, because our evaluations are ongoing, the expected impact associated with the implementation of ASC Topic 842 is subject to change. Our disclosures related to leases will expand to comply with the requirements of ASC Topic 842; we continue to evaluate other effects ASC Topic 842 will have on our financial statements and related disclosures. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) , which creates a new framework to evaluate financial instruments, such as trade receivables, for expected credit losses. This new framework replaces the existing incurred loss approach and is expected to result in more timely recognition of credit losses. ASU No. 2016-13 is effective for annual and interim periods beginning after December 15, 2019 and early adoption is not permitted until years beginning after December 15, 2018. We are evaluating the effect this guidance will have on our financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which eliminates Step 2 from the goodwill impairment test. The annual goodwill impairment test will require companies to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge when the carrying amount exceeds the fair value of the reporting unit. This ASU is effective for annual and interim goodwill impairment tests beginning after December 15, 2019, with early adoption permitted. We do not believe this guidance will have a material impact on our financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-15, Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract , which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in ASC 350-40 when determining which implementation costs to capitalize as intangible assets. This ASU is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. We do not believe this guidance will have a material impact on our financial statements and related disclosures.

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition (Notes)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	3. REVENUE RECOGNITION We earn revenue from the following: • Leasing; • Capital Markets; • Property & Facility Management; • Project & Development Services; • Advisory, Consulting and Other; and • LaSalle. Leasing Leasing revenue is earned from brokerage commissions as we represent tenants and/or landlords in connection with real estate leases. Our performance obligation is to facilitate the execution of a lease agreement, which is satisfied at a point in time, upon lease execution. Generally, we are either entitled to the full consideration upon lease execution or in part upon lease execution with the remainder upon the occurrence of a future event outside of our control (e.g. tenant occupancy, lease commencement, or rent commencement). The majority of the events that preclude our entitlement to the full consideration upon lease execution are considered to be “normal course of business” and, as a result, do not result in a constraint upon the recognition of revenue. In the infrequent instance our fee entitlement in a contract with a customer is predicated on the occurrence of future events that are uncertain of occurring, we constrain the recognition of revenue until the uncertainty is resolved or the future event occurs. Generally, less than 5% of our Leasing revenue recognized in a period had previously been constrained. Capital Markets Capital Markets provides brokerage and other services for capital transactions, such as real estate sales or loan originations and refinancings. Our performance obligation is to facilitate the execution of capital transactions and we are generally entitled to the full consideration at the point in time upon which our performance obligation is satisfied, at which time we recognize revenue. Our mortgage banking and servicing operations - such as MSR-related activity, loan origination fees, and servicing income - are excluded from the scope of ASC Topic 606. Such out-of-scope revenue was $35.5 million and $101.8 million for the three and nine months ended September 30, 2018 , respectively, and $41.2 million and $91.9 million for the three and nine months ended September 30, 2017 , respectively. Property & Facility Management Property Management provides on-site day-to-day real estate management services for owners of office, industrial, retail, multifamily residential and various other types of properties, representing a series of daily performance obligations delivered over time. Pricing is generally in the form of a monthly management fee based upon property-level cash receipts, square footage under management or some other variable metric. Although we are principal in limited situations, we generally act as agent on behalf of our Property Management clients in relation to third-party vendors and subcontractors engaged to deliver operational services to our clients' properties. In these situations, we arrange, but do not control, the services provided by third-party vendors and subcontractors prior to the transfer of the services to the client. As a result, the costs incurred on behalf of clients, along with the corresponding revenue, are presented net on our Condensed Consolidated Statements of Comprehensive Income. Facilities Management primarily provides comprehensive, on-site day-to-day real estate management services to corporations and institutions across a broad range of industries that outsource the management of the real estate they occupy, representing a series of daily performance obligations delivered over time. Pricing generally includes a management fee and, in many instances, an incentive fee or other form of variable consideration. Although we may act as agent on behalf of our clients with respect to certain mandates, we generally act as principal for our Facilities Management contracts with respect to third-party vendors and subcontractors engaged to deliver operational services to our clients' facilities. In these situations, we control the services provided by such third-party vendors and subcontractors prior to the transfer of the services to the client. As a result, the costs incurred on behalf of our clients, along with the corresponding reimbursement revenue, are presented gross on our Condensed Consolidated Statements of Comprehensive Income. Project & Development Services Project & Development Services provides short-term construction-related services ranging from general contracting to project management for owners and occupiers of real estate. Depending on the terms of our engagement, our performance obligation is either to arrange for the completion of a project or to assume responsibility for completing a project on behalf of a client. Our obligations to clients are satisfied over time due to the continuous transfer of control of the underlying asset. Therefore, we recognize revenue over time, primarily using input measures (e.g. to-date costs incurred relative to total estimated costs at completion). Typically, we are entitled to consideration at distinct milestones over the term of an engagement. For certain contracts where we assume responsibility for completing a project, we control the services provided by third-party vendors and subcontractors prior to transfer of the assets to the client. In these situations, the costs incurred on behalf of clients, along with the associated reimbursement revenue are presented gross on our Condensed Consolidated Statements of Comprehensive Income. For situations in which we act as agent on behalf of clients, costs incurred and the associated revenue are presented net on our Condensed Consolidated Statements of Comprehensive Income. Advisory, Consulting and Other Advisory, Consulting and Other includes a variety of different service offerings, whereby our performance obligation is to provide services as specified in the contract. Occasionally, our entitlement to consideration is predicated on the occurrence of an event such as the delivery of a report for which client acceptance is required. However, except for event-driven point-in-time transactions, the majority of services provided within this service line are delivered over time due to the continuous transfer of control to our clients. LaSalle LaSalle provides real estate investment management services to clients and earns consideration in the form of advisory fees, transaction fees, and incentive fees. Typically, our performance obligation is to manage clients’ capital for a specified period of time and is delivered as a series of daily performance obligations over time. Revenue recognition for transaction and incentive fees is generally constrained until all contingencies have cleared due to the possibility of a significant reversal until completion of the events necessary to realize the associated consideration. Substantially all incentive fees recognized as revenue were previously constrained. Contract Assets - Contract assets include amounts recognized as revenue for which we are not yet entitled to payment for reasons other than the passage of time, but that do not constrain revenue recognition. As of September 30, 2018 and December 31, 2017 , we had $345.5 million and $236.0 million of contract assets, respectively, which are included in Short-term contract assets and Other assets on the Condensed Consolidated Balance Sheets. Contract Liabilities - Contract liabilities include advance payments related to performance obligations that have not yet been satisfied. As of September 30, 2018 and December 31, 2017 , we had $90.4 million and $73.7 million of contract liabilities, respectively, which are included in Short-term contract liabilities and deferred income on our Condensed Consolidated Balance Sheets. The majority of contract liabilities are recognized as revenue within 90 days. Deferred Income - Deferred income includes payments received from customers for which we have satisfied our performance obligations but are not yet able to recognize the related revenue because of contractual requirements. Remaining Performance Obligations - Remaining performance obligations represent the aggregate transaction price for contracts where our performance obligations have not yet been satisfied. As of September 30, 2018 , the aggregate amount of transaction price allocated to remaining performance obligations represented approximately 5% of our total revenue. In accordance with ASC Topic 606, excluded from the aforementioned remaining performance obligations are (i) amounts attributable to contracts expected to be completed within 12 months and (ii) variable consideration for services performed as a series of daily performance obligations, such as facilities management, property management, and LaSalle contracts. Contracts within these businesses represent a significant portion of our contracts with customers not expected to be completed within 12 months.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Business Segments	4. BUSINESS SEGMENTS We manage and report our operations as four business segments: The three geographic regions of RES including: (1) Americas, (2) Europe, Middle East and Africa ("EMEA"), and (3) Asia Pacific; and (4) LaSalle, which offers investment management services on a global basis. Each geographic region offers our full range of real estate services, including agency leasing and tenant representation, capital markets, property and facility management, project and development management, energy management and sustainability, construction management, and advisory, consulting and valuation services. LaSalle provides investment management services to institutional investors and high-net-worth individuals. Operating income represents total revenue less direct and allocated indirect expenses. We allocate all indirect expenses to our segments, other than interest and income taxes, as nearly all expenses incurred benefit one or more of the segments. Allocated expenses primarily consist of corporate global overhead, which we allocate to the business segments based on the budgeted operating expenses of each segment. For segment reporting, (a) gross contract costs and (b) net non-cash mortgage servicing rights ("MSR") and mortgage banking derivative activity are both excluded from revenue in determining "fee revenue". Gross contract costs are excluded from operating expenses in determining "fee-based operating expenses." Excluding these costs from revenue and expenses results in a net presentation which we believe more accurately reflects how we manage our expense base, operating margins, and performance. Refer to Results of Operations, included in Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations, for a full description of gross contract costs. In addition, our measure of segment results excludes Restructuring and acquisition charges. Effective January 1, 2018, management expanded the types of costs we include within gross contract costs. Most notably, this refinement includes the compensation and benefits associated with client-dedicated employees. Comparative periods were recast for consistency. This change in gross contract costs resulted in a decrease to fee revenue and was prompted by (i) the increase in compensation and benefits associated with client-dedicated personnel presented on a gross basis as a result of the adoption of ASC Topic 606 and (ii) the continued changes in our business mix, reflecting expansion of businesses that most commonly incorporate client-dedicated employees in the delivery of services. The most significant impacts are within Property & Facility Management and Project & Development Services. The Chief Operating Decision Maker of JLL measures and evaluates the segment results excluding (a) gross contract costs, (b) net non-cash MSR and mortgage banking derivative activity, and (c) Restructuring and acquisition charges. As of September 30, 2018 , we define the Chief Operating Decision Maker collectively as our Global Executive Board, which comprises the following: • Global Chief Executive Officer • Global Chief Executive Officer of Corporate Solutions • Global Chief Financial Officer • Global Chief Executive Officer of Capital Markets • Chief Executive Officers of each of our four business segments • Global Chief Administrative Officer Summarized financial information by business segment is as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Americas - Real Estate Services Leasing $ 424.0 370.1 $ 1,151.4 1,057.5 Capital Markets 115.6 115.4 344.4 319.2 Property & Facility Management 1,271.5 1,077.0 3,713.4 3,230.7 Project & Development Services 304.7 288.2 848.8 843.7 Advisory, Consulting and Other 85.8 69.9 237.1 201.9 Revenue 2,201.6 1,920.6 6,295.1 5,653.0 Reimbursements (1,251.5 ) (1,094.9 ) (3,659.6 ) (3,283.4 ) Revenue before reimbursements 950.1 825.7 2,635.5 2,369.6 Gross contract costs (170.7 ) (124.9 ) (460.4 ) (387.1 ) Net non-cash MSR and mortgage banking derivative activity (5.3 ) (7.1 ) (9.3 ) (11.1 ) Fee revenue 774.1 693.7 2,165.8 1,971.4 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 821.2 710.2 2,306.8 2,078.2 Depreciation and amortization 24.5 24.2 77.1 71.4 Segment operating expenses, excluding reimbursed expenses 845.7 734.4 2,383.9 2,149.6 Gross contract costs (170.7 ) (124.9 ) (460.4 ) (387.1 ) Fee-based segment operating expenses 675.0 609.5 1,923.5 1,762.5 Segment operating income $ 104.4 91.3 $ 251.6 220.0 Equity earnings 0.1 0.1 0.6 0.5 Segment income $ 104.5 91.4 $ 252.2 220.5 EMEA - Real Estate Services Leasing $ 80.1 71.0 $ 211.9 186.6 Capital Markets 108.9 107.2 288.1 263.7 Property & Facility Management 336.3 335.9 1,078.9 975.0 Project & Development Services 220.1 170.3 663.5 472.0 Advisory, Consulting and Other 60.2 65.6 193.4 177.1 Revenue 805.6 750.0 2,435.8 2,074.4 Reimbursements (171.0 ) (108.5 ) (480.0 ) (335.9 ) Revenue before reimbursements 634.6 641.5 1,955.8 1,738.5 Gross contract costs (237.9 ) (258.9 ) (820.4 ) (739.2 ) Fee revenue 396.7 382.6 1,135.4 999.3 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 611.7 625.9 1,931.4 1,723.5 Depreciation and amortization 11.8 11.6 34.7 33.0 Segment operating expenses, excluding reimbursed expenses 623.5 637.5 1,966.1 1,756.5 Gross contract costs (237.9 ) (258.9 ) (820.4 ) (739.2 ) Fee-based segment operating expenses 385.6 378.6 1,145.7 1,017.3 Segment operating income (loss) $ 11.1 4.0 $ (10.3 ) (18.0 ) Equity earnings — — — — Segment income (loss) $ 11.1 4.0 $ (10.3 ) (18.0 ) Continued: Summarized financial information by business segment is as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Asia Pacific - Real Estate Services Leasing $ 69.3 51.9 $ 165.2 133.7 Capital Markets 39.5 55.7 122.2 121.5 Property & Facility Management 529.2 490.0 1,590.6 1,449.4 Project & Development Services 108.7 109.5 309.8 297.4 Advisory, Consulting and Other 43.3 42.3 126.4 117.4 Revenue 790.0 749.4 2,314.2 2,119.4 Reimbursements (330.0 ) (333.5 ) (1,007.8 ) (1,005.9 ) Revenue before reimbursements 460.0 415.9 1,306.4 1,113.5 Gross contract costs (207.7 ) (169.1 ) (608.4 ) (462.5 ) Fee revenue 252.3 246.8 698.0 651.0 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 432.6 386.5 1,245.1 1,047.2 Depreciation and amortization 5.6 5.2 17.0 15.7 Segment operating expenses, excluding reimbursed expenses 438.2 391.7 1,262.1 1,062.9 Gross contract costs (207.7 ) (169.1 ) (608.4 ) (462.5 ) Fee-based segment operating expenses 230.5 222.6 653.7 600.4 Segment operating income $ 21.8 24.2 $ 44.3 50.6 Equity earnings 1.0 0.9 2.0 2.3 Segment income $ 22.8 25.1 $ 46.3 52.9 LaSalle Advisory fees $ 68.0 63.4 $ 205.0 190.0 Transaction fees & other 9.8 5.6 33.2 24.9 Incentive fees 94.8 33.2 145.4 48.5 Revenue 172.6 102.2 383.6 263.4 Reimbursements (3.6 ) (4.6 ) (13.2 ) (13.5 ) Revenue before reimbursements 169.0 97.6 370.4 249.9 Gross contract costs (0.7 ) (1.2 ) (3.2 ) (3.8 ) Fee revenue 168.3 96.4 367.2 246.1 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 110.9 75.1 265.9 203.0 Depreciation and amortization 0.8 0.8 2.3 2.2 Segment operating expenses, excluding reimbursed expenses 111.7 75.9 268.2 205.2 Gross contract costs (0.7 ) (1.2 ) (3.2 ) (3.8 ) Fee-based segment operating expenses 111.0 74.7 265.0 201.4 Segment operating income $ 57.3 21.7 $ 102.2 44.7 Equity earnings 2.3 11.6 24.6 29.9 Segment income $ 59.6 33.3 $ 126.8 74.6 Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Segment Reconciling Items Fee revenue $ 1,591.4 1,419.5 $ 4,366.4 3,867.8 Gross contract costs 617.0 554.1 1,892.4 1,592.6 Net non-cash MSR and mortgage banking derivative activity 5.3 7.1 9.3 11.1 Revenue before reimbursements 2,213.7 1,980.7 6,268.1 5,471.5 Reimbursements 1,756.1 1,541.5 5,160.6 4,638.7 Revenue $ 3,969.8 3,522.2 $ 11,428.7 10,110.2 Total segment operating expenses, excluding reimbursed expenses & before restructuring and acquisition charges $ 2,019.1 1,839.5 $ 5,880.3 5,174.2 Reimbursed expenses 1,756.1 1,541.5 5,160.6 4,638.7 Total segment operating expenses before restructuring and acquisition charges $ 3,775.2 3,381.0 $ 11,040.9 9,812.9 Operating income before restructuring and acquisition charges $ 194.6 141.2 $ 387.8 297.3 Restructuring and acquisition charges (credits) 3.7 3.4 (6.7 ) 13.3 Operating income $ 190.9 137.8 $ 394.5 284.0 The following table reconciles segment identifiable assets to consolidated amounts. (in millions) September 30, 2018 December 31, 2017 Real Estate Services: Americas $ 5,292.8 4,745.4 EMEA 2,168.3 2,367.5 Asia Pacific 1,287.9 1,305.0 LaSalle 584.3 548.6 Corporate 285.8 287.9 Consolidated $ 9,619.1 9,254.4

Business Combinations, Goodwill

Business Combinations, Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2018
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Business Combinations, Goodwill and Other Intangible Assets	5. BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS 2018 Business Combinations Activity Aggregate terms of our acquisitions included: (1) cash paid at closing of $31.7 million , (2) guaranteed deferred consideration of $1.9 million , and (3) contingent earn-out consideration of $2.7 million , which we will pay upon satisfaction of certain performance conditions and which we have initially recorded at their respective acquisition date fair value. A preliminary allocation of purchase consideration resulted in goodwill of $30.1 million , identifiable intangibles of $5.7 million , and other net assets (acquired assets less assumed liabilities) of $0.5 million . As of September 30, 2018 , we have not completed our analysis to assign fair values to all of the identifiable intangible and tangible assets acquired and, therefore, we may further refine the purchase price allocations for our 2018 acquisitions during their open measurement periods. During the nine months ended September 30, 2018 , we paid $63.3 million for deferred business acquisition and earn-out obligations for acquisitions completed in prior years. We also paid $1.5 million to acquire the final portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB, a Swedish real estate services provider. Within the 2018 acquisition activity, we completed four new strategic acquisitions, expanding our capabilities and increasing our presence in key regional markets. These strategic acquisitions are presented below. Acquired Company Quarter of Acquisition Country Primary Service Line Stessa Inc. Q1 United States Advisory, Consulting and Other Raymond Chabot Grant Thornton & Co. LLP Q1 Canada Advisory, Consulting and Other JCL International Inc. Q1 Philippines Project & Development Services Northwest Atlantic Q3 Canada Leasing 2017 Business Combination Activity During the nine months ended September 30, 2018 , we made no adjustments to our preliminary allocation of the purchase consideration for certain acquisitions completed in 2017. As of September 30, 2018 , we have completed our analysis to assign fair values to all the identifiable intangible and tangible assets acquired for our 2017 acquisitions. Earn-Out Payments ($ in millions) September 30, 2018 December 31, 2017 Number of acquisitions with earn-out payments subject to the achievement of certain performance criteria 55 56 Maximum earn-out payments (undiscounted) $ 382.9 436.2 Short-term earn-out liabilities (fair value) 1 32.6 49.6 Long-term earn-out liabilities (fair value) 1 130.7 177.5 1 Included in Short-term and Long-term acquisition obligations on the Condensed Consolidated Balance Sheets Assuming the achievement of the applicable performance criteria, we anticipate making these earn-out payments over the next six years. Refer to Note 8, Fair Value Measurements, and Note 11, Restructuring and Acquisition Charges, for additional discussion of our earn-out liabilities. Goodwill and Other Intangible Assets Goodwill and unamortized intangibles as of September 30, 2018 consisted of: (1) goodwill of $2,689.7 million , (2) identifiable intangibles of $282.7 million amortized over their remaining finite useful lives, and (3) $8.8 million of identifiable intangibles with indefinite useful lives that are not amortized. Significant portions of our goodwill and unamortized intangibles are denominated in currencies other than the U.S. dollar, which means a portion of the movements in the reported book value of these balances is attributable to movements in foreign currency exchange rates. The following tables detail, by reporting segment, movements in goodwill. Real Estate Services (in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of December 31, 2017 $ 1,412.2 957.6 323.0 16.5 $ 2,709.3 Additions, net of adjustments 21.0 — 9.1 — 30.1 Impact of exchange rate movements (0.5 ) (39.5 ) (9.2 ) (0.5 ) (49.7 ) Balance as of September 30, 2018 $ 1,432.7 918.1 322.9 16.0 $ 2,689.7 Real Estate Services (in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of December 31, 2016 $ 1,406.1 851.7 306.1 15.4 $ 2,579.3 Additions, net of adjustments 5.2 17.9 6.5 — 29.6 Impact of exchange rate movements 0.9 80.5 10.0 1.0 92.4 Balance as of September 30, 2017 $ 1,412.2 950.1 322.6 16.4 $ 2,701.3 The following tables detail, by reporting segment, movements in the gross carrying amount and accumulated amortization of our identifiable intangibles. MSRs Other Intangibles (in millions) Americas Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of December 31, 2017 $ 241.8 117.0 88.8 23.3 — $ 470.9 Additions, net of adjustments (1) 36.8 3.6 — 2.1 — 42.5 Adjustment for fully amortized intangibles (17.2 ) (36.2 ) (1.7 ) (0.7 ) — (55.8 ) Impact of exchange rate movements — 0.3 (3.3 ) (2.0 ) — (5.0 ) Balance as of September 30, 2018 $ 261.4 84.7 83.8 22.7 — $ 452.6 Accumulated Amortization Balance as of December 31, 2017 $ (55.1 ) (61.3 ) (43.1 ) (6.4 ) — $ (165.9 ) Amortization, net (2) (32.2 ) (10.2 ) (9.5 ) (1.9 ) — (53.8 ) Adjustment for fully amortized intangibles 17.2 36.2 1.7 0.7 — 55.8 Impact of exchange rate movements — — 1.8 1.0 — 2.8 Balance as of September 30, 2018 $ (70.1 ) (35.3 ) (49.1 ) (6.6 ) — $ (161.1 ) Net book value as of September 30, 2018 $ 191.3 49.4 34.7 16.1 — $ 291.5 (1) Included in this amount for MSRs was $8.7 million relating to prepayments/write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. (2) Amortization of MSRs is included in Revenue before reimbursements within the Condensed Consolidated Statements of Comprehensive Income. MSRs Other Intangibles (in millions) Americas Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of December 31, 2016 $ 193.1 167.1 91.1 24.2 0.1 $ 475.6 Additions, net of adjustments (1) 50.7 0.4 3.1 5.8 — 60.0 Adjustment for fully amortized intangibles (12.5 ) (50.0 ) (7.7 ) (8.0 ) (0.1 ) (78.3 ) Impact of exchange rate movements — 0.2 7.6 1.3 — 9.1 Balance as of September 30, 2017 $ 231.3 117.7 94.1 23.3 — $ 466.4 Accumulated Amortization Balance as of December 31, 2016 $ (32.3 ) (98.7 ) (38.0 ) (11.5 ) (0.1 ) $ (180.6 ) Amortization, net (2) (29.8 ) (10.3 ) (11.2 ) (1.9 ) — (53.2 ) Adjustment for fully amortized intangibles 12.5 50.0 7.7 8.0 0.1 78.3 Impact of exchange rate movements — 0.3 (3.6 ) (0.2 ) — (3.5 ) Balance as of September 30, 2017 $ (49.6 ) (58.7 ) (45.1 ) (5.6 ) — $ (159.0 ) Net book value as of September 30, 2017 $ 181.7 59.0 49.0 17.7 — $ 307.4 (1) Included in this amount for MSRs was $7.7 million relating to prepayments/write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. (2) Amortization of MSRs is included in Revenue before reimbursements within the Condensed Consolidated Statements of Comprehensive Income. The remaining estimated future amortization expense of MSRs and other identifiable intangible assets, by year, as of September 30, 2018 , is presented in the following table. (in millions) MSRs Other Intangibles Total 2018 (3 months) $ 6.7 9.7 $ 16.4 2019 30.3 23.7 54.0 2020 28.4 19.2 47.6 2021 25.4 12.4 37.8 2022 22.5 6.5 29.0 2023 19.1 4.3 23.4 Thereafter 58.9 15.6 74.5 Total $ 191.3 91.4 $ 282.7

Investments in Real Estate Vent

Investments in Real Estate Ventures	9 Months Ended
	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investments in Real Estate Ventures	6. INVESTMENTS IN REAL ESTATE VENTURES As of September 30, 2018 and December 31, 2017 , we had Investments in real estate ventures of $371.5 million and $376.2 million , respectively. Approximately 75% of our investments are in 45 separate property or commingled funds, where we co-invest alongside our clients and for which we also have an advisory agreement. Our investment ownership percentages in these funds generally range from less than 1% to 10% . The remaining 25% of our Investments in real estate ventures, as of September 30, 2018 , were attributable to investment vehicles that use our capital and outside capital primarily provided by institutional investors to invest in certain real estate ventures that own and operate real estate. Of our investments attributable to investment vehicles, the majority was invested in LaSalle Investment Company II ("LIC II"), in which we held an effective ownership interest of 48.78% . We have maximum potential unfunded commitments to direct investments or investment vehicles of $212.5 million as of September 30, 2018 , of which $60.4 million relates to our commitment to LIC II. We evaluate our less-than-wholly-owned investments to determine whether the underlying entities are classified as variable interest entities ("VIEs"); we assess each identified VIE to determine whether we are the primary beneficiary. We have determined that we are the primary beneficiary of certain VIEs and accordingly, we have consolidated such entities. The assets of the consolidated VIEs are available only for the settlement of the obligations of the respective entities and the mortgage loans of the consolidated VIEs are non-recourse to JLL. Summarized financial information for our consolidated VIEs is presented in the following tables. (in millions) September 30, 2018 December 31, 2017 Property and equipment, net $ 36.6 15.7 Investments in real estate ventures 13.9 12.6 Other assets (1) 11.1 44.4 Total assets $ 61.6 72.7 Other current liabilities (1) $ 1.0 30.9 Mortgage indebtedness (included in Other liabilities) 26.0 9.2 Total liabilities 27.0 40.1 Members' equity (included in Noncontrolling interest) 34.6 32.6 Total liabilities and members' equity $ 61.6 72.7 (1) Balances as of December 31, 2017, primarily represent investment properties and their corresponding liabilities, classified as held for sale. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Revenue $ 1.6 1.8 $ 4.3 4.4 Operating and other expenses (1.4 ) (1.6 ) (3.8 ) (3.6 ) Net gains on sale of investments — — 2.0 — Net income $ 0.2 0.2 $ 2.5 0.8 We allocate the members' equity and net income of the consolidated VIEs to the noncontrolling interest holders as Noncontrolling interest on our Condensed Consolidated Balance Sheets and as Net income attributable to noncontrolling interest in our Condensed Consolidated Statements of Comprehensive Income, respectively. Impairment There were no significant other-than-temporary impairment charges on Investments in real estate ventures for the nine months ended September 30, 2018 and 2017 . Fair Value We report a majority of our investments in real estate ventures at fair value. For such investments, we increase or decrease our investment each reporting period by the change in the fair value and we report these fair value adjustments in our Condensed Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. The table below shows the movement in our investments in real estate ventures reported at fair value. (in millions) 2018 2017 Fair value investments as of January 1, $ 242.3 212.7 Investments 27.7 21.2 Distributions (31.0 ) (22.5 ) Change in fair value 8.2 17.9 Foreign currency translation adjustments, net (1.2 ) 4.9 Fair value investments as of September 30, $ 246.0 234.2

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	7. STOCK-BASED COMPENSATION Stock Unit Awards Along with cash-based salaries and performance-based annual cash incentive awards, stock unit awards represent an important element of compensation to our employees. During the second quarter of 2018, we issued performance stock unit ("PSU") awards to certain employees under the Jones Lang LaSalle 2017 Stock Award and Incentive Plan, a supplement to the continued issuance of restricted stock unit ("RSU") awards. RSU and PSU activity is presented in the following tables. Shares (thousands) Weighted Average Weighted Average Unvested as of June 30, 2018 750.3 $ 131.09 2.36 Granted 5.8 144.43 Vested (81.2 ) 123.08 Forfeited (35.5 ) 136.07 Unvested as of September 30, 2018 639.4 $ 131.93 2.21 Unvested as of June 30, 2017 775.9 $ 117.74 1.61 Granted 5.1 115.47 Vested (70.9 ) 112.64 Forfeited (0.8 ) 130.32 Unvested as of September 30, 2017 709.3 $ 118.22 1.43 Shares (thousands) Weighted Average Weighted Average Remaining (in years) Unvested as of December 31, 2017 727.7 $ 118.96 1.24 Granted 225.8 161.87 Vested (259.3 ) 122.63 Forfeited (54.8 ) 132.64 Unvested as of September 30, 2018 639.4 $ 131.93 2.21 Unvested as of December 31, 2016 750.9 $ 113.97 1.71 Granted 157.0 116.50 Vested (177.3 ) 99.24 Forfeited (21.3 ) 113.18 Unvested as of September 30, 2017 709.3 $ 118.22 1.43 We determine the fair value of RSUs, subject only to service requirements, based on the closing market price of our common stock on the grant date. PSUs are subject to service requirements and one or more performance measures, including (i) performance conditions (e.g. achievement against earnings per share targets) and (ii) for certain awards, a market condition (e.g. total shareholder return performance against a peer group). We determine the fair value of PSUs based on the closing market price of our common stock on the grant date taking into consideration the likelihood of achieving each performance condition and the market condition valuation, as applicable, based on the output of a Monte Carlo simulation. As of September 30, 2018 , we had $34.7 million of unamortized deferred compensation related to unvested restricted stock units, which we anticipate recognizing over varying periods into 2022 .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. FAIR VALUE MEASUREMENTS We measure certain assets and liabilities in accordance with ASC 820, Fair Value Measurements and Disclosures , which defines fair value as the price that would be received for an asset, or paid to transfer a liability, in an orderly transaction between market participants on the measurement date. In addition, it establishes a framework for measuring fair value according to the following three-tier fair value hierarchy: • Level 1 - Quoted prices for identical assets or liabilities in active markets accessible as of the measurement date; • Level 2 - Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 - Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. We had no transfers among levels of the fair value hierarchy during the nine months ended September 30, 2018 and 2017 . Our policy is to recognize transfers at the end of quarterly reporting periods. Financial Instruments Our financial instruments include Cash and cash equivalents, Trade receivables, Notes and other receivables, Reimbursable receivables, Warehouse receivables, restricted cash, contract assets, Accounts payable, Reimbursable payables, Short-term borrowings, contract liabilities, Warehouse facilities, Credit facility, Long-term debt, and foreign currency forward contracts. The carrying amounts of Cash and cash equivalents, Trade receivables, Notes and other receivables, Reimbursable receivables, restricted cash, contract assets, Accounts payable, Reimbursable payables, contract liabilities, and the Warehouse facilities approximate their estimated fair values due to the short-term nature of these instruments. The carrying values of our Credit facility and Short-term borrowings approximate their estimated fair values given the variable interest rate terms and market spreads. We estimated the fair value of our Long-term debt as $686.2 million and $712.6 million as of September 30, 2018 and December 31, 2017 , respectively, using dealer quotes that are Level 2 inputs in the fair value hierarchy. The carrying value of our Long-term debt was $677.3 million and $690.6 million as of September 30, 2018 and December 31, 2017 , respectively, and included debt issuance costs of $3.9 million and $4.3 million , respectively. Investments in Real Estate Ventures at Fair Value - Net Asset Value ("NAV") We report a majority of our investments in real estate ventures at fair value. For such investments, we increase or decrease our investment each reporting period by the change in the fair value and we report these fair value adjustments in our Condensed Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. Of our investments reported at fair value, we generally estimate the fair value using the NAV per share (or its equivalent) our investees provide. Critical inputs to NAV estimates included valuations of the underlying real estate assets and borrowings, which incorporate investment-specific assumptions such as discount rates, capitalization rates, rental and expense growth rates, and asset-specific market borrowing rates. We did not consider adjustments to NAV estimates provided by investees, including adjustments for any restrictions to the transferability of ownership interests embedded within investment agreements to which we are a party, to be necessary based upon (1) our understanding of the methodology utilized and inputs incorporated to estimate NAV at the investee level derived through LaSalle's role as advisor or manager of these ventures, (2) consideration of market demand for the specific types of real estate assets held by each venture, and (3) contemplation of real estate and capital markets conditions in the localities in which these ventures operate. As of September 30, 2018 and December 31, 2017 , investments in real estate ventures at fair value using NAV were $203.6 million and $195.0 million , respectively. As these investments are not required to be classified in the fair value hierarchy, they have been excluded from the following table. Recurring Fair Value Measurements The following table categorizes by level in the fair value hierarchy the estimated fair value of our assets and liabilities measured at fair value on a recurring basis. September 30, 2018 December 31, 2017 (in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Investments in real estate ventures - fair value $ 42.4 — — 47.3 — — Foreign currency forward contracts receivable — 5.8 — — 13.2 — Warehouse receivables — 617.7 — — 317.5 — Deferred compensation plan assets — 277.8 — — 229.7 — Mortgage banking derivative assets — — 47.2 — — 19.0 Total assets at fair value $ 42.4 901.3 47.2 47.3 560.4 19.0 Liabilities Foreign currency forward contracts payable $ — 3.7 — — 1.9 — Deferred compensation plan liabilities — 268.3 — — 228.4 — Earn-out liabilities — — 163.3 — — 227.1 Mortgage banking derivative liabilities — — 28.5 — — 10.3 Total liabilities at fair value $ — 272.0 191.8 — 230.3 237.4 Investments in Real Estate Ventures We classify one investment as Level 1 in the fair value hierarchy as quoted prices are readily available. We increase or decrease our investment each reporting period by the change in the fair value of the investment. We report these fair value adjustments in our Condensed Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. Foreign Currency Forward Contracts We regularly use foreign currency forward contracts to manage our currency exchange rate risk related to intercompany lending and cash management practices. These contracts are on our Condensed Consolidated Balance Sheets as current assets and current liabilities. We determine the fair values of these contracts based on current market rates. The inputs for these valuations are Level 2 inputs in the fair value hierarchy. As of September 30, 2018 and December 31, 2017 , these contracts had a gross notional value of $2.07 billion ( $0.91 billion on a net basis) and $2.43 billion ( $1.82 billion on a net basis), respectively. We recognize gains and losses from revaluation of these contracts as a component of Operating, administrative and other expense. They are offset by the gains and losses we recognize on the revaluation of intercompany loans and other foreign currency balances. The impact to net income was not significant for either of the three or nine months ended September 30, 2018 or 2017 . We record the asset and liability positions for our foreign currency forward contracts based on the net payable or net receivable position with the financial institutions from which we purchase these contracts. The $5.8 million asset as of September 30, 2018 , was composed of gross contracts with receivable positions of $7.5 million and payable positions of $1.7 million . The $3.7 million liability as of September 30, 2018 , was composed of gross contracts with receivable positions of $1.1 million and payable positions of $4.8 million . As of December 31, 2017 , the $13.2 million asset was composed of gross contracts with receivable positions of $14.4 million and payable positions of $1.2 million . The $1.9 million liability as of December 31, 2017 , was composed of gross contracts with receivable positions of $2.3 million and payable positions of $4.2 million . Warehouse Receivables The fair value of the Warehouse receivables is based on already locked-in security-buy prices. As of September 30, 2018 and December 31, 2017 , all of our Warehouse receivables included in our Condensed Consolidated Balance Sheet were under commitment to be purchased by government-sponsored enterprises ("GSEs") or by a qualifying investor as part of a U.S. government or GSE mortgage-backed security program. The Warehouse receivables are classified as Level 2 in the fair value hierarchy as all significant inputs are readily observable. Deferred Compensation Plan We maintain a deferred compensation plan for certain of our U.S. employees that allows them to defer portions of their compensation. We invest directly in insurance contracts which yield returns to fund these deferred compensation obligations. We recognize an asset for the amount that could be realized under these insurance contracts as of the balance sheet date, and we adjust the deferred compensation obligation to reflect the changes in the fair value of the amount owed to the employees. The inputs for this valuation are Level 2 inputs in the fair value hierarchy. We recorded this plan on our Condensed Consolidated Balance Sheet as of September 30, 2018 , as Deferred compensation plan assets of $277.8 million , long-term deferred compensation plan liabilities of $268.3 million , included in Deferred compensation, and as a reduction of equity, Shares held in trust, of $6.0 million . We recorded this plan on our Condensed Consolidated Balance Sheet as of December 31, 2017 , as Deferred compensation plan assets of $229.7 million , long-term deferred compensation plan liabilities of $228.4 million , included in Deferred compensation, and as a reduction of equity, Shares held in trust, of $5.9 million . Earn-Out Liabilities We classify our earn-out liabilities within Level 3 in the fair value hierarchy because the inputs we use to develop the estimated fair value include unobservable inputs. We base the fair value of our earn-out liabilities on the present value of probability-weighted future cash flows related to the earn-out performance criteria on each reporting date. We determine the probability of achievement we assign to the performance criteria based on the due diligence we performed at the time of acquisition as well as actual performance achieved subsequent to acquisition. An increase to the probability of achievement would result in a higher fair value measurement. See Note 5, Business Combinations, Goodwill and Intangibles, for additional discussion of our earn-out liabilities. Mortgage Banking Derivatives The fair value of our rate lock commitments to prospective borrowers and the related inputs primarily include, as applicable, the expected net cash flows associated with closing and servicing the loan and the effects of interest rate movements between the date of the interest rate lock commitment ("IRLC") and the balance sheet date based on applicable published U.S. Treasury rates. The fair value of our forward sales contracts with prospective investors considers the market price movement of a similar security between the trade date and the balance sheet date. The market price changes are multiplied by the notional amount of the forward sales contracts to measure the fair value. Both the rate lock commitments to prospective borrowers and the forward sale contracts with prospective investors are undesignated derivatives and considered Level 3 valuations due to significant unobservable inputs related to counterparty credit risk. An increase in counterparty credit risk assumptions would result in a lower fair value measurement. The fair valuation is determined using discounted cash flow techniques, and the derivatives are marked to fair value through Revenue before reimbursements in the Condensed Consolidated Statements on Comprehensive Income. The tables below present a reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). (in millions) Balance as of June 30, 2018 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements 2 Balance as of September 30, 2018 Mortgage banking derivative assets and liabilities, net $ 8.1 8.0 — 18.7 (16.1 ) $ 18.7 Earn-out liabilities 179.6 (2.7 ) (1.1 ) 1.1 (13.6 ) 163.3 (in millions) Balance as of June 30, 2017 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements Balance as of September 30, 2017 Mortgage banking derivative assets and liabilities, net $ 14.1 3.4 — 25.5 (31.5 ) $ 11.5 Earn-out liabilities 225.6 (0.6 ) 2.9 0.7 (5.1 ) 223.5 (in millions) Balance as of December 31, 2017 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements 2 Balance as of September 30, 2018 Mortgage banking derivative assets and liabilities, net $ 8.7 4.6 — 53.4 (48.0 ) $ 18.7 Earn-out liabilities 227.1 (17.5 ) (3.6 ) 2.7 (45.4 ) 163.3 (in millions) Balance as of December 31, 2016 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements Balance as of September 30, 2017 Mortgage banking derivative assets and liabilities, net $ 15.5 11.8 — 56.6 (72.4 ) $ 11.5 Earn-out liabilities 229.6 (2.7 ) 7.4 11.4 (22.2 ) 223.5 1 CTA: Currency translation adjustments 2 In the third quarter of 2018, earn-out liabilities of $9.1 million were reclassified to guaranteed deferred acquisition obligations. Net change in fair value, included in the tables above, is reported in Net income as follows. Category of Assets/Liabilities using Unobservable Inputs Condensed Consolidated Statements of Comprehensive Income Account Caption Earn-out liabilities (Short-term and Long-term) Restructuring and acquisition charges Other current assets - Mortgage banking derivative assets Revenue before reimbursements Other current liabilities - Mortgage banking derivative liabilities Revenue before reimbursements Non-Recurring Fair Value Measurements We review our investments in real estate ventures, except those investments otherwise reported at fair value, on a quarterly basis, or as otherwise deemed necessary, for indications of whether we may be unable to recover the carrying value of our investments and whether such investments are other-than-temporarily impaired. When the carrying amount of the investment is in excess of the estimated future undiscounted cash flows, we use a discounted cash flow approach or other acceptable method to determine the fair value of the investment in computing the amount of the impairment. Our determination of fair value primarily relies on Level 3 inputs. We did not recognize any significant investment-level impairment losses during either of the three or nine months ended September 30, 2018 or 2017 . See Note 6, Investments in Real Estate Ventures, for additional information, including information related to impairment charges recorded at the investee level.

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	9. DEBT Short-term borrowings and long-term debt obligations are composed of the following. (in millions) September 30, 2018 December 31, 2017 Short-term borrowings: Local overdraft facilities $ 35.4 45.4 Other short-term borrowings 48.3 32.0 Total short-term borrowings $ 83.7 77.4 Credit facility, net of debt issuance costs of $16.8 and $15.3 223.2 (15.3 ) Long-term senior notes, 4.4%, face amount of $275.0, due November 2022, net of debt issuance costs of $1.7 and $2.0 273.3 273.0 Long-term senior notes, 1.96%, face amount of €175.0, due June 2027, net of debt issuance costs of $1.1 and $1.2 202.0 208.8 Long-term senior notes, 2.21%, face amount of €175.0, due June 2029, net of debt issuance costs of $1.1 and $1.1 202.0 208.8 Total debt $ 984.2 752.7 Credit Facility On May 17, 2018, we amended our $2.75 billion unsecured revolving credit facility (the "Facility"), which improved pricing and extended the maturity date from June 21, 2021 to May 17, 2023 . Pricing on the Facility ranges from LIBOR plus 0.875% to 1.35% , with pricing as of September 30, 2018 , at LIBOR plus 1.00% . In addition to outstanding borrowings under the Facility presented in the above table, we had outstanding letters of credit under the Facility of $8.6 million and $9.0 million as of September 30, 2018 and December 31, 2017 , respectively. The following tables provides additional information on our Facility. Three Months Ended September 30, Nine Months Ended September 30, ($ in millions) 2018 2017 2018 2017 Average outstanding borrowings under the Facility $ 461.5 712.3 $ 396.5 1,042.7 Effective interest rate on the Facility 3.0 % 2.3 % 2.8 % 2.0 % We will continue to use the Facility for, but not limited to, business acquisitions, working capital needs (including payment of accrued incentive compensation), co-investment activities, dividend payments, share repurchases and capital expenditures. Short-Term Borrowings and Long-Term Debt In addition to our Facility, we have the capacity to borrow up to an additional $61.5 million under local overdraft facilities. Amounts outstanding are presented in the debt table above. As of September 30, 2018 , our issuer and senior unsecured ratings are investment grade: BBB+ (stable outlook) from Standard & Poor’s Ratings Services and Baa1 (stable outlook) from Moody’s Investors Service, Inc. Covenants Our Facility and senior notes are subject to customary financial and other covenants, including cash interest coverage ratios and leverage ratios, as well as event of default conditions. We remained in compliance with all covenants as of September 30, 2018 . Warehouse Facilities September 30, 2018 December 31, 2017 ($ in millions) Outstanding Balance Maximum Capacity Outstanding Balance Maximum Capacity Warehouse Facilities: LIBOR plus 1.3%, expires September 23, 2019 1 $ 292.5 375.0 156.4 375.0 LIBOR plus 1.25%, expires September 20, 2019 2 226.3 775.0 74.8 375.0 LIBOR plus 1.3%, expires August 31, 2019 3 54.0 100.0 — 100.0 Fannie Mae ASAP program, LIBOR plus 1.30% to 1.45% 40.7 n/a 79.2 n/a Gross warehouse facilities $ 613.5 1,250.0 310.4 850.0 Debt issuance costs (1.6 ) n/a (1.2 ) n/a Total warehouse facilities $ 611.9 1,250.0 309.2 850.0 1 In the third quarter of 2018, JLL extended the Warehouse facility; previously, the facility had a maturity date of September 29, 2018. 2 In the third quarter of 2018, JLL extended the Warehouse facility, increased the maximum capacity, and negotiated a decrease to the interest rate; previously, the facility had a maturity date of September 24, 2018, a maximum capacity of $375.0 million , and an interest rate of LIBOR plus 1.35%. 3 In the third quarter of 2018, JLL extended the Warehouse facility and negotiated a decrease to the interest rate; previously, the facility had a maturity date of August 31, 2018 and an interest rate of LIBOR plus 1.5%. We have lines of credit established for the sole purpose of funding our Warehouse receivables. These lines of credit exist with financial institutions and are secured by the related warehouse receivables. Pursuant to these warehouse facilities, we are required to comply with certain financial covenants regarding (1) minimum net worth, (2) minimum servicing-related loans, and (3) minimum adjusted leverage ratios. We remained in compliance with all covenants under our Warehouse facilities as of September 30, 2018 . As a supplement to our lines of credit, we have an uncommitted facility with Fannie Mae under its As Soon As Pooled ("ASAP") funding program. After origination, we sell certain warehouse receivables to Fannie Mae; the proceeds are used to repay the original lines of credit used to fund the loan. The ASAP funding program requires us to repurchase these loans, generally within 45 days, followed by an immediate, ultimate, sale back to Fannie Mae. The difference between the price paid upon the original sale to Fannie Mae and the ultimate sale reflects borrowing costs.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. COMMITMENTS AND CONTINGENCIES We are a defendant in various litigation matters arising in the ordinary course of business, some of which involve claims for damages that are substantial in amount. Many of these litigation matters are covered by insurance (including insurance provided through a consolidated captive insurance company as further discussed below), but they may nevertheless be subject to large deductibles and the amounts being claimed may exceed the available insurance. Although we cannot determine the ultimate liability for these matters, based upon information currently available, we believe the ultimate resolution of such claims and litigation will not have a material adverse effect on our financial position, results of operations or liquidity. In order to better manage our global insurance program and support our risk management efforts, we supplement our traditional insurance coverage for certain types of claims by using a wholly-owned captive insurance company. The level of risk retained by our captive insurance company, with respect to professional indemnity claims, is up to $2.5 million per claim, inclusive of the deductible. We contract third-party insurance companies to provide coverage of risk in excess of this amount. When a potential loss event occurs, we estimate the ultimate cost of the claim and accrue the amount in Other current and long-term liabilities on our Condensed Consolidated Balance Sheets when probable and estimable. In addition, we have established receivables from third-party insurance providers for claim amounts in excess of the risk retained by our captive insurance company. In total, these receivables were $32.1 million and $22.0 million as of September 30, 2018 and December 31, 2017 , respectively, and are included in Notes and other receivables and Long-term receivables on our Condensed Consolidated Balance Sheets. The following table shows the professional indemnity accrual activity and related payments. (in millions) December 31, 2017 $ 26.7 New claims 2.3 Prior year claims adjustments 12.3 Claims paid (7.3 ) September 30, 2018 $ 34.0 December 31, 2016 $ 7.3 New claims 0.7 Prior year claims adjustments 1.5 Claims paid (3.0 ) September 30, 2017 $ 6.5 As a lender in the Fannie Mae Delegated Underwriting and Servicing ("DUS") program, we retain a portion of the risk of loss for loans we originate and sell under the DUS program. The net loss on defaulted loans are shared with Fannie Mae based upon established loss-sharing ratios. Generally, our share of losses is capped at 20% of the principal balance of the mortgage at origination. As of September 30, 2018 and December 31, 2017 , we had loans, funded and sold, subject to such loss-sharing arrangements with an aggregate unpaid principal balance of $8.4 billion and $8.0 billion , respectively. For all DUS program loans with loss-sharing obligations, we record a loan loss accrual equal to the estimated fair value of the guarantee obligations undertaken upon sale of the loan, which reduces our gain on sale of the loan. Subsequently, this accrual is amortized over the life of the loan and recorded as an increase in Revenue before reimbursements on the Statements of Comprehensive Income. At least semi-annually, we perform an analysis of the servicing portfolio with loss-sharing obligations to determine estimated probable losses. If estimated probable losses exceed the existing unamortized guarantee obligation, we record an expense to increase the loan loss accrual for this difference. As of September 30, 2018 and December 31, 2017 , loan loss accruals were $17.2 million and $16.0 million , respectively, and are included in Other liabilities on our Condensed Consolidated Balance Sheets.

Restructuring and Acquisition C

Restructuring and Acquisition Charges	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	11. RESTRUCTURING AND ACQUISITION CHARGES For the three and nine months ended September 30, 2018 , we recognized Restructuring and acquisition charges of $3.7 million and credits of $6.7 million , respectively. For the three and nine months ended September 30, 2017 , we recognized Restructuring and acquisition charges of $3.4 million and $13.3 million , respectively. For the three and nine months ended September 30, 2018 , we recognized $2.7 million and $17.5 million , respectively, related to net decreases to earn-out liabilities that arose from prior period acquisition activity, reflecting changes to our expectations of performance against contracted earn-out payment criteria. For the three and nine months ended September 30, 2017 , we recognized $0.6 million and $2.7 million , respectively, related to net decreases to earn-out liabilities that arose from prior period acquisition activity. In all periods, the remaining charges primarily consist of (1) severance and employment-related charges, including those related to external service providers, incurred in conjunction with a structural business shift, which can be represented by a notable change in headcount, change in leadership, or transformation of business processes, (2) lease exit charges, and (3) other acquisition and integration-related charges. The following tables show the restructuring and acquisition accrual activity and related payments, which are exclusive of the adjustments individually noted above. (in millions) Severance & Employment-Related Lease Exit Other Acquisition Total December 31, 2017 $ 14.2 5.7 1.4 $ 21.3 Accruals 9.8 0.2 0.8 10.8 Payments made (16.1 ) (0.5 ) (2.2 ) (18.8 ) September 30, 2018 $ 7.9 5.4 — $ 13.3 (in millions) Severance & Employment-Related Lease Other Total December 31, 2016 $ 19.7 5.5 5.8 $ 31.0 Accruals 10.6 0.7 4.7 16.0 Payments made (19.0 ) (0.6 ) (6.5 ) (26.1 ) September 30, 2017 $ 11.3 5.6 4.0 $ 20.9 We expect the majority of accrued severance and other accrued acquisition costs as of September 30, 2018 will be paid during the next twelve months. Lease exit payments depend on the terms of various leases, which extend as far out as 2022.

Noncontrolling Interest

Noncontrolling Interest	9 Months Ended
	Sep. 30, 2018
Noncontrolling Interest [Abstract]
Noncontrolling Interest Disclosure [Text Block]	12. NONCONTROLLING INTEREST We reflect changes in amounts attributable to noncontrolling interests in the Condensed Consolidated Statement of Changes in Equity. We present changes in amounts attributable to redeemable noncontrolling interests in the following table. (in millions) Redeemable noncontrolling interests as of December 31, 2017 $ 3.8 Acquisition of redeemable noncontrolling interest (1) (3.8 ) Redeemable noncontrolling interests as of September 30, 2018 $ — (1) Reflects our redemption of the final portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $2.3 million representing the difference between the redemption value and the carrying value of the acquired interest.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) by Component	9 Months Ended
	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) by Component	13. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT The tables below present the changes in Accumulated other comprehensive income (loss) ("AOCI") by component. For pension and postretirement benefits, we report amounts reclassified from AOCI relating to employer service cost in Compensation and benefits within the Condensed Consolidated Statements of Comprehensive Income. All other reclassifications relating to pension and postretirement benefits are reported within Other income. (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of June 30, 2018 $ (60.5 ) (331.1 ) $ (391.6 ) Other comprehensive loss before reclassification — (34.9 ) (34.9 ) Amounts reclassified from AOCI after tax expense of $ - , $ - and $ - 1.2 — 1.2 Other comprehensive loss after tax expense of $ - , $ - and $ - 1.2 (34.9 ) (33.7 ) Balance as of September 30, 2018 $ (59.3 ) (366.0 ) $ (425.3 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of June 30, 2017 $ (67.9 ) (352.8 ) $ (420.7 ) Other comprehensive income before reclassification — 46.0 46.0 Amounts reclassified from AOCI after tax expense of $0.3, $ - and $0.3 1.2 — 1.2 Other comprehensive income after tax expense of $0.3, $ - and $0.3 1.2 46.0 47.2 Balance as of September 30, 2017 $ (66.7 ) (306.8 ) $ (373.5 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of December 31, 2017 $ (60.5 ) (280.3 ) $ (340.8 ) Other comprehensive loss before reclassification — (85.7 ) (85.7 ) Amounts reclassified from AOCI after tax expense of $ - , $ - and $ - 1.2 — 1.2 Other comprehensive loss after tax expense of $ - , $ - and $ - 1.2 (85.7 ) (84.5 ) Balance as of September 30, 2018 $ (59.3 ) (366.0 ) $ (425.3 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of December 31, 2016 $ (68.7 ) (482.3 ) $ (551.0 ) Other comprehensive income before reclassification — 175.5 175.5 Amounts reclassified from AOCI after tax expense of $0.5, $ - and $0.5 2.0 — 2.0 Other comprehensive income after tax expense of $0.5, $ - and $0.5 2.0 175.5 177.5 Balance as of September 30, 2017 $ (66.7 ) (306.8 ) $ (373.5 )

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Event [Line Items]
Subsequent Events	On November 6, 2018 , we announced a cash dividend of $0.41 per share of common stock. The dividend payment will be made on December 14, 2018 , to holders of record at the close of business on November 16, 2018 . A dividend-equivalent in the same per share amount will also be paid simultaneously on outstanding but unvested shares of eligible restricted stock units granted under the Company's Stock Award and Incentive Plan.

New Accounting Standards New _2

New Accounting Standards New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2018
Text Block [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	2. NEW ACCOUNTING STANDARDS Recently adopted accounting guidance Effective January 1, 2018, we adopted Accounting Standards Update ("ASU") No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which requires an employer to disaggregate the employer service cost component from the other components of net periodic pension cost. The primary impact for JLL is the requirement to present the components of net periodic pension cost that do not represent the employer service cost outside of the subtotal "Operating income" on the Condensed Consolidated Statements of Comprehensive Income. As full retrospective application is required, we recast our comparative information, reclassifying the components of net periodic pension cost, other than the employer service cost component, from Compensation and benefits expense to Other income on the Condensed Consolidated Statements of Comprehensive Income. For the three and nine months ended September 30, 2017, the amount reclassified was a cost of $0.3 million and a benefit of $0.7 million , respectively. The adoption of ASU 2017-07 had no impact on our Condensed Consolidated Balance Sheets or Condensed Consolidated Statements of Cash Flows. Refer to the table below for the impact of adopting this ASU on our comparative Condensed Consolidated Statement of Comprehensive Income. Effective January 1, 2018, we adopted ASU No. 2016-18, Restricted Cash , which addresses classification and presentation of changes in restricted cash on the statement of cash flows. Specifically, this ASU requires a statement of cash flows to explain the changes during the period in cash, cash equivalents, and amounts reported as restricted cash or restricted cash equivalents. The primary effect of the adoption was the inclusion of restricted cash along with cash and cash equivalents in reconciling the beginning and ending total amounts shown on the Condensed Consolidated Statements of Cash Flows. We adopted this ASU on a full retrospective basis. Restricted cash is included in Prepaid and other current assets on the Condensed Consolidated Balance Sheets. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers; in March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , which clarifies the implementation guidance on principal versus agent considerations and together with ASU No. 2014-09 (collectively the "ASUs"), amends and comprises ASC Topic 606, Revenue from Contracts with Customers. These ASUs, and other related ASUs, replaced most existing revenue recognition guidance in U.S. generally accepted accounting principles ("U.S. GAAP"). Effective January 1, 2018, we adopted ASC Topic 606 on a full retrospective basis. The adoption of ASC Topic 606 resulted in an acceleration of the timing of revenue recognition for certain brokerage-related transaction commissions and advisory services. These items include variable consideration or other aspects, such as contingencies, that precluded revenue recognition contemporaneous with the satisfaction of our performance obligations within the previous revenue recognition framework. The acceleration of the timing of revenue recognition also resulted in the acceleration of expense recognition relating to direct commissions expense payable to brokers. Implementation of the updated principal versus agent considerations in ASC Topic 606 resulted in a significant increase to the proportion of our Property & Facility Management and Project & Development Services contracts presented on a gross basis (hereafter “gross contracts”). Under the previous principal versus agent framework, our evaluations for presentation of a service contract contemplated both performance and payment risk. Contractual provisions with clients and third-party vendors and subcontractors, such as “pay-when-paid”, that substantially mitigate our payment risk with respect to on-site personnel and other expenses incurred on our clients’ behalf have historically resulted in the majority of our service contracts being presented on a net basis. However, within ASC Topic 606, payment risk is not an evaluation factor; instead, control of the service before transfer to the customer is the focal point of current principal versus agent assessments. As a result, we determined that costs associated with all client-dedicated JLL personnel, even when directly reimbursed by clients, and arrangements where we control the services provided by a third-party prior to the transfer to the customer will now be presented on a gross basis. The incremental expenses and corresponding revenue recognized as a result of the adoption of the new principal versus agent framework are presented in new financial statement captions, Reimbursed expenses and Reimbursements, respectively, in our Condensed Consolidated Statements of Comprehensive Income. We have reclassified reimbursable activity in our comparative financial statements. Finally, the adoption of ASC Topic 606 resulted in a material increase to total assets and total liabilities to reflect (i) contract assets and accrued commissions payable recognized upon acceleration of the timing of revenue recognition for certain transactions commissions and advisory services and (ii) assets and liabilities relating to service contracts now reported on a gross basis. Balance sheet activity associated with contracts now reported on a gross basis is most prominently reflected within Reimbursable receivables and Reimbursable payables, new financial statement captions established in conjunction with our adoption of ASC Topic 606. We have reclassified reimbursable balances in our comparative financial statements. The impact of adopting new accounting pronouncements on a retrospective basis to the Consolidated Balance Sheet as of December 31, 2017, and Condensed Consolidated Statement of Comprehensive Income for the three and nine months ended September 30, 2017 , were as follows (for impacted financial statement captions): (in millions) Published December 31, 2017 (audited) Adjustment due to ASC Topic 606 As Restated December 31, 2017 (unaudited) Assets Trade receivables, net of allowances (1) $ 2,118.1 (378.7 ) $ 1,739.4 Note and other receivables (1) 393.6 (8.3 ) 385.3 Reimbursable receivables n/a 1,263.3 1,263.3 Short-term contract assets n/a 178.4 178.4 Prepaid & other current assets (2) 257.7 131.4 389.1 Long-term receivables 168.6 (3.9 ) 164.7 Other assets 97.8 57.7 155.5 Liabilities and equity Accounts payable and accrued liabilities (1) $ 1,011.6 (18.5 ) $ 993.1 Reimbursable payables n/a 1,022.6 1,022.6 Accrued compensation & benefits 1,309.0 110.1 1,419.1 Short-term contract liabilities and deferred income (1) 158.9 (3.5 ) 155.4 Other current liabilities (1) 263.8 (7.0 ) 256.8 Deferred tax liabilities, net 23.9 39.3 63.2 Retained earnings 2,552.8 96.2 2,649.0 Accumulated other comprehensive (loss) income (341.8 ) 1.0 (340.8 ) (1) Adjustments in these captions reflect reclassifications to new financial statement captions, Reimbursable receivables and Reimbursable payables. (2) Adjustments in this caption reflect an increase to restricted cash held on behalf of clients for contracts now presented on a gross basis. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Revenue Revenue before reimbursements (1) $ 1,947.0 33.7 — $ 1,980.7 Reimbursements (1) n/a 1,541.5 — 1,541.5 Total revenue 1,947.0 1,575.2 — 3,522.2 Operating expenses Compensation and benefits (1) 1,132.3 23.4 (0.3 ) 1,155.4 Operating, administrative and other (1) 651.4 (9.1 ) — 642.3 Reimbursed expenses (1) n/a 1,541.5 — 1,541.5 Operating income 118.1 19.4 0.3 137.8 Other income — — (0.3 ) (0.3 ) Provision for income taxes 28.2 7.8 — 36.0 Net income 87.5 11.7 — 99.2 Basic earnings per common share $ 1.91 0.26 — $ 2.17 Diluted earnings per common share $ 1.89 0.26 — $ 2.15 (1) Included in "Adjustments due to ASC Topic 606" is $13.3 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Nine months ended September 30, 2017 Revenue Revenue before reimbursements (1) $ 5,396.9 74.6 — $ 5,471.5 Reimbursements (1) n/a 4,638.7 — 4,638.7 Total revenue 5,396.9 4,713.3 — 10,110.2 Operating expenses Compensation and benefits (1) 3,146.6 52.1 0.7 3,199.4 Operating, administrative and other (1) 1,870.0 (17.5 ) — 1,852.5 Reimbursed expenses (1) n/a 4,638.7 — 4,638.7 Operating income 244.7 40.0 (0.7 ) 284.0 Other income — — 0.7 0.7 Provision for income taxes 57.3 15.8 — 73.1 Net income 177.5 24.3 — 201.8 Basic earnings per common share $ 3.88 0.53 — $ 4.41 Diluted earnings per common share $ 3.84 0.53 — $ 4.37 (1) Included in "Adjustments due to ASC Topic 606" is $43.5 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses. The cumulative impact to our retained earnings and Condensed Consolidated Statement of Comprehensive Income includes certain direct expenses, such as accrued commissions and deferred income taxes, resulting from the changes in accounting principle in accordance with ASC Topic 250, which partially offset the impact of the acceleration of revenue. The cumulative impact to our retained earnings from the adoption of ASC Topic 606, as of January 1, 2016, was $62.6 million . Recently issued accounting guidance, no t yet adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which increases transparency and comparability by requiring the recognition of lease assets and lease liabilities on the balance sheet as well as requiring the disclosure of key information about leasing arrangements. This ASU is effective for annual and interim periods beginning after December 15, 2018, with early adoption permitted. In July 2018, the FASB codified an alternative (and optional) transition method via ASU No. 2018-11, Leases (Topic 842): Targeted Improvements ; we will elect the use of this optional transition method. The adoption of ASC Topic 842 will result in the recognition of additional balances on the Condensed Consolidated Balance Sheet to reflect right-of-use assets and lease liabilities primarily associated with the leases for the corporate real estate we occupy around the globe. We expect the balance of our lease population to comprise vehicle and other equipment leases. As of September 30, 2018, we have substantially completed the identification of our real estate and non-real estate leases population. Our efforts are now directed to compiling and calculating the relevant inputs to derive ASC Topic 842's impact along with designing post-implementation processes and associated internal controls. Based upon current evaluations, we expect to recognize additional assets and liabilities upon implementation of ASC Topic 842 ranging from $500 million to $750 million to reflect right-of-use assets and lease liabilities as of January 1, 2019. However, because our evaluations are ongoing, the expected impact associated with the implementation of ASC Topic 842 is subject to change. Our disclosures related to leases will expand to comply with the requirements of ASC Topic 842; we continue to evaluate other effects ASC Topic 842 will have on our financial statements and related disclosures. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) , which creates a new framework to evaluate financial instruments, such as trade receivables, for expected credit losses. This new framework replaces the existing incurred loss approach and is expected to result in more timely recognition of credit losses. ASU No. 2016-13 is effective for annual and interim periods beginning after December 15, 2019 and early adoption is not permitted until years beginning after December 15, 2018. We are evaluating the effect this guidance will have on our financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which eliminates Step 2 from the goodwill impairment test. The annual goodwill impairment test will require companies to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge when the carrying amount exceeds the fair value of the reporting unit. This ASU is effective for annual and interim goodwill impairment tests beginning after December 15, 2019, with early adoption permitted. We do not believe this guidance will have a material impact on our financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-15, Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract , which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in ASC 350-40 when determining which implementation costs to capitalize as intangible assets. This ASU is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. We do not believe this guidance will have a material impact on our financial statements and related disclosures.

Revenue Recognition Revenue R_2

Revenue Recognition Revenue Recognition (Policies)	9 Months Ended
	Sep. 30, 2018
Revenue Recognition [Abstract]
Revenue Recognition, Services, Management Fees [Policy Text Block]	Property Management provides on-site day-to-day real estate management services for owners of office, industrial, retail, multifamily residential and various other types of properties, representing a series of daily performance obligations delivered over time. Pricing is generally in the form of a monthly management fee based upon property-level cash receipts, square footage under management or some other variable metric. Although we are principal in limited situations, we generally act as agent on behalf of our Property Management clients in relation to third-party vendors and subcontractors engaged to deliver operational services to our clients' properties. In these situations, we arrange, but do not control, the services provided by third-party vendors and subcontractors prior to the transfer of the services to the client. As a result, the costs incurred on behalf of clients, along with the corresponding revenue, are presented net on our Condensed Consolidated Statements of Comprehensive Income. Facilities Management primarily provides comprehensive, on-site day-to-day real estate management services to corporations and institutions across a broad range of industries that outsource the management of the real estate they occupy, representing a series of daily performance obligations delivered over time. Pricing generally includes a management fee and, in many instances, an incentive fee or other form of variable consideration. Although we may act as agent on behalf of our clients with respect to certain mandates, we generally act as principal for our Facilities Management contracts with respect to third-party vendors and subcontractors engaged to deliver operational services to our clients' facilities. In these situations, we control the services provided by such third-party vendors and subcontractors prior to the transfer of the services to the client. As a result, the costs incurred on behalf of our clients, along with the corresponding reimbursement revenue, are presented gross on our Condensed Consolidated Statements of Comprehensive Income.
Revenue Recognition, Real Estate Transactions, Policy [Policy Text Block]	Our performance obligation is to facilitate the execution of capital transactions and we are generally entitled to the full consideration at the point in time upon which our performance obligation is satisfied, at which time we recognize revenue.
Revenue Recognition, Leases [Policy Text Block]	Generally, we are either entitled to the full consideration upon lease execution or in part upon lease execution with the remainder upon the occurrence of a future event outside of our control (e.g. tenant occupancy, lease commencement, or rent commencement). The majority of the events that preclude our entitlement to the full consideration upon lease execution are considered to be “normal course of business” and, as a result, do not result in a constraint upon the recognition of revenue. In the infrequent instance our fee entitlement in a contract with a customer is predicated on the occurrence of future events that are uncertain of occurring, we constrain the recognition of revenue until the uncertainty is resolved or the future event occurs. Generally, less than 5% of our Leasing revenue recognized in a period had previously been constrained.
Revenue Recognition, Milestone Method [Table Text Block]	Depending on the terms of our engagement, our performance obligation is either to arrange for the completion of a project or to assume responsibility for completing a project on behalf of a client. Our obligations to clients are satisfied over time due to the continuous transfer of control of the underlying asset. Therefore, we recognize revenue over time, primarily using input measures (e.g. to-date costs incurred relative to total estimated costs at completion). Typically, we are entitled to consideration at distinct milestones over the term of an engagement.
Advisory, Consulting and Other [Policy Text Block]	Advisory, Consulting and Other includes a variety of different service offerings, whereby our performance obligation is to provide services as specified in the contract. Occasionally, our entitlement to consideration is predicated on the occurrence of an event such as the delivery of a report for which client acceptance is required. However, except for event-driven point-in-time transactions, the majority of services provided within this service line are delivered over time due to the continuous transfer of control to our clients.
Management and Investment Advisory Fees, Policy [Policy Text Block]	LaSalle provides real estate investment management services to clients and earns consideration in the form of advisory fees, transaction fees, and incentive fees. Typically, our performance obligation is to manage clients’ capital for a specified period of time and is delivered as a series of daily performance obligations over time. Revenue recognition for transaction and incentive fees is generally constrained until all contingencies have cleared due to the possibility of a significant reversal until completion of the events necessary to realize the associated consideration. Substantially all incentive fees recognized as revenue were previously constrained.

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements (Policies)	9 Months Ended
	Sep. 30, 2018
Fair Value Measurements [Abstract]
Fair Value Transfer, Policy [Policy Text Block]	Our policy is to recognize transfers at the end of quarterly reporting periods.

New Accounting Standards ASC 60

New Accounting Standards ASC 606 Adoption (Tables)	9 Months Ended
	Sep. 30, 2018
ASC 606 Adoption [Abstract]
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]	The impact of adopting new accounting pronouncements on a retrospective basis to the Consolidated Balance Sheet as of December 31, 2017, and Condensed Consolidated Statement of Comprehensive Income for the three and nine months ended September 30, 2017 , were as follows (for impacted financial statement captions): (in millions) Published December 31, 2017 (audited) Adjustment due to ASC Topic 606 As Restated December 31, 2017 (unaudited) Assets Trade receivables, net of allowances (1) $ 2,118.1 (378.7 ) $ 1,739.4 Note and other receivables (1) 393.6 (8.3 ) 385.3 Reimbursable receivables n/a 1,263.3 1,263.3 Short-term contract assets n/a 178.4 178.4 Prepaid & other current assets (2) 257.7 131.4 389.1 Long-term receivables 168.6 (3.9 ) 164.7 Other assets 97.8 57.7 155.5 Liabilities and equity Accounts payable and accrued liabilities (1) $ 1,011.6 (18.5 ) $ 993.1 Reimbursable payables n/a 1,022.6 1,022.6 Accrued compensation & benefits 1,309.0 110.1 1,419.1 Short-term contract liabilities and deferred income (1) 158.9 (3.5 ) 155.4 Other current liabilities (1) 263.8 (7.0 ) 256.8 Deferred tax liabilities, net 23.9 39.3 63.2 Retained earnings 2,552.8 96.2 2,649.0 Accumulated other comprehensive (loss) income (341.8 ) 1.0 (340.8 ) (1) Adjustments in these captions reflect reclassifications to new financial statement captions, Reimbursable receivables and Reimbursable payables. (2) Adjustments in this caption reflect an increase to restricted cash held on behalf of clients for contracts now presented on a gross basis. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Revenue Revenue before reimbursements (1) $ 1,947.0 33.7 — $ 1,980.7 Reimbursements (1) n/a 1,541.5 — 1,541.5 Total revenue 1,947.0 1,575.2 — 3,522.2 Operating expenses Compensation and benefits (1) 1,132.3 23.4 (0.3 ) 1,155.4 Operating, administrative and other (1) 651.4 (9.1 ) — 642.3 Reimbursed expenses (1) n/a 1,541.5 — 1,541.5 Operating income 118.1 19.4 0.3 137.8 Other income — — (0.3 ) (0.3 ) Provision for income taxes 28.2 7.8 — 36.0 Net income 87.5 11.7 — 99.2 Basic earnings per common share $ 1.91 0.26 — $ 2.17 Diluted earnings per common share $ 1.89 0.26 — $ 2.15 (1) Included in "Adjustments due to ASC Topic 606" is $13.3 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses. (in millions) Published Adjustment due to ASC Topic 606 Adjustment due to ASU 2017-07 As Restated Nine months ended September 30, 2017 Revenue Revenue before reimbursements (1) $ 5,396.9 74.6 — $ 5,471.5 Reimbursements (1) n/a 4,638.7 — 4,638.7 Total revenue 5,396.9 4,713.3 — 10,110.2 Operating expenses Compensation and benefits (1) 3,146.6 52.1 0.7 3,199.4 Operating, administrative and other (1) 1,870.0 (17.5 ) — 1,852.5 Reimbursed expenses (1) n/a 4,638.7 — 4,638.7 Operating income 244.7 40.0 (0.7 ) 284.0 Other income — — 0.7 0.7 Provision for income taxes 57.3 15.8 — 73.1 Net income 177.5 24.3 — 201.8 Basic earnings per common share $ 3.88 0.53 — $ 4.41 Diluted earnings per common share $ 3.84 0.53 — $ 4.37 (1) Included in "Adjustments due to ASC Topic 606" is $43.5 million representing the reclassification of historical reimbursed expenses and the corresponding reimbursement revenue into new financial statement captions, Reimbursements and Reimbursed expenses.

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Summarized Unaudited Financial Information by Business Segments	Summarized financial information by business segment is as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Americas - Real Estate Services Leasing $ 424.0 370.1 $ 1,151.4 1,057.5 Capital Markets 115.6 115.4 344.4 319.2 Property & Facility Management 1,271.5 1,077.0 3,713.4 3,230.7 Project & Development Services 304.7 288.2 848.8 843.7 Advisory, Consulting and Other 85.8 69.9 237.1 201.9 Revenue 2,201.6 1,920.6 6,295.1 5,653.0 Reimbursements (1,251.5 ) (1,094.9 ) (3,659.6 ) (3,283.4 ) Revenue before reimbursements 950.1 825.7 2,635.5 2,369.6 Gross contract costs (170.7 ) (124.9 ) (460.4 ) (387.1 ) Net non-cash MSR and mortgage banking derivative activity (5.3 ) (7.1 ) (9.3 ) (11.1 ) Fee revenue 774.1 693.7 2,165.8 1,971.4 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 821.2 710.2 2,306.8 2,078.2 Depreciation and amortization 24.5 24.2 77.1 71.4 Segment operating expenses, excluding reimbursed expenses 845.7 734.4 2,383.9 2,149.6 Gross contract costs (170.7 ) (124.9 ) (460.4 ) (387.1 ) Fee-based segment operating expenses 675.0 609.5 1,923.5 1,762.5 Segment operating income $ 104.4 91.3 $ 251.6 220.0 Equity earnings 0.1 0.1 0.6 0.5 Segment income $ 104.5 91.4 $ 252.2 220.5 EMEA - Real Estate Services Leasing $ 80.1 71.0 $ 211.9 186.6 Capital Markets 108.9 107.2 288.1 263.7 Property & Facility Management 336.3 335.9 1,078.9 975.0 Project & Development Services 220.1 170.3 663.5 472.0 Advisory, Consulting and Other 60.2 65.6 193.4 177.1 Revenue 805.6 750.0 2,435.8 2,074.4 Reimbursements (171.0 ) (108.5 ) (480.0 ) (335.9 ) Revenue before reimbursements 634.6 641.5 1,955.8 1,738.5 Gross contract costs (237.9 ) (258.9 ) (820.4 ) (739.2 ) Fee revenue 396.7 382.6 1,135.4 999.3 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 611.7 625.9 1,931.4 1,723.5 Depreciation and amortization 11.8 11.6 34.7 33.0 Segment operating expenses, excluding reimbursed expenses 623.5 637.5 1,966.1 1,756.5 Gross contract costs (237.9 ) (258.9 ) (820.4 ) (739.2 ) Fee-based segment operating expenses 385.6 378.6 1,145.7 1,017.3 Segment operating income (loss) $ 11.1 4.0 $ (10.3 ) (18.0 ) Equity earnings — — — — Segment income (loss) $ 11.1 4.0 $ (10.3 ) (18.0 ) Continued: Summarized financial information by business segment is as follows. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Asia Pacific - Real Estate Services Leasing $ 69.3 51.9 $ 165.2 133.7 Capital Markets 39.5 55.7 122.2 121.5 Property & Facility Management 529.2 490.0 1,590.6 1,449.4 Project & Development Services 108.7 109.5 309.8 297.4 Advisory, Consulting and Other 43.3 42.3 126.4 117.4 Revenue 790.0 749.4 2,314.2 2,119.4 Reimbursements (330.0 ) (333.5 ) (1,007.8 ) (1,005.9 ) Revenue before reimbursements 460.0 415.9 1,306.4 1,113.5 Gross contract costs (207.7 ) (169.1 ) (608.4 ) (462.5 ) Fee revenue 252.3 246.8 698.0 651.0 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 432.6 386.5 1,245.1 1,047.2 Depreciation and amortization 5.6 5.2 17.0 15.7 Segment operating expenses, excluding reimbursed expenses 438.2 391.7 1,262.1 1,062.9 Gross contract costs (207.7 ) (169.1 ) (608.4 ) (462.5 ) Fee-based segment operating expenses 230.5 222.6 653.7 600.4 Segment operating income $ 21.8 24.2 $ 44.3 50.6 Equity earnings 1.0 0.9 2.0 2.3 Segment income $ 22.8 25.1 $ 46.3 52.9 LaSalle Advisory fees $ 68.0 63.4 $ 205.0 190.0 Transaction fees & other 9.8 5.6 33.2 24.9 Incentive fees 94.8 33.2 145.4 48.5 Revenue 172.6 102.2 383.6 263.4 Reimbursements (3.6 ) (4.6 ) (13.2 ) (13.5 ) Revenue before reimbursements 169.0 97.6 370.4 249.9 Gross contract costs (0.7 ) (1.2 ) (3.2 ) (3.8 ) Fee revenue 168.3 96.4 367.2 246.1 Operating expenses, excluding reimbursed expenses: Compensation, operating and administrative expenses 110.9 75.1 265.9 203.0 Depreciation and amortization 0.8 0.8 2.3 2.2 Segment operating expenses, excluding reimbursed expenses 111.7 75.9 268.2 205.2 Gross contract costs (0.7 ) (1.2 ) (3.2 ) (3.8 ) Fee-based segment operating expenses 111.0 74.7 265.0 201.4 Segment operating income $ 57.3 21.7 $ 102.2 44.7 Equity earnings 2.3 11.6 24.6 29.9 Segment income $ 59.6 33.3 $ 126.8 74.6 Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Segment Reconciling Items Fee revenue $ 1,591.4 1,419.5 $ 4,366.4 3,867.8 Gross contract costs 617.0 554.1 1,892.4 1,592.6 Net non-cash MSR and mortgage banking derivative activity 5.3 7.1 9.3 11.1 Revenue before reimbursements 2,213.7 1,980.7 6,268.1 5,471.5 Reimbursements 1,756.1 1,541.5 5,160.6 4,638.7 Revenue $ 3,969.8 3,522.2 $ 11,428.7 10,110.2 Total segment operating expenses, excluding reimbursed expenses & before restructuring and acquisition charges $ 2,019.1 1,839.5 $ 5,880.3 5,174.2 Reimbursed expenses 1,756.1 1,541.5 5,160.6 4,638.7 Total segment operating expenses before restructuring and acquisition charges $ 3,775.2 3,381.0 $ 11,040.9 9,812.9 Operating income before restructuring and acquisition charges $ 194.6 141.2 $ 387.8 297.3 Restructuring and acquisition charges (credits) 3.7 3.4 (6.7 ) 13.3 Operating income $ 190.9 137.8 $ 394.5 284.0
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	The following table reconciles segment identifiable assets to consolidated amounts. (in millions) September 30, 2018 December 31, 2017 Real Estate Services: Americas $ 5,292.8 4,745.4 EMEA 2,168.3 2,367.5 Asia Pacific 1,287.9 1,305.0 LaSalle 584.3 548.6 Corporate 285.8 287.9 Consolidated $ 9,619.1 9,254.4

Business Combinations, Goodwi_2

Business Combinations, Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Summary of Earn-out Payments [Table Text Block]	Earn-Out Payments ($ in millions) September 30, 2018 December 31, 2017 Number of acquisitions with earn-out payments subject to the achievement of certain performance criteria 55 56 Maximum earn-out payments (undiscounted) $ 382.9 436.2 Short-term earn-out liabilities (fair value) 1 32.6 49.6 Long-term earn-out liabilities (fair value) 1 130.7 177.5 1 Included in Short-term and Long-term acquisition obligations on the Condensed Consolidated Balance Sheets
Movements in Goodwill by Reporting Segment	The following tables detail, by reporting segment, movements in goodwill. Real Estate Services (in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of December 31, 2017 $ 1,412.2 957.6 323.0 16.5 $ 2,709.3 Additions, net of adjustments 21.0 — 9.1 — 30.1 Impact of exchange rate movements (0.5 ) (39.5 ) (9.2 ) (0.5 ) (49.7 ) Balance as of September 30, 2018 $ 1,432.7 918.1 322.9 16.0 $ 2,689.7 Real Estate Services (in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of December 31, 2016 $ 1,406.1 851.7 306.1 15.4 $ 2,579.3 Additions, net of adjustments 5.2 17.9 6.5 — 29.6 Impact of exchange rate movements 0.9 80.5 10.0 1.0 92.4 Balance as of September 30, 2017 $ 1,412.2 950.1 322.6 16.4 $ 2,701.3
Movements in Gross Carrying Amount and Accumulated Amortization of Finite-Lived Intangible Assets	The following tables detail, by reporting segment, movements in the gross carrying amount and accumulated amortization of our identifiable intangibles. MSRs Other Intangibles (in millions) Americas Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of December 31, 2017 $ 241.8 117.0 88.8 23.3 — $ 470.9 Additions, net of adjustments (1) 36.8 3.6 — 2.1 — 42.5 Adjustment for fully amortized intangibles (17.2 ) (36.2 ) (1.7 ) (0.7 ) — (55.8 ) Impact of exchange rate movements — 0.3 (3.3 ) (2.0 ) — (5.0 ) Balance as of September 30, 2018 $ 261.4 84.7 83.8 22.7 — $ 452.6 Accumulated Amortization Balance as of December 31, 2017 $ (55.1 ) (61.3 ) (43.1 ) (6.4 ) — $ (165.9 ) Amortization, net (2) (32.2 ) (10.2 ) (9.5 ) (1.9 ) — (53.8 ) Adjustment for fully amortized intangibles 17.2 36.2 1.7 0.7 — 55.8 Impact of exchange rate movements — — 1.8 1.0 — 2.8 Balance as of September 30, 2018 $ (70.1 ) (35.3 ) (49.1 ) (6.6 ) — $ (161.1 ) Net book value as of September 30, 2018 $ 191.3 49.4 34.7 16.1 — $ 291.5 (1) Included in this amount for MSRs was $8.7 million relating to prepayments/write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. (2) Amortization of MSRs is included in Revenue before reimbursements within the Condensed Consolidated Statements of Comprehensive Income. MSRs Other Intangibles (in millions) Americas Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of December 31, 2016 $ 193.1 167.1 91.1 24.2 0.1 $ 475.6 Additions, net of adjustments (1) 50.7 0.4 3.1 5.8 — 60.0 Adjustment for fully amortized intangibles (12.5 ) (50.0 ) (7.7 ) (8.0 ) (0.1 ) (78.3 ) Impact of exchange rate movements — 0.2 7.6 1.3 — 9.1 Balance as of September 30, 2017 $ 231.3 117.7 94.1 23.3 — $ 466.4 Accumulated Amortization Balance as of December 31, 2016 $ (32.3 ) (98.7 ) (38.0 ) (11.5 ) (0.1 ) $ (180.6 ) Amortization, net (2) (29.8 ) (10.3 ) (11.2 ) (1.9 ) — (53.2 ) Adjustment for fully amortized intangibles 12.5 50.0 7.7 8.0 0.1 78.3 Impact of exchange rate movements — 0.3 (3.6 ) (0.2 ) — (3.5 ) Balance as of September 30, 2017 $ (49.6 ) (58.7 ) (45.1 ) (5.6 ) — $ (159.0 ) Net book value as of September 30, 2017 $ 181.7 59.0 49.0 17.7 — $ 307.4 (1) Included in this amount for MSRs was $7.7 million relating to prepayments/write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. (2) Amortization of MSRs is included in Revenue before reimbursements within the Condensed Consolidated Statements of Comprehensive Income.
Future Amortization Expense for Finite-Lived Intangible Assets	The remaining estimated future amortization expense of MSRs and other identifiable intangible assets, by year, as of September 30, 2018 , is presented in the following table. (in millions) MSRs Other Intangibles Total 2018 (3 months) $ 6.7 9.7 $ 16.4 2019 30.3 23.7 54.0 2020 28.4 19.2 47.6 2021 25.4 12.4 37.8 2022 22.5 6.5 29.0 2023 19.1 4.3 23.4 Thereafter 58.9 15.6 74.5 Total $ 191.3 91.4 $ 282.7

Investments in Real Estate Ve_2

Investments in Real Estate Ventures (Tables)	9 Months Ended
	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Investments in real estate ventures, Fair Value	The table below shows the movement in our investments in real estate ventures reported at fair value. (in millions) 2018 2017 Fair value investments as of January 1, $ 242.3 212.7 Investments 27.7 21.2 Distributions (31.0 ) (22.5 ) Change in fair value 8.2 17.9 Foreign currency translation adjustments, net (1.2 ) 4.9 Fair value investments as of September 30, $ 246.0 234.2
Consolidated Variable Interest Entities [Member]
Schedule of Equity Method Investments [Line Items]
Balance Sheet Amounts Consolidated for Variable Interest Entity [Table Text Block]	Summarized financial information for our consolidated VIEs is presented in the following tables. (in millions) September 30, 2018 December 31, 2017 Property and equipment, net $ 36.6 15.7 Investments in real estate ventures 13.9 12.6 Other assets (1) 11.1 44.4 Total assets $ 61.6 72.7 Other current liabilities (1) $ 1.0 30.9 Mortgage indebtedness (included in Other liabilities) 26.0 9.2 Total liabilities 27.0 40.1 Members' equity (included in Noncontrolling interest) 34.6 32.6 Total liabilities and members' equity $ 61.6 72.7 (1) Balances as of December 31, 2017, primarily represent investment properties and their corresponding liabilities, classified as held for sale.
Comprehensive Income Amounts Consolidated for Variable Interest Entity [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2018 2017 2018 2017 Revenue $ 1.6 1.8 $ 4.3 4.4 Operating and other expenses (1.4 ) (1.6 ) (3.8 ) (3.6 ) Net gains on sale of investments — — 2.0 — Net income $ 0.2 0.2 $ 2.5 0.8

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock Unit Activity	RSU and PSU activity is presented in the following tables. Shares (thousands) Weighted Average Weighted Average Unvested as of June 30, 2018 750.3 $ 131.09 2.36 Granted 5.8 144.43 Vested (81.2 ) 123.08 Forfeited (35.5 ) 136.07 Unvested as of September 30, 2018 639.4 $ 131.93 2.21 Unvested as of June 30, 2017 775.9 $ 117.74 1.61 Granted 5.1 115.47 Vested (70.9 ) 112.64 Forfeited (0.8 ) 130.32 Unvested as of September 30, 2017 709.3 $ 118.22 1.43 Shares (thousands) Weighted Average Weighted Average Remaining (in years) Unvested as of December 31, 2017 727.7 $ 118.96 1.24 Granted 225.8 161.87 Vested (259.3 ) 122.63 Forfeited (54.8 ) 132.64 Unvested as of September 30, 2018 639.4 $ 131.93 2.21 Unvested as of December 31, 2016 750.9 $ 113.97 1.71 Granted 157.0 116.50 Vested (177.3 ) 99.24 Forfeited (21.3 ) 113.18 Unvested as of September 30, 2017 709.3 $ 118.22 1.43

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table categorizes by level in the fair value hierarchy the estimated fair value of our assets and liabilities measured at fair value on a recurring basis. September 30, 2018 December 31, 2017 (in millions) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Investments in real estate ventures - fair value $ 42.4 — — 47.3 — — Foreign currency forward contracts receivable — 5.8 — — 13.2 — Warehouse receivables — 617.7 — — 317.5 — Deferred compensation plan assets — 277.8 — — 229.7 — Mortgage banking derivative assets — — 47.2 — — 19.0 Total assets at fair value $ 42.4 901.3 47.2 47.3 560.4 19.0 Liabilities Foreign currency forward contracts payable $ — 3.7 — — 1.9 — Deferred compensation plan liabilities — 268.3 — — 228.4 — Earn-out liabilities — — 163.3 — — 227.1 Mortgage banking derivative liabilities — — 28.5 — — 10.3 Total liabilities at fair value $ — 272.0 191.8 — 230.3 237.4
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The tables below present a reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). (in millions) Balance as of June 30, 2018 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements 2 Balance as of September 30, 2018 Mortgage banking derivative assets and liabilities, net $ 8.1 8.0 — 18.7 (16.1 ) $ 18.7 Earn-out liabilities 179.6 (2.7 ) (1.1 ) 1.1 (13.6 ) 163.3 (in millions) Balance as of June 30, 2017 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements Balance as of September 30, 2017 Mortgage banking derivative assets and liabilities, net $ 14.1 3.4 — 25.5 (31.5 ) $ 11.5 Earn-out liabilities 225.6 (0.6 ) 2.9 0.7 (5.1 ) 223.5 (in millions) Balance as of December 31, 2017 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements 2 Balance as of September 30, 2018 Mortgage banking derivative assets and liabilities, net $ 8.7 4.6 — 53.4 (48.0 ) $ 18.7 Earn-out liabilities 227.1 (17.5 ) (3.6 ) 2.7 (45.4 ) 163.3 (in millions) Balance as of December 31, 2016 Net change in fair value Foreign CTA 1 Purchases / Additions Settlements Balance as of September 30, 2017 Mortgage banking derivative assets and liabilities, net $ 15.5 11.8 — 56.6 (72.4 ) $ 11.5 Earn-out liabilities 229.6 (2.7 ) 7.4 11.4 (22.2 ) 223.5 1 CTA: Currency translation adjustments 2 In the third quarter of 2018, earn-out liabilities of $9.1 million were reclassified to guaranteed deferred acquisition obligations.
Fair Value, Qualitative Disclosures About Assets and Liabilities using Unobservable Inputs	Net change in fair value, included in the tables above, is reported in Net income as follows. Category of Assets/Liabilities using Unobservable Inputs Condensed Consolidated Statements of Comprehensive Income Account Caption Earn-out liabilities (Short-term and Long-term) Restructuring and acquisition charges Other current assets - Mortgage banking derivative assets Revenue before reimbursements Other current liabilities - Mortgage banking derivative liabilities Revenue before reimbursements

Debt Short-Term Borrowings and

Debt Short-Term Borrowings and Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	Short-term borrowings and long-term debt obligations are composed of the following. (in millions) September 30, 2018 December 31, 2017 Short-term borrowings: Local overdraft facilities $ 35.4 45.4 Other short-term borrowings 48.3 32.0 Total short-term borrowings $ 83.7 77.4 Credit facility, net of debt issuance costs of $16.8 and $15.3 223.2 (15.3 ) Long-term senior notes, 4.4%, face amount of $275.0, due November 2022, net of debt issuance costs of $1.7 and $2.0 273.3 273.0 Long-term senior notes, 1.96%, face amount of €175.0, due June 2027, net of debt issuance costs of $1.1 and $1.2 202.0 208.8 Long-term senior notes, 2.21%, face amount of €175.0, due June 2029, net of debt issuance costs of $1.1 and $1.1 202.0 208.8 Total debt $ 984.2 752.7
Schedule of Credit Facility, Average Outstanding Amount [Table Text Block]	The following tables provides additional information on our Facility. Three Months Ended September 30, Nine Months Ended September 30, ($ in millions) 2018 2017 2018 2017 Average outstanding borrowings under the Facility $ 461.5 712.3 $ 396.5 1,042.7 Effective interest rate on the Facility 3.0 % 2.3 % 2.8 % 2.0 %

Debt Warehouse Facilities (Tabl

Debt Warehouse Facilities (Tables)	9 Months Ended
	Sep. 30, 2018
Warehouse Facilities [Abstract]
Schedule of Warehouse Facilities	September 30, 2018 December 31, 2017 ($ in millions) Outstanding Balance Maximum Capacity Outstanding Balance Maximum Capacity Warehouse Facilities: LIBOR plus 1.3%, expires September 23, 2019 1 $ 292.5 375.0 156.4 375.0 LIBOR plus 1.25%, expires September 20, 2019 2 226.3 775.0 74.8 375.0 LIBOR plus 1.3%, expires August 31, 2019 3 54.0 100.0 — 100.0 Fannie Mae ASAP program, LIBOR plus 1.30% to 1.45% 40.7 n/a 79.2 n/a Gross warehouse facilities $ 613.5 1,250.0 310.4 850.0 Debt issuance costs (1.6 ) n/a (1.2 ) n/a Total warehouse facilities $ 611.9 1,250.0 309.2 850.0 1 In the third quarter of 2018, JLL extended the Warehouse facility; previously, the facility had a maturity date of September 29, 2018. 2 In the third quarter of 2018, JLL extended the Warehouse facility, increased the maximum capacity, and negotiated a decrease to the interest rate; previously, the facility had a maturity date of September 24, 2018, a maximum capacity of $375.0 million , and an interest rate of LIBOR plus 1.35%. 3 In the third quarter of 2018, JLL extended the Warehouse facility and negotiated a decrease to the interest rate; previously, the facility had a maturity date of August 31, 2018 and an interest rate of LIBOR plus 1.5%.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Loss Contingencies by Contingency [Table Text Block]	The following table shows the professional indemnity accrual activity and related payments. (in millions) December 31, 2017 $ 26.7 New claims 2.3 Prior year claims adjustments 12.3 Claims paid (7.3 ) September 30, 2018 $ 34.0 December 31, 2016 $ 7.3 New claims 0.7 Prior year claims adjustments 1.5 Claims paid (3.0 ) September 30, 2017 $ 6.5

Restructuring and Acquisition_2

Restructuring and Acquisition Charges (Tables)	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring Charges and Related Payment Activity	The following tables show the restructuring and acquisition accrual activity and related payments, which are exclusive of the adjustments individually noted above. (in millions) Severance & Employment-Related Lease Exit Other Acquisition Total December 31, 2017 $ 14.2 5.7 1.4 $ 21.3 Accruals 9.8 0.2 0.8 10.8 Payments made (16.1 ) (0.5 ) (2.2 ) (18.8 ) September 30, 2018 $ 7.9 5.4 — $ 13.3 (in millions) Severance & Employment-Related Lease Other Total December 31, 2016 $ 19.7 5.5 5.8 $ 31.0 Accruals 10.6 0.7 4.7 16.0 Payments made (19.0 ) (0.6 ) (6.5 ) (26.1 ) September 30, 2017 $ 11.3 5.6 4.0 $ 20.9

Noncontrolling Interest (Tables

Noncontrolling Interest (Tables)	9 Months Ended
	Sep. 30, 2018
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interest [Table Text Block]	We present changes in amounts attributable to redeemable noncontrolling interests in the following table. (in millions) Redeemable noncontrolling interests as of December 31, 2017 $ 3.8 Acquisition of redeemable noncontrolling interest (1) (3.8 ) Redeemable noncontrolling interests as of September 30, 2018 $ — (1) Reflects our redemption of the final portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $2.3 million representing the difference between the redemption value and the carrying value of the acquired interest.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) by Component (Tables)	9 Months Ended
	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The tables below present the changes in Accumulated other comprehensive income (loss) ("AOCI") by component. For pension and postretirement benefits, we report amounts reclassified from AOCI relating to employer service cost in Compensation and benefits within the Condensed Consolidated Statements of Comprehensive Income. All other reclassifications relating to pension and postretirement benefits are reported within Other income. (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of June 30, 2018 $ (60.5 ) (331.1 ) $ (391.6 ) Other comprehensive loss before reclassification — (34.9 ) (34.9 ) Amounts reclassified from AOCI after tax expense of $ - , $ - and $ - 1.2 — 1.2 Other comprehensive loss after tax expense of $ - , $ - and $ - 1.2 (34.9 ) (33.7 ) Balance as of September 30, 2018 $ (59.3 ) (366.0 ) $ (425.3 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of June 30, 2017 $ (67.9 ) (352.8 ) $ (420.7 ) Other comprehensive income before reclassification — 46.0 46.0 Amounts reclassified from AOCI after tax expense of $0.3, $ - and $0.3 1.2 — 1.2 Other comprehensive income after tax expense of $0.3, $ - and $0.3 1.2 46.0 47.2 Balance as of September 30, 2017 $ (66.7 ) (306.8 ) $ (373.5 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of December 31, 2017 $ (60.5 ) (280.3 ) $ (340.8 ) Other comprehensive loss before reclassification — (85.7 ) (85.7 ) Amounts reclassified from AOCI after tax expense of $ - , $ - and $ - 1.2 — 1.2 Other comprehensive loss after tax expense of $ - , $ - and $ - 1.2 (85.7 ) (84.5 ) Balance as of September 30, 2018 $ (59.3 ) (366.0 ) $ (425.3 ) (in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of December 31, 2016 $ (68.7 ) (482.3 ) $ (551.0 ) Other comprehensive income before reclassification — 175.5 175.5 Amounts reclassified from AOCI after tax expense of $0.5, $ - and $0.5 2.0 — 2.0 Other comprehensive income after tax expense of $0.5, $ - and $0.5 2.0 175.5 177.5 Balance as of September 30, 2017 $ (66.7 ) (306.8 ) $ (373.5 )

New Accounting Standards ASC _2

New Accounting Standards ASC 606 Adoption (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jan. 01, 2016
Trade receivables, net of allowances	$ 1,610		$ 1,610		$ 1,739.4
Notes and other receivables	297.6		297.6		385.3
Accounts Receivable, Reimbursed by Client, Current	1,400.8		1,400.8		1,263.3
Contract with Customer, Asset, Net, Current	293		293		178.4
Prepaid Expense and Other Assets, Current	315.2		315.2		389.1
Long-term receivables	179.6		179.6		164.7
Other Assets, Noncurrent	164.4		164.4		155.5
Accounts Payable and Accrued Liabilities, Current	995.1		995.1		993.1
Accounts Payable, Reimbursed by Client, Current	1,012.2		1,012.2		1,022.6
Accrued compensation & benefits	1,205.7		1,205.7		1,419.1
Short-term contract liabilities and deferred income	170.9		170.9		155.4
Other Liabilities, Current	195.2		195.2		256.8
Deferred tax liabilities, net	24.5		24.5		63.2
Retained earnings	2,913.3		2,913.3		2,649
Accumulated Other Comprehensive Income (Loss), Net of Tax	(425.3)		(425.3)		(340.8)
Revenue Before Reimbursements	2,213.7	$ 1,980.7	6,268.1	$ 5,471.5
Reimbursement Revenues	1,756.1	1,541.5	5,160.6	4,638.7
Revenue	3,969.8	3,522.2	11,428.7	10,110.2
Compensation and benefits	1,287	1,155.4	3,624.7	3,199.4
Operating, administrative and other	689.4	642.3	2,124.5	1,852.5
Cost of Reimbursable Expenses	1,756.1	1,541.5	5,160.6	4,638.7
Operating Income (Loss)	190.9	137.8	394.5	284
Other Nonoperating Income (Expense)	(0.3)	(0.3)	3.9	0.7
Provision for income taxes	45.6	36	96.7	73.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 136.1	$ 99.2	$ 288.5	$ 201.8
Basic earnings per common share (in dollars per share)	$ 2.96	$ 2.17	$ 6.22	$ 4.41
Diluted earnings per common share (in dollars per share)	$ 2.93	$ 2.15	$ 6.16	$ 4.37
Transition Adjustments [Member]
Cost of Reimbursable Expenses		$ 13.3		$ 43.5
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Trade receivables, net of allowances					2,118.1
Notes and other receivables					393.6
Prepaid Expense and Other Assets, Current					257.7
Long-term receivables					168.6
Other Assets, Noncurrent					97.8
Accounts Payable and Accrued Liabilities, Current					1,011.6
Accrued compensation & benefits					1,309
Short-term contract liabilities and deferred income					158.9
Other Liabilities, Current					263.8
Deferred tax liabilities, net					23.9
Retained earnings					2,552.8
Accumulated Other Comprehensive Income (Loss), Net of Tax					(341.8)
Revenue Before Reimbursements		1,947		5,396.9
Revenue		1,947		5,396.9
Compensation and benefits		1,132.3		3,146.6
Operating, administrative and other		651.4		1,870
Operating Income (Loss)		118.1		244.7
Other Nonoperating Income (Expense)		0		0
Provision for income taxes		28.2		57.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 87.5		$ 177.5
Basic earnings per common share (in dollars per share)		$ 1.91		$ 3.88
Diluted earnings per common share (in dollars per share)		$ 1.89		$ 3.84
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Trade receivables, net of allowances					(378.7)
Notes and other receivables					(8.3)
Accounts Receivable, Reimbursed by Client, Current					1,263.3
Contract with Customer, Asset, Net, Current					178.4
Prepaid Expense and Other Assets, Current					131.4
Long-term receivables					(3.9)
Other Assets, Noncurrent					57.7
Accounts Payable and Accrued Liabilities, Current					(18.5)
Accounts Payable, Reimbursed by Client, Current					1,022.6
Accrued compensation & benefits					110.1
Short-term contract liabilities and deferred income					(3.5)
Other Liabilities, Current					(7)
Deferred tax liabilities, net					39.3
Retained earnings					96.2
Accumulated Other Comprehensive Income (Loss), Net of Tax					$ 1
Revenue Before Reimbursements		$ 33.7		$ 74.6
Reimbursement Revenues		1,541.5		4,638.7
Revenue		1,575.2		4,713.3
Compensation and benefits		23.4		52.1
Operating, administrative and other		(9.1)		(17.5)
Cost of Reimbursable Expenses		1,541.5		4,638.7
Operating Income (Loss)		19.4		40
Other Nonoperating Income (Expense)		0		0
Provision for income taxes		7.8		15.8
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 11.7		$ 24.3
Basic earnings per common share (in dollars per share)		$ 0.26		$ 0.53
Diluted earnings per common share (in dollars per share)		$ 0.26		$ 0.53
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Retained earnings						$ 62.6
Adjustments for New Accounting Pronouncement [Member]
Revenue Before Reimbursements		$ 0		$ 0
Reimbursement Revenues		0		0
Revenue		0		0
Compensation and benefits		(0.3)		0.7
Operating, administrative and other		0		0
Cost of Reimbursable Expenses		0		0
Operating Income (Loss)		0.3		(0.7)
Other Nonoperating Income (Expense)		(0.3)		0.7
Provision for income taxes		0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 0		$ 0
Basic earnings per common share (in dollars per share)		$ 0		$ 0
Diluted earnings per common share (in dollars per share)		$ 0		$ 0

Revenue Recognition Revenue R_3

Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Percentage of Revenue, previously constrained	5.00%
Contract with Customer, Asset, Net	$ 345.5		$ 345.5		$ 236
Contract with Customer, Liability	90.4		$ 90.4		$ 73.7
Percentage of Revenue, Remaining Performance Obligation			5.00%
Out of Scope of Topic 606 Revenue [Member]
Disaggregation of Revenue [Line Items]
Fees and Commissions, Mortgage Banking and Servicing	$ 35.5	$ 41.2	$ 101.8	$ 91.9

Business Segments (Details)

Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Reimbursement Revenues	$ 1,756.1	$ 1,541.5	$ 5,160.6	$ 4,638.7
Segment revenue:
Revenue	3,969.8	3,522.2	11,428.7	10,110.2
Revenue Before Reimbursements	2,213.7	1,980.7	6,268.1	5,471.5
Operating expenses:
Depreciation and amortization	42.7	41.8	131.1	122.3
Operating Income (Loss)	190.9	137.8	394.5	284
Equity in earnings (losses)	3.4	12.6	27.2	32.7
Segment Reconciling Items:
Revenue	3,969.8	3,522.2	11,428.7	10,110.2
Total segment operating expenses before restructuring and acquisition charges	2,019.1	1,839.5	5,880.3	5,174.2
Cost of Reimbursable Expenses	1,756.1	1,541.5	5,160.6	4,638.7
Segment Operating Expenses before Restructuring and acquisition	3,775.2	3,381	11,040.9	9,812.9
Segment Reporting Information Operating Income Before Restructuring Charges	194.6	141.2	387.8	297.3
Restructuring and acquisition charges	3.7	3.4	(6.7)	13.3
Operating Income (Loss)	190.9	137.8	394.5	284
Assets	9,619.1		9,619.1		$ 9,254.4
Reportable Subsegments [Member]
Segment revenue:
Real Estate Revenues, Net	1,591.4	1,419.5	4,366.4	3,867.8
Operating expenses:
Gross contract vendor and subcontractor costs reimbursement	(617)	(554.1)	(1,892.4)	(1,592.6)
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Reimbursement Revenues	1,251.5	1,094.9	3,659.6	3,283.4
Segment revenue:
Revenue	2,201.6	1,920.6	6,295.1	5,653
Revenue Before Reimbursements	950.1	825.7	2,635.5	2,369.6
Derivative, Gain (Loss) on Derivative, Net	5.3	7.1	9.3	11.1
Real Estate Revenues, Net	774.1	693.7	2,165.8	1,971.4
Operating expenses:
Compensation, operating and administrative expenses	821.2	710.2	2,306.8	2,078.2
Depreciation and amortization	24.5	24.2	77.1	71.4
Operating Expenses, Excluding Reimbursed Expenses	845.7	734.4	2,383.9	2,149.6
Gross contract vendor and subcontractor costs reimbursement	(170.7)	(124.9)	(460.4)	(387.1)
Total fee based segment operating expenses	675	609.5	1,923.5	1,762.5
General Contractor Cost	170.7	124.9	460.4	387.1
Operating Income (Loss)	104.4	91.3	251.6	220
Equity in earnings (losses)	0.1	0.1	0.6	0.5
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	104.5	91.4	252.2	220.5
Segment Reconciling Items:
Revenue	2,201.6	1,920.6	6,295.1	5,653
Operating Income (Loss)	104.4	91.3	251.6	220
Assets	5,292.8		5,292.8		4,745.4
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Reimbursement Revenues	171	108.5	480	335.9
Segment revenue:
Revenue	805.6	750	2,435.8	2,074.4
Revenue Before Reimbursements	634.6	641.5	1,955.8	1,738.5
Real Estate Revenues, Net	396.7	382.6	1,135.4	999.3
Operating expenses:
Compensation, operating and administrative expenses	611.7	625.9	1,931.4	1,723.5
Depreciation and amortization	11.8	11.6	34.7	33
Operating Expenses, Excluding Reimbursed Expenses	623.5	637.5	1,966.1	1,756.5
Gross contract vendor and subcontractor costs reimbursement	(237.9)	(258.9)	(820.4)	(739.2)
Total fee based segment operating expenses	385.6	378.6	1,145.7	1,017.3
General Contractor Cost	237.9	258.9	820.4	739.2
Operating Income (Loss)	11.1	4	(10.3)	(18)
Equity in earnings (losses)	0	0	0	0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	11.1	4	(10.3)	(18)
Segment Reconciling Items:
Revenue	805.6	750	2,435.8	2,074.4
Operating Income (Loss)	11.1	4	(10.3)	(18)
Assets	2,168.3		2,168.3		2,367.5
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Reimbursement Revenues	330	333.5	1,007.8	1,005.9
Segment revenue:
Revenue	790	749.4	2,314.2	2,119.4
Revenue Before Reimbursements	460	415.9	1,306.4	1,113.5
Real Estate Revenues, Net	252.3	246.8	698	651
Operating expenses:
Compensation, operating and administrative expenses	432.6	386.5	1,245.1	1,047.2
Depreciation and amortization	5.6	5.2	17	15.7
Operating Expenses, Excluding Reimbursed Expenses	438.2	391.7	1,262.1	1,062.9
Gross contract vendor and subcontractor costs reimbursement	(207.7)	(169.1)	(608.4)	(462.5)
Total fee based segment operating expenses	230.5	222.6	653.7	600.4
General Contractor Cost	207.7	169.1	608.4	462.5
Operating Income (Loss)	21.8	24.2	44.3	50.6
Equity in earnings (losses)	1	0.9	2	2.3
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	22.8	25.1	46.3	52.9
Segment Reconciling Items:
Revenue	790	749.4	2,314.2	2,119.4
Operating Income (Loss)	21.8	24.2	44.3	50.6
Assets	1,287.9		1,287.9		1,305
Investment Management [Member]
Segment Reporting Information [Line Items]
Reimbursement Revenues	3.6	4.6	13.2	13.5
Segment revenue:
Revenue	172.6	102.2	383.6	263.4
Revenue Before Reimbursements	169	97.6	370.4	249.9
Real Estate Revenues, Net	168.3	96.4	367.2	246.1
Operating expenses:
Compensation, operating and administrative expenses	110.9	75.1	265.9	203
Depreciation and amortization	0.8	0.8	2.3	2.2
Operating Expenses, Excluding Reimbursed Expenses	111.7	75.9	268.2	205.2
Gross contract vendor and subcontractor costs reimbursement	(0.7)	(1.2)	(3.2)	(3.8)
Total fee based segment operating expenses	111	74.7	265	201.4
General Contractor Cost	0.7	1.2	3.2	3.8
Operating Income (Loss)	57.3	21.7	102.2	44.7
Equity in earnings (losses)	2.3	11.6	24.6	29.9
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	59.6	33.3	126.8	74.6
Segment Reconciling Items:
Revenue	172.6	102.2	383.6	263.4
Operating Income (Loss)	57.3	21.7	102.2	44.7
Assets	584.3		584.3		548.6
Segment Reconciling Items [Member]
Segment Reconciling Items:
Assets	285.8		285.8		$ 287.9
Leasing [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	424	370.1	1,151.4	1,057.5
Segment Reconciling Items:
Revenue	424	370.1	1,151.4	1,057.5
Leasing [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	80.1	71	211.9	186.6
Segment Reconciling Items:
Revenue	80.1	71	211.9	186.6
Leasing [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	69.3	51.9	165.2	133.7
Segment Reconciling Items:
Revenue	69.3	51.9	165.2	133.7
Capital Markets [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	115.6	115.4	344.4	319.2
Segment Reconciling Items:
Revenue	115.6	115.4	344.4	319.2
Capital Markets [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	108.9	107.2	288.1	263.7
Segment Reconciling Items:
Revenue	108.9	107.2	288.1	263.7
Capital Markets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	39.5	55.7	122.2	121.5
Segment Reconciling Items:
Revenue	39.5	55.7	122.2	121.5
Property & Facility Management [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	1,271.5	1,077	3,713.4	3,230.7
Segment Reconciling Items:
Revenue	1,271.5	1,077	3,713.4	3,230.7
Property & Facility Management [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	336.3	335.9	1,078.9	975
Segment Reconciling Items:
Revenue	336.3	335.9	1,078.9	975
Property & Facility Management [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	529.2	490	1,590.6	1,449.4
Segment Reconciling Items:
Revenue	529.2	490	1,590.6	1,449.4
Project & Development Services [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	304.7	288.2	848.8	843.7
Segment Reconciling Items:
Revenue	304.7	288.2	848.8	843.7
Project & Development Services [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	220.1	170.3	663.5	472
Segment Reconciling Items:
Revenue	220.1	170.3	663.5	472
Project & Development Services [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	108.7	109.5	309.8	297.4
Segment Reconciling Items:
Revenue	108.7	109.5	309.8	297.4
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	85.8	69.9	237.1	201.9
Segment Reconciling Items:
Revenue	85.8	69.9	237.1	201.9
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	60.2	65.6	193.4	177.1
Segment Reconciling Items:
Revenue	60.2	65.6	193.4	177.1
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	43.3	42.3	126.4	117.4
Segment Reconciling Items:
Revenue	43.3	42.3	126.4	117.4
Advisory Fees [Member] | Investment Management [Member]
Segment revenue:
Revenue	68	63.4	205	190
Segment Reconciling Items:
Revenue	68	63.4	205	190
Transaction Fees & Other [Member] | Investment Management [Member]
Segment revenue:
Revenue	9.8	5.6	33.2	24.9
Segment Reconciling Items:
Revenue	9.8	5.6	33.2	24.9
Incentive Fees [Member] | Investment Management [Member]
Segment revenue:
Revenue	94.8	33.2	145.4	48.5
Segment Reconciling Items:
Revenue	$ 94.8	$ 33.2	$ 145.4	$ 48.5

Business Combinations (Details)

Business Combinations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)acquisition	Sep. 30, 2017USD ($)
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition	4
Payments to Acquire Businesses	$ 31.7
Business Combinations, Guaranteed Deferred Acquisition Obligation	1.9	$ 1.8
Business Combination, contingent earn-out consideration	2.7	$ 11.5
Goodwill, Acquired During Period	30.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	5.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	0.5
Payment for Contingent Consideration Liability, Total	63.3
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 1.5

Business Combinations, Goodwi_3

Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions	Sep. 30, 2018USD ($)acquisition	Dec. 31, 2017USD ($)acquisition
Summary of Earn-out Payments [Line Items]
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition	55	56
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 382.9	$ 436.2
Business Combination, Contingent Consideration, Liability, Current	60	80.1
Business Combination, Contingent Consideration, Liability, Noncurrent	168.1	228.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Summary of Earn-out Payments [Line Items]
Business Combination, Contingent Consideration, Liability, Current	32.6	49.6
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 130.7	$ 177.5

Business Combinations, Goodwi_4

Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	$ 282.7
Identifiable intangibles with indefinite useful lives	8.8
Goodwill [Line Items]
Servicing Asset at Amortized Cost, Other than Temporary Impairments	8.7	$ 7.7
Goodwill [Roll Forward]
Goodwill	2,709.3	2,579.3
Goodwill Additions, net of adjustments	30.1	29.6
Goodwill, Translation Adjustments	(49.7)	92.4
Goodwill	2,689.7	2,701.3
Investment Management [Member]
Goodwill [Roll Forward]
Goodwill	16.5	15.4
Goodwill Additions, net of adjustments	0	0
Goodwill, Translation Adjustments	(0.5)	1
Goodwill	16	16.4
Americas [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	1,412.2	1,406.1
Goodwill Additions, net of adjustments	21	5.2
Goodwill, Translation Adjustments	(0.5)	0.9
Goodwill	1,432.7	1,412.2
EMEA [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	957.6	851.7
Goodwill Additions, net of adjustments	0	17.9
Goodwill, Translation Adjustments	(39.5)	80.5
Goodwill	918.1	950.1
Asia Pacific [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	323	306.1
Goodwill Additions, net of adjustments	9.1	6.5
Goodwill, Translation Adjustments	(9.2)	10
Goodwill	322.9	$ 322.6
Other Intangible Assets [Member]
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	91.4
Mortgage servicing rights [Member]
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	$ 191.3

Business Combinations Other Int

Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			$ 470.9	$ 475.6
Finite and Indefinite lived Intangible Assets, Additions	$ 42.5	$ 60
Adjustment for fully amortized intangibles	(55.8)	(78.3)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	(5)	9.1
Intangible Assets, Gross (Excluding Goodwill)	452.6	466.4
Identified intangibles, with finite useful lives, accumulated amortization	(161.1)	(159)	(165.9)	(180.6)
Amortization expense	(53.8)	(53.2)
Accumulated Amortization Adjustment for fully Amortized Intangibles	55.8	78.3
Impact of exchange rate movements	2.8	(3.5)
Net book value as of end of period	291.5	307.4	305
Servicing Asset at Amortized Cost, Other than Temporary Impairments	8.7	7.7
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018 (3 months)	16.4
2,019	54
2,020	47.6
2,021	37.8
2,022	29
2,023	23.4
Thereafter	74.5
Total	282.7
Mortgage servicing rights [Member]
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018 (3 months)	6.7
2,019	30.3
2,020	28.4
2,021	25.4
2,022	22.5
2,023	19.1
Thereafter	58.9
Total	191.3
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			241.8	193.1
Finite and Indefinite lived Intangible Assets, Additions	36.8	50.7
Adjustment for fully amortized intangibles	(17.2)	(12.5)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	0	0
Intangible Assets, Gross (Excluding Goodwill)	261.4	231.3
Identified intangibles, with finite useful lives, accumulated amortization	(70.1)	(49.6)	(55.1)	(32.3)
Amortization expense	(32.2)	(29.8)
Accumulated Amortization Adjustment for fully Amortized Intangibles	17.2	12.5
Impact of exchange rate movements	0	0
Net book value as of end of period	191.3	181.7
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2018 (3 months)	9.7
2,019	23.7
2,020	19.2
2,021	12.4
2,022	6.5
2,023	4.3
Thereafter	15.6
Total	91.4
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			117	167.1
Finite and Indefinite lived Intangible Assets, Additions	3.6	0.4
Adjustment for fully amortized intangibles	(36.2)	(50)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	0.3	0.2
Intangible Assets, Gross (Excluding Goodwill)	84.7	117.7
Identified intangibles, with finite useful lives, accumulated amortization	(35.3)	(58.7)	(61.3)	(98.7)
Amortization expense	(10.2)	(10.3)
Accumulated Amortization Adjustment for fully Amortized Intangibles	36.2	50
Impact of exchange rate movements	0	0.3
Net book value as of end of period	49.4	59
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			88.8	91.1
Finite and Indefinite lived Intangible Assets, Additions	0	3.1
Adjustment for fully amortized intangibles	(1.7)	(7.7)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	(3.3)	7.6
Intangible Assets, Gross (Excluding Goodwill)	83.8	94.1
Identified intangibles, with finite useful lives, accumulated amortization	(49.1)	(45.1)	(43.1)	(38)
Amortization expense	(9.5)	(11.2)
Accumulated Amortization Adjustment for fully Amortized Intangibles	1.7	7.7
Impact of exchange rate movements	1.8	(3.6)
Net book value as of end of period	34.7	49
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			23.3	24.2
Finite and Indefinite lived Intangible Assets, Additions	2.1	5.8
Adjustment for fully amortized intangibles	(0.7)	(8)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	(2)	1.3
Intangible Assets, Gross (Excluding Goodwill)	22.7	23.3
Identified intangibles, with finite useful lives, accumulated amortization	(6.6)	(5.6)	(6.4)	(11.5)
Amortization expense	(1.9)	(1.9)
Accumulated Amortization Adjustment for fully Amortized Intangibles	0.7	8
Impact of exchange rate movements	1	(0.2)
Net book value as of end of period	16.1	17.7
Other Intangible Assets [Member] | Investment Management [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Finite And Indefinite Lived Intangible Assets Gross			0	0.1
Finite and Indefinite lived Intangible Assets, Additions	0	0
Adjustment for fully amortized intangibles	0	(0.1)
Finite And Indefinite Lived Intangible Assets Translation Adjustments	0	0
Intangible Assets, Gross (Excluding Goodwill)	0	0
Identified intangibles, with finite useful lives, accumulated amortization	0	0	$ 0	$ (0.1)
Amortization expense	0	0
Accumulated Amortization Adjustment for fully Amortized Intangibles	0	0.1
Impact of exchange rate movements	0	0
Net book value as of end of period	$ 0	$ 0

Investments in Real Estate Ve_3

Investments in Real Estate Ventures (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)investment	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)investment	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	45		45
Minimum ownership percentage in real estate ventures (in hundredths)	1.00%		1.00%
Maximum ownership percentage in real estate ventures (in hundredths)	10.00%		10.00%
Property, Plant and Equipment, Net, consolidated VIE	$ 540.8		$ 540.8		$ 543.9
Investments in real estate ventures	371.5		371.5		376.2
Total assets	9,619.1		9,619.1		9,254.4
Other Liabilities, Current	195.2		195.2		256.8
Total liabilities	6,046.3		6,046.3		5,872.4
Total liabilities and equity	9,619.1		9,619.1		9,254.4
Revenue, consolidated VIE	3,969.8	$ 3,522.2	11,428.7	$ 10,110.2
Net income	136.1	99.2	288.5	201.8
Fair Value [Abstract]
Fair value investments at beginning of the period			242.3	212.7
Investments in Real Estate Ventures, at Fair Value, Additions			27.7	21.2
Investments in Real Estate Ventures, at Fair Value, Distributions			31	22.5
Unrealized Gain (Loss) on Investments			8.2	17.9
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation			(1.2)	4.9
Fair value investments at end of the period	$ 246	234.2	$ 246	234.2
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Partnership ownership interest (in hundredths)	49.00%		49.00%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 60.4		$ 60.4
Exclusive of LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	212.5		212.5
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Property, Plant and Equipment, Net, consolidated VIE	36.6		36.6		15.7
Investments in real estate ventures	13.9		13.9		12.6
Other Assets, consolidated VIE	11.1		11.1		44.4
Total assets	61.6		61.6		72.7
Other Liabilities, Current	1		1		30.9
Loans Payable, Fair Value Disclosure, consolidated VIE	26		26		9.2
Total liabilities	27		27		40.1
Members' Equity, consolidated VIE	34.6		34.6		32.6
Total liabilities and equity	61.6		61.6		$ 72.7
Revenue, consolidated VIE	1.6	1.8	4.3	4.4
Other Expenses, consolidated VIE	(1.4)	(1.6)	(3.8)	(3.6)
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE	0	0	2	0
Net income	$ 0.2	$ 0.2	$ 2.5	$ 0.8

Stock-based Compensation (Detai

Stock-based Compensation (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Restricted stock unit activity [Roll Forward]
Unvested at beginning of period (in shares)	750,300		775,900		727,700	750,900	750,900
Granted (in shares)	5,800		5,100		225,800	157,000
Vested (in shares)	(81,200)		(70,900)		(259,300)	(177,300)
Forfeited (in shares)	(35,500)		(800)		(54,800)	(21,300)
Unvested at end of period (in shares)	639,400	750,300	709,300	775,900	639,400	709,300	727,700	750,900
Restricted stock unit activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 131.09		$ 117.74		$ 118.96	$ 113.97	$ 113.97
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	144.43		115.47		161.87	116.50
Weighted average grant date fair value, vested (in dollars per share)	123.08		112.64		122.63	99.24
Weighted average grant date fair value, end of period (in dollars per share)	$ 131.93	$ 131.09	$ 118.22	$ 117.74	$ 131.93	$ 118.22	$ 118.96	$ 113.97
Weighted average remaining contractual life, unvested shares outstanding	2 years 2 months 16 days	2 years 4 months 10 days	1 year 5 months 6 days	1 year 7 months 10 days	2 years 2 months 16 days	1 year 5 months 6 days	1 year 2 months 26 days	1 year 8 months 15 days
Unamortized deferred compensation cost	$ 34.7				$ 34.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 136.07		$ 130.32		$ 132.64	$ 113.18

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0		$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0		0
Fair value of long-term debt	686.2	$ 712.6
Long-term debt, net of debt issuance costs	677.3	690.6
Investments, Fair Value Disclosure	246	242.3	$ 234.2	$ 212.7
Foreign currency forward contracts, gross notional value	2,070	2,430
Foreign currency forward contracts, net notional value	910	1,820
Deferred compensation plan, contra-equity, shares held in trust	6	5.9
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	7.5	14.4
Derivative Asset, Fair Value, Gross Liability	1.7	1.2
Derivative Liability, Fair Value, Gross Asset	1.1	2.3
Derivative Liability, Fair Value, Gross Liability	4.8	4.2
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	3.9	4.3
Fair Value, Measurements, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	203.6	195
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Foreign currency forward contract, current asset amount	5.8	13.2
Foreign currency forward contract, current liability amount	3.7	1.9
Deferred compensation plan assets	277.8	229.7
Deferred compensation plan liabilities	$ 268.3	$ 228.4

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 246		$ 242.3	$ 234.2		$ 212.7
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	42.4		47.3
Foreign currency forward contracts receivable	0		0
Loans Receivable, Fair Value Disclosure	0		0
Deferred compensation plan assets	0		0
Mortgage banking derivative asset	0		0
Total assets at fair value	42.4		47.3
Foreign currency forward contracts payable	0		0
Deferred compensation plan liabilities	0		0
Business Combination, Contingent Consideration, Liability	0		0
Mortgage banking derivative liabilities	0		0
Total liabilities at fair value	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0		0
Foreign currency forward contracts receivable	5.8		13.2
Loans Receivable, Fair Value Disclosure	617.7		317.5
Deferred compensation plan assets	277.8		229.7
Mortgage banking derivative asset	0		0
Total assets at fair value	901.3		560.4
Foreign currency forward contracts payable	3.7		1.9
Deferred compensation plan liabilities	268.3		228.4
Business Combination, Contingent Consideration, Liability	0		0
Mortgage banking derivative liabilities	0		0
Total liabilities at fair value	272		230.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	18.7	$ 8.1	8.7	11.5	$ 14.1	15.5
Investments, Fair Value Disclosure	0		0
Foreign currency forward contracts receivable	0		0
Loans Receivable, Fair Value Disclosure	0		0
Deferred compensation plan assets	0		0
Mortgage banking derivative asset	47.2		19
Total assets at fair value	47.2		19
Foreign currency forward contracts payable	0		0
Deferred compensation plan liabilities	0		0
Business Combination, Contingent Consideration, Liability	163.3	$ 179.6	227.1	$ 223.5	$ 225.6	$ 229.6
Mortgage banking derivative liabilities	28.5		10.3
Total liabilities at fair value	$ 191.8		$ 237.4

Fair Value Measurements Fair _2

Fair Value Measurements Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Business Combination, Contingent Consideration, Liability, Beginning Balance	$ 179.6	$ 225.6	$ 227.1	$ 229.6
Derivative Assets (Liabilities), at Fair Value, Net, Beginning Balance	8.1	14.1	8.7	15.5
Business Combination, Contingent Consideration, Liability, Ending Balance	163.3	223.5	163.3	223.5
Derivative Assets (Liabilities), at Fair Value, Net, Ending Balance	18.7	11.5	18.7	11.5
Earn-out Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(2.7)	(0.6)	(17.5)	(2.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1.1)	2.9	(3.6)	7.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1.1	0.7	2.7	11.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(13.6)	(5.1)	(45.4)	(22.2)
Derivative [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	8	3.4	4.6	11.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	18.7	25.5	53.4	56.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ (16.1)	$ (31.5)	$ (48)	$ (72.4)

Debt Short-Term Borrowings an_2

Debt Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bank Overdrafts	$ 35.4	$ 45.4
Other Short-term Borrowings	48.3	32
Short-term borrowings	83.7	77.4
Long-term debt, net of debt issuance costs	677.3	690.6
Debt, Long-term and Short-term, Combined Amount	984.2	752.7
Line of Credit [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	16.8	15.3
Long-term senior notes, 4.4%, due November 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, net of debt issuance costs	273.3	273
Debt Instrument, Face Amount	$ 275	$ 275
Debt Instrument, Interest Rate, Stated Percentage	4.40%	4.40%
Unamortized Debt Issuance Expense	$ 1.7	$ 2
Long-term senior notes, Euro notes, 1.96%, due June 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, net of debt issuance costs	202	208.8
Debt Instrument, Face Amount	$ 175	$ 175
Debt Instrument, Interest Rate, Stated Percentage	1.96%	1.96%
Unamortized Debt Issuance Expense	$ 1.1	$ 1.2
Long-term senior notes, Euro notes, 2.21%, due June 2029 [Member]
Debt Instrument [Line Items]
Long-term debt, net of debt issuance costs	202	208.8
Debt Instrument, Face Amount	$ 175	$ 175
Debt Instrument, Interest Rate, Stated Percentage	2.21%	2.21%
Unamortized Debt Issuance Expense	$ 1.1	$ 1.1

Credit Facility (Details)

Credit Facility (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Line of Credit Facility [Line Items]
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs	$ 223.2		$ 223.2		$ (15.3)
Line of Credit Facility, Maximum Borrowing Capacity	61.5		61.5
Letters of Credit Outstanding, Amount	8.6		8.6		9
Line of Credit [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs	223.2		223.2		$ (15.3)
Line of Credit Facility, Maximum Borrowing Capacity	2,750		2,750
Line of Credit Facility, Average Outstanding Amount	$ 461.5	$ 712.3	$ 396.5	$ 1,042.7
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)			1.00%
Line of Credit Facility, Interest Rate During Period	3.00%	2.30%	2.80%	2.00%

Debt Warehouse Facilities (Deta

Debt Warehouse Facilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 61.5
Warehouse facilities	611.9	$ 309.2
Warehouse Agreement Borrowings [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	1.6	1.2
Agreement expires September 20, 2019, Original Max Capacity [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	375
Agreement expires September 24, 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit, Current	292.5	156.4
Line of Credit Facility, Maximum Borrowing Capacity	$ 375	375
Pricing on the Facility based on market rates	LIBOR plus 1.3%
Agreement expires September 29, 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit, Current	$ 226.3	74.8
Line of Credit Facility, Maximum Borrowing Capacity	$ 775	375
Pricing on the Facility based on market rates	LIBOR plus 1.25%
Agreement expires August 31, 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit, Current	$ 54	0
Line of Credit Facility, Maximum Borrowing Capacity	$ 100	100
Pricing on the Facility based on market rates	LIBOR plus 1.3%
Fannie Mae ASAP program [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Repurchase Amount	$ 40.7	79.2
Debt Instrument, Interest Rate Terms	LIBOR plus 1.30% to 1.45%
Line of Credit, Gross [Member]
Line of Credit Facility [Line Items]
Line of Credit, Current	$ 613.5	310.4
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,250	$ 850

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Level of risk retained by our captive insurance company (per claim)	$ 2.5
Loss Contingency, Receivable	32.1		$ 22
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount	8,400		8,000
Loan loss accrual	17.2		$ 16
Insurance Claims [Member]
Loss Contingency Accrual [Roll Forward]
Loss Contingency Accrual	26.7	$ 7.3
Loss Contingency Accrual, Provision	2.3	0.7
Loss Contingency Accrual, Provision Adjustment	12.3	1.5
Loss Contingency Accrual, Payments	(7.3)	(3)
Loss Contingency Accrual	$ 34	$ 6.5

Restructuring and Acquisition_3

Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (3.7)	$ (3.4)	$ 6.7	$ (13.3)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(2.7)	(0.6)	(17.5)	(2.7)
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			21.3	31
Restructuring charges			10.8	16
Payments made			(18.8)	(26.1)
Restructuring reserve, ending balance	13.3	20.9	13.3	20.9
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			14.2	19.7
Restructuring charges			9.8	10.6
Payments made			(16.1)	(19)
Restructuring reserve, ending balance	7.9	11.3	7.9	11.3
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			5.7	5.5
Restructuring charges			0.2	0.7
Payments made			(0.5)	(0.6)
Restructuring reserve, ending balance	5.4	5.6	5.4	5.6
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			1.4	5.8
Restructuring charges			0.8	4.7
Payments made			(2.2)	(6.5)
Restructuring reserve, ending balance	$ 0	$ 4	$ 0	$ 4

Noncontrolling Interest Noncont

Noncontrolling Interest Noncontrolling Interest (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interest	$ 3.8
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3.8)
Redeemable Noncontrolling Interest	0
Change in fair value of redeemable noncontrolling interest	2.3
Additional Paid-In Capital [Member]
Noncontrolling Interest [Abstract]
Change in fair value of redeemable noncontrolling interest	$ 2.3

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 3,572.8		$ 3,572.8			$ 3,378.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1.2	$ 1.2	1.2	$ 2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(34.9)	46	(85.7)	175.5
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(59.3)	(66.7)	(59.3)	(66.7)	$ (60.5)	(60.5)	$ (67.9)	$ (68.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1.2	1.2	1.2	2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	(1.2)	(1.2)	(1.2)	(2)
Reclassification from AOCI, Current Period, Tax	0	0.5	0	0.3
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	0.5	0	0.3
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(366)	(306.8)	(366)	(306.8)	(331.1)	(280.3)	(352.8)	(482.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(34.9)	46	(85.7)	175.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(34.9)	46	(85.7)	175.5
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	0	0	0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(425.3)	(373.5)	(425.3)	(373.5)	$ (391.6)	$ (340.8)	$ (420.7)	$ (551)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(34.9)	46	(85.7)	175.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1.2	1.2	1.2	2
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(33.7)	47.2	(84.5)	177.5
Reclassification from AOCI, Current Period, Tax	0	0.5	0	0.3
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	$ 0	$ 0.5	$ 0	$ 0.3

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Event (Details) - $ / shares	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 07, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0	$ 0	$ 0.41	$ 0.35
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Nov. 6, 2018
Common Stock, Dividends, Per Share, Declared	$ 0.41
Dividends Payable, Date to be Paid	Dec. 14, 2018
Dividends Payable, Date of Record	Nov. 16, 2018