ManpowerGroup (MAN) 10-K 23 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ManpowerGroup Inc.
Entity Central Index Key	871,763
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7,447,212,427
Entity Common Stock, Shares Outstanding		66,161,457
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues from services	$ 21,034.3	$ 19,654.1	$ 19,329.9
Cost of services	17,549.7	16,320.3	16,034.1
Gross profit	3,484.6	3,333.8	3,295.8
Selling and administrative expenses	2,696.4	2,583	2,606.9
Operating profit	788.2	750.8	688.9
Interest and other expenses	50.9	49.5	28.2
Earnings before income taxes	737.3	701.3	660.7
Provision for income taxes	191.9	257.6	241.5
Net earnings	$ 545.4	$ 443.7	$ 419.2
Net earnings per share - basic (in dollars per share)	$ 8.13	$ 6.33	$ 5.46
Net earnings per share - diluted (in dollars per share)	$ 8.04	$ 6.27	$ 5.40
Weighted average shares - basic (in shares)	67.1	70.1	76.8
Weighted average shares - diluted (in shares)	67.9	70.8	77.7

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 545.4	$ 443.7	$ 419.2
Other comprehensive income (loss):
Foreign currency translation	201.4	(79.9)	(182.8)
Translation adjustments on net investment hedge, net of income taxes of $(34.3), $8.4 and $19.2, respectively	(64.7)	14.8	34.5
Translation adjustments on long-term intercompany loans	4.9	(58.2)	(2.1)
Unrealized (loss) gain on investments, net of income taxes of $(0.8), $0.4 and $0.1, respectively	(3.3)	1.6	0.3
Defined benefit pension plans and retiree health care plan, net of income taxes of $(0.1), $(5.8) and $7.8, respectively	(0.4)	(18.4)	19.3
Total other comprehensive income (loss)	137.9	(140.1)	(130.8)
Comprehensive income	$ 683.3	$ 303.6	$ 288.4

CONSOLIDATED STATEMENTS OF COM4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other comprehensive income (loss):
Income tax expense (benefit) on translation adjustments on net investment hedge	$ (34.3)	$ 8.4	$ 19.2
Income tax expense (benefit) on unrealized gain (loss) on investments	(0.8)	0.4	0.1
Income tax expense (benefit) on defined benefit pension plans and retiree health care plan	$ (0.1)	$ (5.8)	$ 7.8

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 689	$ 598.5
Accounts receivable, less allowance for doubtful accounts of $110.8 and $98.2, respectively	5,370.5	4,413.1
Prepaid expenses and other assets	111.7	121.3
Total current assets	6,171.2	5,132.9
Other Assets
Goodwill	1,343	1,239.9
Intangible assets, less accumulated amortization of $339.9 and $299.8, respectively	284	294.4
Other assets	927.7	759.7
Total other assets	2,554.7	2,294
Property and Equipment
Land, buildings, leasehold improvements and equipment	633.4	567
Less: accumulated depreciation and amortization	475.7	419.7
Net property and equipment	157.7	147.3
Total assets	8,883.6	7,574.2
Current Liabilities
Accounts payable	2,279.4	1,914.4
Employee compensation payable	230.6	208.1
Accrued liabilities	490.9	398.6
Accrued payroll taxes and insurance	794.7	649.2
Value added taxes payable	545.4	448.7
Short-term borrowings and current maturities of long-term debt	469.4	39.8
Total current liabilities	4,810.4	3,658.8
Other liabilities
Long-term debt	478.1	785.6
Other long-term liabilities	737.5	683.4
Total other liabilities	1,215.6	1,469
Shareholders’ Equity
Preferred stock, $.01 par value, authorized 25,000,000 shares, none issued	0	0
Common stock, $.01 par value, authorized 125,000,000 shares, issued 116,303,729 and 115,115,748 shares, respectively	1.2	1.2
Capital in excess of par value	3,302.6	3,227.2
Retained earnings	2,713	2,291.3
Accumulated other comprehensive loss	(288.2)	(426.1)
Treasury stock at cost, 50,226,525 and 48,146,658 shares, respectively	(2,953.7)	(2,731.7)
Total ManpowerGroup shareholders' equity	2,774.9	2,361.9
Noncontrolling interests	82.7	84.5
Total shareholders’ equity	2,857.6	2,446.4
Total liabilities and shareholders’ equity	$ 8,883.6	$ 7,574.2

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Allowance for doubtful accounts	$ 110.8	$ 98.2
Other Assets
Accumulated amortization on intangible assets	$ 339.9	$ 299.8
Shareholders' Equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	25,000,000	25,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	125,000,000	125,000,000
Common stock, issued (in shares)	116,303,729	115,115,748
Treasury stock at cost (in shares)	50,226,525	48,146,658

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net earnings	$ 545.4	$ 443.7	$ 419.2
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	84.4	85.3	77.7
Deferred income taxes	(196.8)	74	91.2
Provision for doubtful accounts	18.1	20.4	16.3
Share-based compensation	28.7	27.1	31.1
Excess tax benefit on exercise of share-based awards	0	(0.8)	(7.4)
Change in operating assets and liabilities, excluding the impact of acquisitions:
Accounts receivable	(544.9)	(317.2)	(369.8)
Other assets	(68.6)	(75.3)	(59.7)
Other liabilities	534.6	342.8	312.9
Cash provided by operating activities	400.9	600	511.5
Cash Flows from Investing Activities
Capital expenditures	(54.7)	(56.9)	(52.3)
Acquisitions of businesses, net of cash acquired	(32.7)	(57.6)	(260.5)
Proceeds from the sale of investments, property and equipment	12.9	4.1	14.7
Cash used in investing activities	(74.5)	(110.4)	(298.1)
Cash Flows from Financing Activities
Net change in short-term borrowings	5.5	(0.3)	4.1
Proceeds from long-term debt	0.1	0	454
Repayments of long-term debt	(0.4)	(6.4)	(2)
Payments for debt issuance costs	0	0	(2.5)
Payments of contingent considerations for acquisitions	(13)	(2.9)	0
Proceeds from share-based awards and other equity transactions	44.2	18	104.1
Payments to noncontrolling interests	(10)	0	0
Other share-based award transactions	(18.1)	(5.4)	(0.7)
Repurchases of common stock	(203.9)	(482.2)	(580.2)
Dividends paid	(123.7)	(118.4)	(121)
Cash used in financing activities	(319.3)	(597.6)	(144.2)
Effect of exchange rate changes on cash	83.4	(24)	(37.9)
Net increase (decrease) in cash and cash equivalents	90.5	(132)	31.3
Cash and cash equivalents, beginning of year	598.5	730.5	699.2
Cash and cash equivalents, end of year	689	598.5	730.5
Supplemental Cash Flow Information
Interest paid	37	36.6	32.2
Income taxes paid, net	$ 127.1	$ 163.9	$ 75.9

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Non- controlling Interests
Balance at beginning of period (in shares) at Dec. 31, 2014		112,876,552
Balance at beginning of period at Dec. 31, 2014	$ 2,943	$ 1.1	$ 3,084.2	$ 1,667.8	$ (155.2)	$ (1,654.9)	$ 0
Net earnings	419.2			419.2
Other comprehensive income (loss)	(130.8)				(130.8)
Issuances under equity plans (in shares)		1,628,376
Issuances under equity plans	69.5	$ 0.1	77.5			(8.1)
Share-based compensation expense	31.1		31.1
Dividends	(121)			(121)
Repurchases of common stock	(580.2)					(580.2)
Contribution from a noncontrolling interest and other noncontrolling interest transactions	61.7		(6.1)				67.8
Balance at end of period (in shares) at Dec. 31, 2015		114,504,928
Balance at end of period at Dec. 31, 2015	2,692.5	$ 1.2	3,186.7	1,966	(286)	(2,243.2)	67.8
Net earnings	443.7			443.7
Other comprehensive income (loss)	(140.1)				(140.1)
Issuances under equity plans (in shares)		610,820
Issuances under equity plans	14.2		20.5			(6.3)
Share-based compensation expense	27.1		27.1
Dividends	(118.4)			(118.4)
Repurchases of common stock	(482.2)					(482.2)
Noncontrolling interest transactions	9.6		(7.1)				16.7
Balance at end of period (in shares) at Dec. 31, 2016		115,115,748
Balance at end of period at Dec. 31, 2016	2,446.4	$ 1.2	3,227.2	2,291.3	(426.1)	(2,731.7)	84.5
Net earnings	545.4			545.4
Other comprehensive income (loss)	137.9				137.9
Issuances under equity plans (in shares)		1,187,981
Issuances under equity plans	26.1		44.2			(18.1)
Share-based compensation expense	28.7		28.7
Dividends	(123.7)			(123.7)
Repurchases of common stock	(203.9)					(203.9)
Noncontrolling interest transactions	0.7		2.5				(1.8)
Balance at end of period (in shares) at Dec. 31, 2017		116,303,729
Balance at end of period at Dec. 31, 2017	$ 2,857.6	$ 1.2	$ 3,302.6	$ 2,713	$ (288.2)	$ (2,953.7)	$ 82.7

CONSOLIDATED STATEMENTS OF SHA9

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 0.93	$ 0	$ 0.93	$ 0	$ 0.86	$ 0	$ 0.86	$ 0	$ 1.86	$ 1.72	$ 1.60

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations ManpowerGroup Inc. is a world leader in the innovative workforce solutions and services industry. Our global network of nearly 2,700 offices in 80 countries and territories allows us to meet the needs of our global, multinational and local clients across all major industry segments. Our largest operations, based on revenues, are located in France, the United States, the United Kingdom and Italy. We specialize in permanent, temporary and contract recruitment and assessment; training and development; outsourcing; career management and workforce consulting services. We provide services to a wide variety of clients, none of which individually comprise a significant portion of revenues for us as a whole. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the reporting period. Actual results could differ from these estimates. Basis of Consolidation The Consolidated Financial Statements include our operating results and the operating results of all of our majority-owned subsidiaries and entities in which we have a controlling financial interest. We have a controlling financial interest if we own a majority of the outstanding voting common stock and the noncontrolling shareholders do not have substantive participating rights, or we have significant control over an entity through contractual or economic interests in which we are the primary beneficiary. For subsidiaries in which we have an ownership interest of 50% or less, but more than 20%, the Consolidated Financial Statements reflect our ownership share of those earnings using the equity method of accounting. These investments, as well as certain other relationships, are also evaluated for consolidation under the accounting guidance on consolidation of variable interest entities. These investments were $158.7 and $145.8 as of December 31, 2017 and 2016 , respectively, and are included in other assets in the Consolidated Balance Sheets. Included in shareholders’ equity as of December 31, 2017 and 2016 are $103.9 and $88.9 , respectively, of unremitted earnings from investments accounted for using the equity method. All significant intercompany accounts and transactions have been eliminated in consolidation. Revenues We generate revenues from sales of services by our company-owned branch operations and from fees earned on sales of services by our franchise operations. Revenues are recognized as services are performed. The majority of our revenues are generated by our recruitment business, where billings are generally negotiated and invoiced on a per-hour basis. Accordingly, as contingent workers are placed, we record revenues based on the hours worked. Permanent recruitment revenues are recorded as placements are made. Provisions for sales allowances, based on historical experience, are recognized at the time the related sale is recognized. Our franchise agreements generally state that franchise fees are calculated based on a percentage of revenues. We record franchise fee revenues monthly based on the amounts due under the franchise agreements for that month. Franchise fees, which are included in revenues from services, were $23.7 , $23.3 and $24.2 for the years ended December 31, 2017 , 2016 and 2015 , respectively. In our outplacement business, we recognize revenues from individual programs and for large projects over the estimated period in which services are rendered to candidates. In our consulting business, revenues are recognized upon the performance of the service under the consulting service contract. For performance-based contracts, we defer recognizing revenues until the performance criteria have been met. The amounts billed for outplacement, consulting services and performance-based contracts in excess of the amount recognized as revenues are recorded as deferred revenue and included in accrued liabilities for the current portion and other long-term liabilities for the long-term portion in our Consolidated Balance Sheets. As of December 31, 2017 and 2016 , the current portion of deferred revenue was $46.5 and $38.7 , respectively, and the long-term portion of deferred revenue was $1.5 and $2.4 , respectively. W e record revenues from sales of services and the related direct costs in accordance with the accounting guidance on reporting revenue gross as a principal versus net as an agent. In situations where we act as a principal in the transaction, we report gross revenues and cost of services. When we act as an agent, we report the revenues on a net basis. Amounts billed to clients for out-of-pocket or other cost reimbursements are included in revenues from services, and the related costs are included in cost of services. Allowance for Doubtful Accounts We have an allowance for doubtful accounts recorded as an estimate of the accounts receivable balance that may not be collected. This allowance is calculated on an entity-by-entity basis with consideration for historical write-off experience, the current aging of receivables and a specific review for potential bad debts. Items that affect this balance mainly include bad debt expense and the write-off of accounts receivable balances. Bad debt expense is recorded as selling and administrative expenses in our Consolidated Statements of Operations and was $18.1 , $20.4 and $16.3 in 2017 , 2016 and 2015 , respectively. Factors that would cause this provision to increase primarily relate to increased bankruptcies by our clients and other difficulties collecting amounts billed. On the other hand, an improved write-off experience and aging of receivables would result in a decrease to the provision. Write-offs were $17.6 , $16.9 and $20.3 for 2017 , 2016 and 2015 , respectively. Advertising Costs We expense production costs of advertising as they are incurred. Advertising expenses were $26.6 , $24.4 and $28.8 in 2017 , 2016 and 2015 , respectively. Restructuring Costs We recorded net restructuring costs of $34.5 in 2017 in selling and administrative expenses, primarily related to severances and office closures and consolidations in multiple countries and territories. During 2017 and 2016 , we made payments of $25.5 and $11.9 , respectively, out of our restructuring reserve. We expect a majority of the remaining $13.5 reserve will be paid by the end of 2018 . Changes in the restructuring liability balances for each reportable segment and Corporate were as follows: Americas (1) Southern Europe (2) Northern Europe APME Right Management Corporate Total Balance, January 1, 2016 $3.5 $1.7 $8.5 $1.7 $0.8 $0.2 $16.4 Costs paid or utilized (3.1 ) (0.4 ) (5.9 ) (1.6 ) (0.7 ) (0.2 ) (11.9 ) Balance, December 31, 2016 0.4 1.3 2.6 0.1 0.1 — 4.5 Severance costs 5.8 — 15.6 0.9 1.4 1.0 24.7 Office closure costs 0.5 — 8.2 0.5 0.6 — 9.8 Costs paid or utilized (5.0 ) (0.4 ) (16.8 ) (1.5 ) (0.9 ) (0.9 ) (25.5 ) Balance, December 31, 2017 $1.7 $0.9 $9.6 $— $1.2 $0.1 $13.5 (1) Balance related to United States was $2.9 as of January 1, 2016. In 2016 , United States paid/utilized $2.5 , leaving a $0.4 liability as of December 31, 2016 . In 2017 , United States incurred $3.7 for severance costs and $0.5 for office closure costs and paid/utilized $3.1 , leaving a $1.5 liability as of December 31, 2017 . (2) Balance related to France was $1.5 as of January 1, 2016. In 2016 , France paid/utilized $0.2 , leaving a $1.3 liability as of December 31, 2016 . In 2017 , France paid/utilized $0.4 , leaving a $0.9 liability as of December 31, 2017 . Italy had no restructuring reserves recorded as of either January 1, 2016, December 31, 2016 or December 31, 2017 . Income Taxes We account for income taxes in accordance with the accounting guidance on income taxes. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between financial statement carrying amounts of existing assets and liabilities and their respective tax basis, and net operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. We record a valuation allowance against deferred tax assets to reduce the assets to the amounts more likely than not to be realized. In December 2017, the United States enacted the Tax Cuts and Jobs Act of 2017 (“Tax Act”), and the Securities and Exchange Commission staff issued guidance on accounting for the tax effects of the Tax Act, which allows for a measurement period up to one year from the Tax Act enactment date for companies to complete the accounting. In accordance with the guidance, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete, but the company is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply current guidance on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. (See Note 5 to our Consolidated Financial Statements for further information on the impacts of the Tax Act.) Fair Value Measurements The assets and liabilities measured and recorded at fair value on a recurring basis were as follows: Fair Value Measurements Using Fair Value Measurements Using December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2016 Quoted Prices in Significant Significant Assets Deferred compensation plan assets $99.1 $99.1 $— $— $86.8 $86.8 $— $— $99.1 $99.1 $— $— $86.8 $86.8 $— $— Liabilities Foreign currency forward contracts $0.1 $— $0.1 $— $0.2 $— $0.2 $— $0.1 $— $0.1 $— $0.2 $— $0.2 $— We determine the fair value of our deferred compensation plan assets, comprised of publicly traded securities, by using market quotes as of the last day of the period. The fair value of the foreign currency forward contracts is measured at the value from either directly or indirectly observable third parties. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, and other current assets and liabilities approximate their fair values because of the short-term nature of these instruments. The carrying value of our variable-rate long-term debt approximates fair value. The fair value of the Euro-denominated notes, as observable at commonly quoted intervals (Level 2 inputs), was $939.9 and $831.6 as of December 31, 2017 and 2016 , respectively, compared to a carrying value of $897.8 and $785.2 , respectively. Goodwill and Other Intangible Assets We had goodwill, finite-lived intangible assets and indefinite-lived intangible assets as follows: December 31, 2017 December 31, 2016 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Goodwill (1) $ 1,343.0 $ — $ 1,343.0 $ 1,239.9 $ — $ 1,239.9 Intangible assets: Finite-lived: Customer relationships $ 453.6 $ 325.2 $ 128.4 $ 426.2 $ 287.2 $ 139.0 Other 19.3 14.7 4.6 17.2 12.6 4.6 472.9 339.9 133.0 443.4 299.8 143.6 Indefinite-lived: Tradenames (2) 52.0 — 52.0 52.0 — 52.0 Reacquired franchise rights 99.0 — 99.0 98.8 — 98.8 151.0 — 151.0 150.8 — 150.8 Total intangible assets $ 623.9 $ 339.9 $ 284.0 $ 594.2 $ 299.8 $ 294.4 (1) Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2017 and 2016 . (2) Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2017 and 2016 . Amortization expense related to intangibles was $34.6 , $36.0 and $32.8 in 2017 , 2016 and 2015 , respectively. Amortization expense expected in each of the next five years related to acquisitions completed as of December 31, 2017 is as follows: 2018 - $34.5 , 2019 - $29.7 , 2020 - $24.8 , 2021 - $13.8 and 2022 - $10.2 . The weighted-average useful lives of the customer relationships and other are approximately 13 and 4 years, respectively. The tradenames have been assigned an indefinite life based on our expectation of renewing the tradenames, as required, without material modifications and at a minimal cost, and our expectation of positive cash flows beyond the foreseeable future. The reacquired franchise rights result from our franchise acquisitions in the United States and Canada completed prior to 2009. In accordance with the accounting guidance on goodwill and other intangible assets, we perform an annual impairment test of goodwill at our reporting unit level and indefinite-lived intangible assets at our unit of account level during the third quarter, or more frequently if events or circumstances change that would more likely than not reduce the fair value of our reporting units below their carrying value. We performed our annual impairment test of our goodwill and indefinite-lived intangible assets during the third quarter of 2017 , 2016 and 2015 , and determined that there was no impairment of our goodwill or indefinite-lived intangible as a result of our annual tests. For our goodwill impairment testing procedures, we determined the fair value of each reporting unit generally by utilizing an income approach derived from a discounted cash flow methodology. For certain of our reporting units, a combination of the income approach (weighted 75% ) and the market approach (weighted 25% ) derived from comparable public companies was utilized. The income approach is developed from management’s forecasted cash flow data. Therefore, it represents an indication of fair market value reflecting management’s internal outlook for the reporting unit. The market approach utilizes the Guideline Public Company Method to quantify the respective reporting unit’s fair value based on revenues and earnings multiples realized by similar public companies. The market approach is more volatile as an indicator of fair value as compared to the income approach. We believe that each approach has its merits. However, in the instances where we have utilized both approaches, we have weighted the income approach more heavily than the market approach because we believe that management’s assumptions generally provide greater insight into the reporting unit’s fair value. Significant assumptions used in our goodwill impairment tests during 2017 , 2016 and 2015 included: expected revenue growth rates, operating unit profit margins, working capital levels, discount rates ranging from 10.1% to 13.3% for 2017 , and a terminal value multiple. The expected future revenue growth rates and the expected operating unit profit margins were determined after taking into consideration our historical revenue growth rates and operating unit profit margins, our assessment of future market potential, and our expectations of future business performance. We would record a goodwill impairment charge by the amount for which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of the goodwill. Under the current accounting guidance, we are also required to test our indefinite-lived intangible assets for impairment by comparing the fair value of the intangible asset with its carrying value. If the intangible asset’s fair value is less than its carrying value, an impairment loss is recognized for the difference. Marketable Securities We account for our marketable security investments in accordance with the accounting guidance on investments in debt and equity securities, and have historically determined that all such investments are classified as available-for-sale. Accordingly, unrealized gains and unrealized losses that are determined to be temporary, net of related income taxes, are included in accumulated other comprehensive loss, which is a separate component of shareholders’ equity. Realized gains and losses, and unrealized losses determined to be other-than-temporary, are recorded in our Consolidated Statements of Operations. We hold a 49% interest in our Swiss franchise, accounted for under the equity method of accounting, which maintained an investment portfolio with a market value of $234.8 and $207.0 as of December 31, 2017 and 2016 , respectively. This portfolio is comprised of a wide variety of European and United States debt and equity securities as well as various professionally-managed funds, all of which are classified as available-for-sale. Our share of net realized gains and losses, and declines in value determined to be other-than-temporary, are included in our Consolidated Statements of Operations. For the years ended December 31, 2017 , 2016 and 2015 , realized gains totaled $14.7 , $2.9 and $2.3 , respectively, and realized losses totaled $3.8 , $1.0 and $1.1 , respectively. Other-than-temporary impairment amounts were net gains of $1.6 , $0.3 and $0.2 for 2017, 2016 and 2015, respectively, as previously impaired investments were sold for a gain. Our share of net unrealized gains and unrealized losses that are determined to be temporary related to these investments are included in accumulated other comprehensive loss, with the offsetting amount increasing or decreasing our investment in the franchise. Capitalized Software for Internal Use We capitalize purchased software as well as internally developed software. Internal software development costs are capitalized from the time the internal use software is considered probable of completion until the software is ready for use. Business analysis, system evaluation, selection and software maintenance costs are expensed as incurred. Capitalized software costs are amortized using the straight-line method over the estimated useful life of the software which ranges from 3 to 10 years. The net capitalized software balance of $3.5 and $3.2 as of December 31, 2017 and 2016 , respectively, is included in other assets in the Consolidated Balance Sheets. Amortization expense related to the capitalized software costs was $1.3 , $1.9 and $1.7 for 2017 , 2016 and 2015 , respectively. Property and Equipment A summary of property and equipment as of December 31 is as follows: 2017 2016 Land $ 3.4 $ 5.5 Buildings 14.5 16.2 Furniture, fixtures, and autos 172.3 157.6 Computer equipment 137.1 117.8 Leasehold improvements 306.1 269.9 Property and equipment $ 633.4 $ 567.0 Property and equipment are stated at cost and are depreciated using primarily the straight-line method over the following estimated useful lives: buildings - up to 40 years; furniture, fixtures, autos and computer equipment - 2 to 15 years; leasehold improvements - lesser of life of asset or expected lease term. Expenditures for renewals and betterments are capitalized whereas expenditures for repairs and maintenance are charged to income as incurred. Upon sale or disposition of property and equipment, the difference between the unamortized cost and the proceeds is recorded as either a gain or a loss and is included in our Consolidated Statements of Operations. Long-lived assets are evaluated for impairment in accordance with the provisions of the accounting guidance on the impairment or disposal of long-lived assets. Derivative Financial Instruments We account for our derivative instruments in accordance with the accounting guidance on derivative instruments and hedging activities. Derivative instruments are recorded on the balance sheet as either an asset or liability measured at their fair value. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of the changes in the fair value of the derivative are recorded as a component of accumulated other comprehensive loss and recognized in the Consolidated Statements of Operations when the hedged item affects earnings. The ineffective portions of the changes in the fair value of cash flow hedges are recognized in earnings. Foreign Currency Translation The financial statements of our non-United States subsidiaries have been translated in accordance with the accounting guidance on foreign currency translation. Under the accounting guidance, asset and liability accounts are translated at the current exchange rates and income statement items are translated at the average exchange rates each month. The resulting translation adjustments are recorded as a component of accumulated other comprehensive loss, which is included in shareholders’ equity. A portion of our Euro-denominated notes is accounted for as a hedge of our net investment in our subsidiaries with a Euro-functional currency. For this portion of the Euro-denominated notes, since our net investment in these subsidiaries exceeds the amount of the related borrowings, net of tax, the related translation gains or losses are included as a component of accumulated other comprehensive loss. Shareholders’ Equity In both July 2016 and October 2015, the Board of Directors authorized the repurchase of 6.0 million shares of our common stock. Share repurchases may be made from time to time through a variety of methods, including open market purchases, block transactions, privately negotiated transactions or similar facilities. In 2017, we repurchased a total of 1.9 million shares at a total cost of $203.9 under the 2016 authorization. In 2016, we repurchased a total of 6.6 million shares, comprised of 5.3 million shares under the 2015 authorization and 1.3 million shares under the 2016 authorization, at a total cost of $482.2 . In 2015, we repurchased a total of 6.7 million shares, comprised of 6.0 million shares under a previous authorization and 0.7 million shares under the 2015 authorization, at a total cost of $587.9 , including a nominal amount of shares at a cost of $7.7 that settled in January 2016. The share repurchases that settled in January were not reflected in the treasury stock in our Consolidated Balance Sheets as of December 31, 2015 . As of December 31, 2017 , there were 2.8 million shares remaining authorized for repurchase under the 2016 authorization and no shares remaining under the 2015 authorization. During 2017 , 2016 and 2015 , the Board of Directors declared total cash dividends of $1.86 , $1.72 and $1.60 per share, respectively, resulting in total dividend payments of $123.7 , $118.4 and $121.0 , respectively. Noncontrolling interests, included in total shareholders' equity in our Consolidated Balance Sheets, represent amounts related to majority-owned subsidiaries in which we have a controlling financial interest. Net earnings attributable to these noncontrolling interests were $6.5 , $10.1 and $6.6 for the year ended December 31, 2017 , 2016 and 2015 , respectively, which were recorded as expenses in interest and other expenses in our Consolidated Statements of Operations. Cash and Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Payroll Tax Credit In January 2013, the French government passed legislation, Credit d’Impôt pour la Compétitivité et l’Emploi (“CICE”), that provides payroll tax credits based on a percentage of wages paid to employees receiving less than two-and-a-half times the French minimum wage. The payroll tax credit was equal to 4% of eligible wages in 2013, 6% of eligible wages from 2014 to 2016, and 7% starting in 2017. The CICE payroll tax credit is accounted for as a reduction of our cost of services in the period earned. The payroll tax credit is creditable against our current French income tax payable, with any remaining amount being paid after three years. Given the amount of our current income taxes payable, we would generally receive the vast majority of these payroll tax credits after the three-year period. In March 2017, March 2016 and July 2015, we entered into an agreement to sell a portion of the credits earned in 2016, 2015 and 2014, respectively, for net proceeds of $143.5 ( €133.0 ), $143.1 ( €129.9 ) and $132.8 ( €120.1 ), respectively. We derecognized these receivables upon the sale as the terms of the agreement are such that the transaction qualifies for sale treatment according to the accounting guidance on the transfer and servicing of assets. The discount on the sale of these receivables was recorded in cost of services as a reduction of the payroll tax credits earned in the respective year. Recently Issued Accounting Standards In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers. The core principle of this amendment is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. As amended, the new guidance is effective for us in 2018 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative-effect adjustment as of the date of adoption ("modified retrospective approach"). We have completed our adoption plan and analysis of how we currently recognize revenue compared to the accounting treatment required under the new guidance. This plan included a review of client contracts and revenue transactions to determine the impact of the accounting treatment under the new guidance, evaluation of the adoption method, and completion of a rollout plan for the new guidance. We have concluded that the guidance will not have a material impact on our Consolidated Financial Statements or internal controls other than expanded disclosures. We will adopt the new guidance beginning January 1, 2018 and will use the modified retrospective approach. In January 2016, the FASB issued new accounting guidance on financial instruments. The new guidance requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. This new guidance impacts the accounting for our Swiss franchise's investment portfolio. Upon adoption in January 2018, we will recognize the cumulative unrealized gains or losses in our retained earnings, and subsequently, we will recognize all the fair value adjustments on the investment portfolio in the current period earnings as opposed to other comprehensive loss. As of December 31, 2017 and 2016, we had an unrecognized gain on investments, net of income taxes, of $15.3 and $18.6 , respectively, recorded in accumulated other comprehensive loss. In February 2016, the FASB issued new accounting guidance on leases. The new guidance requires that a lessee recognize assets and liabilities on the balance sheet for leases with lease terms longer than 12 months. The recognition, measurement and presentation of lease expenses and cash flows by a lessee will depend on its classification as a finance or operating lease. The guidance also includes new disclosure requirements providing information on the amounts recorded in the financial statements. The new guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements. In January 2017, the FASB issued new guidance that simplifies the accounting for goodwill impairment. The new guidance removes Step 2 of the current goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. We adopted this guidance effective April 1, 2017, and applied it to our annual impairment test in the third quarter of 2017. Adoption of this guidance had no impact on our Consolidated Financial Statements. In March 2017, the FASB issued new guidance on the presentation of net periodic pension and postretirement benefit cost ("net benefit cost"). Under current GAAP, net benefit cost is reported as an employee cost within operating income. The amendment requires bifurcation of net benefit cost. The service cost component will be presented with other employee compensation cost in operating income or capitalized in assets in rare circumstances. The other components will be reported separately outside of operations, and will not be eligible for capitalization. The guidance is effective for us in 2018 and will be applied retrospectively. Non-service cost components of net benefit cost, which are to be reclassified to interest and other expenses upon adoption of the new guidance, will be a cost of $1.0 and a credit of $5.3 for 2017 and 2016, respectively. In May 2017, the FASB issued new guidance on share-based payment awards. The new guidance clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, vesting conditions or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The guidance is effective for us in 2018. We do not expect the adoption of this guidance to have a material impact on our Consolidated Financial Statements. In August 2017, the FASB issued new guidance on hedge accounting. The amendments in this guidance include the elimination of the concept of recognizing periodic hedge ineffectiveness for cash flow and net investment hedges, recognition and presentation of changes in the fair value of the hedging instrument, recognition and presentation of components excluded from an entity's hedge effectiveness assessment, addition of the ability to elect to perform subsequent effectiveness assessments qualitatively, and addition of new disclosure requirements. The guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements. In February 2018, the FASB issued new guidance on reporting comprehensive income. The new guidance allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. The guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements. Subsequent Events We have evaluated events and transactions occurring after the balance sheet date through our filing date and noted no events that are subject to recognition or disclosure.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions From time to time, we acquire and invest in companies throughout the world, including franchises. The total cash consideration paid for acquisitions, net of cash acquired, for the years ended December 31, 2017 , 2016 and 2015 was $32.7 , $57.6 and $260.5 , respectively. As of December 31, 2017 , goodwill and intangible assets resulting from the 2017 acquisitions were $35.0 and $13.3 , respectively, the majority of which took place in India and Hong Kong. In addition, during the year ended December 31, 2017 , we made payments of $13.0 for contingent consideration related to previous acquisitions, including our 2015 acquisition of 7S Group GmbH (“7S”) in Germany. As of December 31, 2016, goodwill and intangible assets resulting from the 2016 acquisitions were $24.4 and $6.6 , respectively, the majority of which took place in the Netherlands and Norway. During the year ended December 31, 2016, we made payments of $2.9 for contingent consideration related to previous acquisitions. In September 2015, we acquired 7S for total consideration, net of cash acquired, of $140.4 ( €125.3 ) plus contingent consideration of $10.3 ( €9.6 ) paid in the first quarter of 2017 based on the financial results of the company and other factors. In addition, we incurred approximately $3.4 of transaction costs associated with the acquisition during the year ended December 31, 2015, which have been recorded in selling and administrative expenses. Based primarily in Germany, 7S is a highly specialized provider of human resource services focusing on a number of core sectors including skilled trades, engineering and IT. Of the $153.0 ( €136.5 ) of net acquired assets from the 7S acquisition, $48.8 ( €43.5 ) was recorded as finite-lived intangible assets, of which $44.2 ( €39.4 ) was assigned to customer relationships and will be amortized over 10 years using the straight line method. The customer relationships were $36.0 ( €34.2 ) and $36.3 ( €30.2 ) as of December 31, 2016 and 2017, respectively. Total amortization expense related to this intangible asset in each of the next five years is $4.8 . The fair value of $119.1 ( €106.2 ), which was not directly attributable to any specific assets or liabilities, was assigned to goodwill as part of the Germany reporting unit.

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Plans	Share-Based Compensation Plans We account for share-based payments according to the accounting guidance on share-based payments. During 2017 , 2016 and 2015 , we recognized $28.7 , $27.1 and $31.1 , respectively, in share-based compensation expense related to stock options, deferred stock, restricted stock and performance share units, all of which is recorded in selling and administrative expenses. Consideration received from share-based awards for 2017 , 2016 and 2015 was $44.2 , $19.7 and $70.1 , respectively. In January 2017, we adopted the new accounting guidance on share-based payments. This guidance requires all excess tax benefits and tax deficiencies from share-based compensation to be recognized on a prospective basis as income tax expense or benefit in the income statement rather than capital in excess of par value. The guidance also requires the excess tax benefit or deficiency to be classified as an operating activity rather than a financing activity in our Consolidated Statements of Cash Flows. To eliminate diversity in practice, the guidance also requires that cash payments to tax authorities in connection with shares withheld to meet employees' statutory tax withholding requirements are to be included retrospectively, for all periods presented, as financing activities in our Consolidated Statements of Cash Flows, consistent with our methodology. The total income tax benefit recognized related to share-based compensation during 2017 , 2016 and 2015 was $23.7 , $7.4 and $16.9 , respectively. Included in the 2017 amount was an excess tax benefit of $6.2 , or $0.09 per share, that would have been recorded in capital in excess of par value prior to the adoption of the new accounting guidance. The excess income tax benefit recognized related to share-based compensation awards, which was recorded in capital in excess of par value in 2016 and 2015 was approximately $0.8 and $7.4 , respectively. We recognize compensation expense on grants of share-based compensation awards on a straight-line basis over the vesting period of each award. Stock Options All share-based compensation is granted under the 2011 Equity Incentive Plan of Manpower Inc. (“2011 Plan”). Options and stock appreciation rights are granted at a price not less than 100% of the fair market value of the common stock at the date of grant. Generally, options are granted with a ratable vesting period of up to four years and expire ten years from date of grant. No stock appreciation rights had been granted or were outstanding as of December 31, 2017 or 2016 . A summary of stock option activity is as follows: Shares (000) Wtd. Avg. Exercise Price Per Share Wtd. Avg. Remaining Contractual Term (years) Aggregate Intrinsic Value (in millions) Outstanding, January 1, 2015 2,484 $59 Granted 147 77 Exercised (1,255 ) 56 $39 Expired or cancelled (104 ) 56 Outstanding, December 31, 2015 1,272 $64 5.2 $26 Vested or expected to vest, December 31, 2015 1,267 $64 5.2 Exercisable, December 31, 2015 911 $62 4.0 $20 Outstanding, January 1, 2016 1,272 $64 Granted 166 75 Exercised (279 ) 63 $5 Expired or cancelled (32 ) 67 Outstanding, December 31, 2016 1,127 $66 4.9 $26 Vested or expected to vest, December 31, 2016 1,122 $66 4.9 Exercisable, December 31, 2016 756 $62 3.3 $20 Outstanding, January 1, 2017 1,127 $66 Granted 145 97 Exercised (680 ) 64 $24 Expired or cancelled (18 ) 75 Outstanding, December 31, 2017 574 $77 7.1 $28 Vested or expected to vest, December 31, 2017 571 $77 7.1 Exercisable, December 31, 2017 220 $65 5.3 $14 Options outstanding and exercisable as of December 31, 2017 were as follows: Options Outstanding Options Exercisable Exercise Price Shares (000) Weighted- Average Remaining Contractual Life (years) Weighted- Average Exercise Price Shares (000) Weighted-Average Exercise Price $27-$49 35 2.8 $39 35 $39 $50-$59 59 3.8 53 59 53 $60-$75 163 7.8 75 39 73 $76-$97 317 7.8 87 87 78 574 7.1 $77 220 $65 We have recognized expense of $3.7 , $3.0 and $3.2 related to stock options for the years ended December 31, 2017 , 2016 and 2015 , respectively. The total fair value of options vested during the same periods was $2.3 , $2.5 and $3.2 , respectively. As of December 31, 2017 , total unrecognized compensation cost was approximately $2.3 , net of estimated forfeitures, which we expect to recognize over a weighted-average period of approximately 1.2 years. We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions: Year Ended December 31 2017 2016 2015 Average risk-free interest rate 2.0 % 1.4 % 1.6 % Expected dividend yield 2.0 % 2.1 % 1.5 % Expected volatility 31.0 % 33.0 % 32.0 % Expected term (years) 6.0 6.0 6.0 The average risk-free interest rate is based on United States Treasury security rates corresponding to the expected term in effect as of the grant date. The expected dividend yield is based on the expected annual dividend as a percentage of the market value of our common stock as of the grant date. We determined expected volatility using a weighted average of daily historical volatility (weighted 75% ) of our stock price over the past five years and implied volatility (weighted 25% ) based upon exchange traded options for our common stock. We believe that a blend of historical volatility and implied volatility better reflects future market conditions and better indicates expected volatility than considering purely historical volatility. We determined the expected term of the stock options using historical data. The weighted-average grant-date fair value per option granted during the year was $25.58 , $19.68 and $21.66 in 2017 , 2016 and 2015 , respectively. Deferred Stock Our non-employee directors may elect to receive deferred stock in lieu of part or all of their annual cash retainer otherwise payable to them. The number of shares of deferred stock is determined pursuant to a formula set forth in the terms and conditions adopted under the 2011 Plan; the deferred stock is settled in shares of common stock according to these terms and conditions. As of December 31, 2017 , 2016 and 2015 , there were 43,442 , 39,805 and 36,091 , respectively, shares of deferred stock awarded under this arrangement, all of which are vested. Non-employee directors also receive an annual grant of deferred stock (or restricted stock, if they so elect) as additional compensation for board service. The award vests in equal quarterly installments over one year and the vested portion of the deferred stock is settled in shares of common stock either upon a director’s termination of service or three years after the date of grant (which may in most cases be extended at the directors’ election) in accordance with the terms and conditions under the 2011 Plan. As of December 31, 2017 , 2016 and 2015 , there were 9,857 , 8,388 and 7,920 , respectively, shares of deferred stock and 9,792 , 9,966 and 13,860 , respectively, shares of restricted stock granted under this arrangement, all of which are vested except for 1,752 shares of restricted stock granted in 2015 that were cancelled. We recognized expense of $1.4 , $1.1 and $0.8 related to deferred stock in 2017 , 2016 and 2015 , respectively. Restricted Stock We grant restricted stock and restricted stock unit awards to certain employees and to non-employee directors who may elect to receive restricted stock rather than deferred stock as described above. Restrictions lapse over periods ranging up to six years, and in some cases upon retirement. We value restricted stock awards at the closing market value of our common stock on the date of grant. A summary of restricted stock activity is as follows: Shares (000) Wtd. Avg. Price Per Share Wtd. Avg. Remaining Contractual Term (years) Aggregate Intrinsic Value (in millions) Unvested, January 1, 2015 463 $57 1.2 Granted 179 76 Vested (217 ) 59 Forfeited (20 ) 60 Unvested, December 31, 2015 405 $64 1.3 Granted 232 $75 Vested (172 ) 62 Forfeited (14 ) 76 Unvested, December 31, 2016 451 $70 1.4 Granted 167 $98 Vested (133 ) 79 Forfeited (37 ) 80 Unvested, December 31, 2017 448 $77 1.2 $56 During 2017 , 2016 and 2015 , we recognized $12.3 , $13.8 and $9.9 , respectively, of expense related to restricted stock awards. As of December 31, 2017 , there was approximately $14.3 of total unrecognized compensation cost related to unvested restricted stock, which we expect to recognize over a weighted-average period of approximately 1.9 years. Performance Share Units Our 2011 Plan allows us to grant performance share units. We grant performance share units with a performance period ranging from one to three years. Vesting of units occurs at the end of the performance period or after a subsequent holding period, except in the case of termination of employment where the units are forfeited immediately. Upon retirement, a prorated number of units vest depending on the period worked from the grant date to retirement date or in certain cases all of the units vest. In the case of death or disability, the units immediately vest at the Target Award level if the death or disability date is during the performance period, or at the level determined by the performance criteria met during the performance period if the death or disability occurs during the subsequent holding period. The units are settled in shares of our common stock. A payout multiple is applied to the units awarded based on the performance criteria determined by the Executive Compensation and Human Resources Committee of the Board of Directors at the time of grant. In the event the performance criteria exceeds the Target Award level, an additional number of shares, up to the Outstanding Award level, may be granted. In the event the performance criteria falls below the Target Award level, a reduced number of shares, as low as the Threshold Award level, may be granted. If the performance criteria falls below the Threshold Award level, no shares will be granted. A summary of the performance share units detail by grant year is as follows: 2014 2015 2016 2017 Grant Date(s) February 11, February 11, 2015 February 16, 2016 February 9, 2017 Performance Period (years) 2014-2016 2015-2017 2016-2018 2017-2019 Vesting Date February 2017 February 2018 (a) February 2019 (a) February 2020 (a) Payout Levels (in units): Threshold Award 94,608 82,298 65,141 57,563 Target Award 189,215 164,595 130,282 115,125 Outstanding Award 378,430 329,190 260,564 230,250 Shares Issued in 2017 335,179 — — — Payout Achieved Over Performance Period — 219,519 — — (a) 2015, 2016 and 2017 awards are scheduled to vest in February 2018, 2019, and 2020, respectively, when the Executive Compensation and Human Resources Committee of the Board of Directors determines the achievement of the performance criteria. We recognize and adjust compensation expense based on the likelihood of the performance criteria specified in the award being achieved. The compensation expense is recognized over the performance and holding periods and is recorded in selling and administrative expenses. We have recognized total compensation expense of $10.8 , $9.1 and $17.1 in 2017 , 2016 and 2015 , respectively, related to the performance share units. Other Stock Plans Under the 1990 Employee Stock Purchase Plan, designated employees meeting certain service requirements may purchase shares of our common stock through payroll deductions. These shares may be purchased at their fair market value on a monthly basis. The current plan is non-compensatory according to the accounting guidance on share-based payments. We also maintain the Savings Related Share Option Scheme for United Kingdom employees with at least one year of service. The employees are offered the opportunity to obtain an option for a specified number of shares of common stock at not less than 85% of its market value on the day prior to the offer to participate in the plan. Options vest after either three , five or seven years, but may lapse earlier. Funds used to purchase the shares are accumulated through specified payroll deductions over a 60 -month period. We recognized an expense of $0.5 for shares purchased under the plan in 2017 , and an expense of $0.1 for shares purchased under the plan in both 2016 and 2015 .

Net Earnings Per Share

Net Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Earnings Per Share	Net Earnings Per Share The calculation of net earnings per share - basic and net earnings per share - diluted were as follows: Year Ended December 31 2017 2016 2015 Net earnings available to common shareholders: $545.4 $443.7 $419.2 Weighted-average common shares outstanding (in millions): Weighted-average common shares outstanding - basic 67.1 70.1 76.8 Effect of dilutive securities - stock options 0.2 0.2 0.5 Effect of other share-based awards 0.6 0.5 0.4 Weighted-average common shares outstanding - diluted 67.9 70.8 77.7 Net earnings per share - basic $8.13 $6.33 $5.46 Net earnings per share - diluted $8.04 $6.27 $5.40 There were no share-based awards excluded from the calculation of net earnings per share - diluted for the year ended December 31, 2017 , however there were certain share-based awards excluded for the year ended December 31, 2016 and 2015 , respectively, as the exercise prices for these awards were greater than the average market price of the common shares during the period. The number, exercise prices and weighted-average remaining life of these antidilutive awards were as follows: 2017 2016 2015 Shares (in thousands) — 20 20 Exercise price $— $93 $93 Weighted-average remaining life 0.0 years 0.4 years 1.4 years

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017 , the United States enacted the Tax Act, which made broad changes to the tax code including a reduction of the United States federal corporate income tax rate from 35% to 21% effective January 1, 2018 as well as a transition to a Territorial Tax regime. The key provisions of the Tax Act and their related impacts, which totaled a $77.2 tax benefit, are as follows: • The deferred tax liability previously recorded for non-United States earnings that are not permanently invested was reduced with a corresponding benefit to tax expense of $275.8 . This is comprised of the deferred tax liability recorded as of December 22, 2017, offset by $5.5 of tax expense related to non-United States withholding tax. The reporting for these amounts is provisional as we continue to evaluate various aspects of the Tax Act and gather additional information on our non-United States earnings. • As part of the transition to a Territorial Tax regime, a tax was imposed on our unremitted post-1986 non-United States earnings. We have currently estimated and recorded this transition tax expense at $170.2 , which is a provisional estimate of the amount due and may change as additional guidance becomes available. The tax is payable in installments over eight years beginning April 2018 with 8 percent of the liability due in each of the first five years, 15 percent due in year six , 20 percent due in year seven and the remaining 25 percent due in year eight . In addition to the transition tax, certain foreign tax credit benefits were disallowed resulting in tax expense of $3.8 . • The impact of the Tax Act on our deferred tax assets and liabilities balance, excluding the provision for unremitted earnings, was a tax expense of $1.2 . The reporting for this amount is provisional as we continue to evaluate the state-level impacts of the Tax Act and other matters. • The Tax Act negatively impacted our prior year unrecognized tax benefits resulting in tax expense of $23.4 . The reporting for this amount is complete. • The Tax Act creates a new Global Intangible Low-Taxed Income (“GILTI”) tax regime. Under GILTI, income earned after December 31, 2017 by certain non-United States subsidiaries must be included currently in the gross income of the United States parent company. Because of the complexity of the new GILTI tax rules and lack of guidance as to how to calculate the tax, we are continuing to evaluate this provision of the Tax Act and its impact on us. In accordance with accounting guidance on income taxes, we are allowed to make an accounting policy choice of either (1) treating taxes due on future inclusions in taxable income related to GILTI as a current-period expense (the “period cost method”) or (2) considering such amounts into a company’s measurement of its deferred taxes (the “deferred method”). When additional guidance is available, we will make a policy decision regarding whether to record deferred taxes on GILTI. French tax reform was also enacted at the end of December 2017, which will gradually reduce the French corporate income tax rate from the current 33.3% , without surtax, to 25% in 2022. We have reduced the value of our French deferred tax assets to recognize the lower realization of future tax deductions. The tax expense related to this revaluation was $3.5 for 2017. The provision for income taxes was as follows: Year Ended December 31 2017 2016 2015 Current United States Federal $211.7 $35.6 ($8.4 ) State 8.4 4.0 — Non-United States 168.6 144.0 158.7 Total current 388.7 183.6 150.3 Deferred United States Federal (178.2 ) 69.7 92.9 State (0.8 ) 0.5 1.8 Non-United States (17.8 ) 3.8 (3.5 ) Total deferred (196.8 ) 74.0 91.2 Total provision $191.9 $257.6 $241.5 Increase in the current United States federal tax expense is due to the transition tax expense resulting from the Tax Act. The change in the deferred United States federal tax benefit is due to the reversal of our deferred tax liability related to non-United States earnings that were deemed to be not permanently invested as a result of the Tax Act. A reconciliation between taxes computed at the United States federal statutory rate of 35% and the consolidated effective tax rate is as follows: Year Ended December 31 2017 2016 2015 Income tax based on statutory rate $258.1 $245.5 $231.2 Increase (decrease) resulting from: Non-United States tax rate difference: French business tax (1) 46.9 41.0 40.0 French CICE (2) (77.1 ) — — Other (2) (28.6 ) (23.5 ) (19.6 ) Repatriation of non-United States earnings (2)(3) 69.7 (10.5 ) (16.9 ) State income taxes, net of federal benefit 1.1 2.2 2.7 Change in valuation allowance (6.9 ) (6.0 ) 3.3 United States Tax Act and French tax reform (3) (73.7 ) — — Other, net 2.4 8.9 0.8 Tax provision $191.9 $257.6 $241.5 (1) The French business tax is allowed as a deduction for French income tax purposes. The gross amount of the French business tax was $72.1 , $63.1 and $61.5 for 2017, 2016 and 2015, respectively. The amounts in the table above of $46.9 , $41.0 and $40.0 , respectively, represent the French business tax expense net of the French tax benefit. (2) The French CICE is a payroll tax credit that is tax-free for French tax purposes and increases French earnings. The French tax benefits related to the CICE were $58.9 and $56.2 for 2016 and 2015, respectively. Prior to the Tax Act, this increase in French earnings resulted in a United States tax expense as these French earnings were deemed to be not permanently invested, which is included in Repatriations of non-United States earnings. Included in Other Non-United States tax rate differences are benefits of $2.4 , $1.8 and $1.5 for 2017, 2016 and 2015, respectively, that relate to French earnings that are deemed to be permanently invested. (3) Prior to the enactment of the Tax Act on December 22, 2017, we recorded $83.3 of tax expense in 2017 related to non-United States earnings that were deemed to be not permanently invested. This amount is included in the Repatriation of non-United States earnings consistent with prior years. As a result of the Tax Act, this $83.3 was reversed as we are no longer recording United States federal income tax expense on these earnings, and this tax benefit is included in the United States Tax Act and French tax reform benefit of $73.7 . Deferred income taxes are recorded based on temporary differences at the tax rate expected to be in effect when the temporary differences reverse. The Tax Act significantly impacted our deferred income taxes. Temporary differences, which give rise to the deferred taxes, are as follows: December 31 2017 2016 Future Income Tax Benefits (Expense) Accrued payroll taxes and insurance $17.3 $30.6 Employee compensation payable 20.2 26.6 Pension and postretirement benefits 49.0 60.7 Intangible assets (103.0 ) (146.8 ) Repatriation of non-United States earnings (5.5 ) (164.8 ) Intercompany loans denominated in foreign currencies (13.5 ) (74.2 ) Net operating losses 104.1 92.7 Other 77.6 120.7 Valuation allowance (77.5 ) (86.3 ) Total future tax benefits (expense) $68.7 ($140.8 ) Deferred tax asset $101.0 $81.4 Deferred tax liability (32.3 ) (222.2 ) Total future tax benefits (expense) $68.7 ($140.8 ) Pre-tax earnings of non-United States operations were $514.9 , $482.2 and $511.2 in 2017 , 2016 and 2015 , respectively. As of December 31, 2017 , provisional deferred taxes related to non-United States withholding taxes were provided on $1,746.3 of unremitted earnings of non-United States subsidiaries that may be remitted to the United States. We have an additional $264.3 of unremitted earnings of non-United States subsidiaries for which we have not currently provided deferred taxes. As of December 31, 2017 and 2016 , we have recorded a deferred tax liability of $5.5 and $164.8 , respectively, related to these non-United States earnings that may be remitted. The deferred tax liability decreased as we have no longer provided United States federal income taxes on unremitted earnings of non-United States subsidiaries that are not considered permanently invested. We had United States federal and non-United States net operating loss carryforwards and United States state net operating loss carryforwards totaling $401.2 and $198.7 , respectively, as of December 31, 2017 . The net operating loss carryforwards expire as follows: United States Federal and Non-United States United States State 2018 $1.5 $3.0 2019 6.5 4.0 2020 3.3 0.2 2021 5.3 3.8 2022 3.4 — Thereafter 25.0 187.7 No expirations 356.2 — Total net operating loss carryforwards $401.2 $198.7 We have recorded a deferred tax asset of $104.1 as of December 31, 2017 , for the benefit of these net operating losses. Realization of this asset is dependent on generating sufficient taxable income prior to the expiration of the loss carryforwards. A related valuation allowance of $68.4 has been recorded as of December 31, 2017 , as management believes that realization of certain net operating loss carryforwards is unlikely. As of December 31, 2017 , we had gross unrecognized tax benefits related to various tax jurisdictions, including interest and penalties, of $66.5 that would favorably affect the effective tax rate if recognized. Our prior year unrecognized tax benefits were negatively impacted by the Tax Act during 2017. We do not expect our unrecognized tax benefits to change significantly over the next year. As of December 31, 2016 , we had gross unrecognized tax benefits related to various tax jurisdictions, including interest and penalties, of $44.0 . We recognize accrued interest and penalties related to unrecognized tax benefits in income tax expense. We accrued net interest and penalties of $0.2 , $0.3 and $12.1 in 2017 , 2016 and in 2015 , respectively. The following table summarizes the activity related to our unrecognized tax benefits during 2017 , 2016 and 2015 : 2017 2016 2015 Gross unrecognized tax benefits, beginning of year $23.8 $19.0 $23.0 Increases in prior year tax positions 27.1 4.1 2.3 Decreases in prior year tax positions (1.2 ) (1.7 ) (0.5 ) Increases for current year tax positions 6.6 4.1 3.1 Expiration of statute of limitations and audit settlements (10.2 ) (1.7 ) (8.9 ) Gross unrecognized tax benefits, end of year $46.1 $23.8 $19.0 Potential interest and penalties 20.4 20.2 19.9 Balance, end of year $66.5 $44.0 $38.9 We conduct business globally in various countries and territories. We are routinely audited by the tax authorities of the various tax jurisdictions in which we operate. Generally, the tax years that could be subject to examination are 2010 through 2017 for our major operations in France, Germany, Japan, the United Kingdom and the United States. As of December 31, 2017 , we were subject to tax audits in Austria, Canada, Denmark, France, Germany, Italy and the United States. We believe that the resolution of these audits will not have a material impact on earnings.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Changes in the carrying value of goodwill by reportable segment and Corporate were as follows: Americas (1) Southern Europe (2) Northern Europe APME Right Management Corporate (3) Total (4) Balance, January 1, 2016 $ 515.7 $ 97.2 $ 441.9 $ 75.6 $ 62.1 $ 64.9 $ 1,257.4 Goodwill acquired — — 22.3 1.5 — 0.6 24.4 Currency impact and other 0.7 (0.2 ) (42.3 ) (0.1 ) — — (41.9 ) Balance, December 31, 2016 516.4 97.0 421.9 77.0 62.1 65.5 1,239.9 Goodwill acquired — 10.0 0.1 24.9 — — 35.0 Currency impact and other 2.8 14.9 46.1 4.3 — — 68.1 Balance, December 31, 2017 $ 519.2 $ 121.9 $ 468.1 $ 106.2 $ 62.1 $ 65.5 $ 1,343.0 (1) Balances related to United States were $476.9 , $476.5 and $476.5 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. (2) Balances related to France were $69.0 , $66.8 and $76.3 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. Balances related to Italy were $4.5 , $4.4 and $5.0 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. (3) The majority of the Corporate balance as of December 31, 2017 relates to goodwill attributable to our acquisition of Jefferson Wells ( $55.5 ) which is part of the United States reporting unit. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See the table below for the breakout of goodwill balances by reporting unit. (4) Balances were net of accumulated impairment loss of $513.4 as of January 1, 2016 , December 31, 2016 and December 31, 2017 . Goodwill balances by reporting unit were as follows: December 31 2017 2016 United States $532.0 $532.0 Germany 135.4 121.4 Netherlands 126.5 110.9 United Kingdom 89.2 81.4 France 76.3 66.8 Right Management 62.1 62.1 Other reporting units 321.5 265.3 Total goodwill $1,343.0 $1,239.9

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Information concerning short-term borrowings is as follows: December 31 2017 2016 Short-term borrowings $49.1 $39.5 Weighted-average interest rates 7.9 % 11.1 % We maintain separate bank credit lines with financial institutions to meet working capital needs of our subsidiary operations. As of December 31, 2017 , such uncommitted credit lines totaled $324.1 , of which $274.4 was unused. Under our revolving credit agreement, total subsidiary borrowings cannot exceed $300.0 in the first, second and fourth quarters, and $600.0 in the third quarter of each year. A summary of long-term debt is as follows: December 31 2017 2016 Euro-denominated notes: €400 due September 2022 $477.8 $417.7 €350 due June 2018 420.0 367.5 Other 0.6 0.7 898.4 785.9 Less - current maturities 420.3 0.3 Long-term debt $478.1 $785.6 Euro Notes On September 11, 2015, we offered and sold €400.0 aggregate principal amount of the Company's 1.875% notes due September 11, 2022 (the "€400.0 Notes"). The net proceeds from the €400.0 Notes of €397.4 were used for general corporate purposes, including share repurchases and the acquisition of or investment in complementary businesses or other assets. The €400.0 Notes were issued at a price of 99.753% to yield an effective interest rate of 1.913% . Interest on the €400.0 Notes is payable in arrears on September 11 of each year. We may redeem the €400.0 Notes, in whole but not in part, at our option at any time for a redemption price determined in accordance with the term of the €400.0 Notes. We also have €350.0 aggregate principal amount 4.50% notes due June 22, 2018 (the “€350.0 Notes”), which were issued at a price of 99.974% to yield an effective interest rate of 4.505% . Interest on the €350.0 Notes is payable in arrears on June 22 of each year. We may redeem the €350.0 Notes, in whole but not in part, at our option at any time for a redemption price determined in accordance with the term of the €350.0 Notes. When the €400.0 Notes and €350.0 Notes mature, we plan to repay the amounts with available cash, borrowings under our $600.0 revolving credit facility or a new borrowing. The credit terms, including interest rate and facility fees, of any replacement borrowings will be dependent upon the condition of the credit markets at that time. We currently do not anticipate any problems accessing the credit markets should we decide to replace either the €400.0 Notes or the €350.0 Notes. Both the €400.0 Notes and €350.0 Notes contain certain customary non-financial restrictive covenants and events of default and are unsecured senior obligations and rank equally with all of our existing and future senior unsecured debt and other liabilities. A portion of these notes has been designated as a hedge of our net investment in subsidiaries with a Euro-functional currency as of December 31, 2017. For this portion of the Euro-denominated notes, since our net investment in these subsidiaries exceeds the respective amount of the designated borrowings, the related translation gains or losses are included as a component of accumulated other comprehensive loss. (See Note 12 to the Consolidated Financial Statements for further information.) Revolving Credit Agreement We have a Five Year Credit Agreement (the “Credit Agreement”) with a syndicate of commercial banks with a termination date of September 16, 2020. The Credit Agreement allows for borrowing of $600.0 in various currencies, and up to $150.0 may be used for the issuance of stand-by letters of credit. We had no borrowings under this facility as of both December 31, 2017 and 2016 . Outstanding letters of credit issued under the Credit Agreement totaled $0.8 as of both December 31, 2017 and 2016 . Additional borrowings of $599.2 were available to us under the facility as of both December 31, 2017 and 2016 . Under the Credit Agreement, a credit ratings-based pricing grid determines the facility fee and the credit spread that we add to the applicable interbank borrowing rate on all borrowings. At our current credit rating, the annual facility fee is 12.5 basis points paid on the entire facility and the credit spread is 100.0 basis points on any borrowings. The Credit Agreement contains customary restrictive covenants pertaining to our management and operations, including limitations on the amount of subsidiary debt that we may incur and limitations on our ability to pledge assets, as well as financial covenants requiring, among other things, that we comply with a leverage ratio (Net Debt-to-Net Earnings before interest and other expenses, provision for income taxes, intangible asset amortization expense, depreciation and amortization expense ("EBITDA")) of not greater than 3.5 to 1 and a fixed charge coverage ratio of not less than 1.5 to 1. The Credit Agreement also contains customary events of default, including, among others, payment defaults, material inaccuracy of representations and warranties, covenant defaults, bankruptcy or involuntary proceedings, certain monetary and non-monetary judgments, change of control and customary ERISA defaults. Debt Maturities The maturities of long-term debt payable within each of the four years subsequent to December 31, 2018 are as follows: 2019 — $0.3 , 2020 — $0.0 , 2021 — $0.0 , 2022 — $477.8 .

Retirement and Deferred Compens

Retirement and Deferred Compensation Plans	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Retirement and Deferred Compensation Plans	Retirement and Deferred Compensation Plans For all of our United States defined benefit and retiree health care plans, we adopted the Society of Actuaries’ RP-2006 mortality table with MP-2017 projection scale in determining the plans’ benefit obligations as of December 31, 2017. Beginning in 2016, we changed the method we use to estimate the service and interest cost components of net periodic benefit cost for all of our United States defined benefit plans. Historically, the service and interest cost components had been estimated utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the year. Starting 2016, we have utilized a full yield curve approach to estimate these components by applying specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows. We made this change to improve the correlation between projected benefit cash flows and the corresponding yield curve spot rates and to provide a more precise measurement of service and interest costs. Defined Benefit Pension Plans We sponsor several qualified and nonqualified pensi on plans covering permanent employees. During 2016, we transitioned an additional German plan associated with the employees who were transferred in as part of a new client contract. The unfunded portion of this plan was $61.8 and $56.8 as of December 31, 2017 and 2016, respectively, which will be partially funded by the client at the end of the contract. We have received a bank guarantee to cover the counterparty risk associated with this unfunded amount. The reconciliation of the changes in the plans’ benefit obligations and the fair value of plan assets and the funded status of the plans are as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Change in Benefit Obligation Benefit obligation, beginning of year $53.1 $53.1 $416.0 $326.1 Service cost — — 10.1 8.0 Interest cost 1.7 1.8 8.9 10.0 Curtailment and settlement — — — (29.0 ) Transfers — — 9.3 105.4 Actuarial loss 3.0 2.2 1.0 39.8 Plan participant contributions — — 0.2 0.2 Benefits paid (4.1 ) (4.0 ) (9.5 ) (7.7 ) Currency exchange rate changes — — 53.5 (36.8 ) Benefit obligation, end of year $53.7 $53.1 $489.5 $416.0 United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Change in Plan Assets Fair value of plan assets, beginning of year $37.3 $37.2 $324.5 $314.7 Actual return on plan assets 3.0 1.7 13.4 44.6 Settlement — — — (26.1 ) Transfers — — 1.8 34.9 Plan participant contributions — — 0.2 0.2 Company contributions 2.5 2.4 7.9 0.5 Benefits paid (4.1 ) (4.0 ) (9.5 ) (7.7 ) Currency exchange rate changes — — 38.4 (36.6 ) Fair value of plan assets, end of year $38.7 $37.3 $376.7 $324.5 Funded Status at End of Year Funded status, end of year ($15.0 ) ($15.8 ) ($112.8 ) ($91.5 ) Amounts Recognized Noncurrent assets $15.3 $14.3 $36.8 $30.4 Current liabilities (2.5 ) (2.5 ) (0.4 ) (0.8 ) Noncurrent liabilities (27.8 ) (27.6 ) (149.2 ) (121.1 ) Net amount recognized ($15.0 ) ($15.8 ) ($112.8 ) ($91.5 ) Amounts recognized in accumulated other comprehensive loss, net of tax, consisted of: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Net loss $13.9 $13.0 $29.9 $32.7 Prior service cost — — 6.7 4.7 Total $13.9 $13.0 $36.6 $37.4 The accumulated benefit obligation for our plans that have plan assets was $433.0 and $377.0 as of December 31, 2017 and 2016 , respectively. The accumulated benefit obligation for certain of our plans exceeded the fair value of plan assets as follows: December 31 2017 2016 Accumulated benefit obligation $135.9 $107.9 Plan assets 65.5 47.9 The projected benefit obligation for certain of our plans exceeded the fair value of plan assets as follows: December 31 2017 2016 Projected benefit obligation $143.8 $113.9 Plan assets 65.5 47.9 By their nature, certain of our plans do not have plan assets. The accumulated benefit obligation for these plans was $86.7 and $74.3 as of December 31, 2017 and 2016 , respectively. The components of the net periodic benefit cost and other amounts recognized in other comprehensive loss for all plans were as follows: Year Ended December 31 2017 2016 2015 Net Periodic Benefit Cost Service cost $10.1 $8.0 $7.2 Interest cost 10.6 11.8 12.7 Expected return on assets (10.8 ) (10.9 ) (12.9 ) Curtailment and settlement — (6.9 ) — Net loss 0.9 1.0 4.0 Prior service cost 0.4 0.4 0.4 Net periodic benefit cost 11.2 3.4 11.4 Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss Net (gain) loss (1.5 ) 24.7 (22.9 ) Prior service cost 2.9 — — Amortization of net loss (0.9 ) (1.0 ) (4.0 ) Amortization of prior service cost (0.4 ) (0.4 ) (0.4 ) Total recognized in other comprehensive loss 0.1 23.3 (27.3 ) Total recognized in net periodic benefit cost and other comprehensive income/loss $11.3 $26.7 ($15.9 ) Effective July 1, 2016, we terminated a defined benefit plan in Northern Europe and transitioned our employees to a defined contribution plan, resulting in a curtailment and settlement gain of $6.9 . The estimated net loss and prior service cost for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2018 are $0.8 and $0.6 , respectively. The weighted-average assumptions used in the measurement of the benefit obligation were as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Discount rate 3.6 % 4.0 % 2.1 % 2.2 % Rate of compensation increase 3.0 % 3.0 % 1.9 % 1.7 % The weighted-average assumptions used in the measurement of the net periodic benefit cost were as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2015 2017 2016 2015 Discount rate - service cost 4.1 % 4.4 % 3.9 % 2.2 % 3.2 % 2.9 % Discount rate - interest cost 3.3 % 3.4 % 3.9 % 2.2 % 3.2 % 2.9 % Expected long-term return on plan assets 4.8 % 5.3 % 5.5 % 2.8 % 3.4 % 3.2 % Rate of compensation increase 3.0 % 3.0 % 3.0 % 1.7 % 2.2 % 2.6 % We determine our assumption for the discount rate based on an index of high-quality corporate bond yields and matched-funding yield curve analysis as of the end of each fiscal year. Our overall expected long-term rate of return used in the measurement of the 2017 net periodic benefit cost on United States plan assets was 4.8% , while the rates of return on our non-United States plans varied by country and ranged from 1.3% to 4.0% . For a majority of our plans, a building block approach has been employed to establish this return. Historical markets are studied and long-term historical relationships between equity securities and fixed income instruments are preserved consistent with the widely accepted capital market principle that assets with higher volatility generate a greater return over time. Current market factors such as inflation and interest rates are evaluated before long-term capital market assumptions are determined. The long-term portfolio return is established with proper consideration of diversification and rebalancing. We also use guaranteed insurance contracts for four of our foreign plans. Peer data and historical returns are reviewed to check for reasonableness and appropriateness of our expected rate of return. Projected salary levels utilized in the determination of the projected benefit obligation for the pension plans are based upon historical experience and the future expectations for each respective country. Our plans’ investment policies are to optimize the long-term return on plan assets at an acceptable level of risk and to maintain careful control of the risk level within each asset class. Our long-term objective is to minimize plan expenses and contributions by outperforming plan liabilities. We have historically used a balanced portfolio strategy based primarily on a target allocation of equity securities and fixed-income instruments, which vary by location. These target allocations, which are similar to the 2017 allocations, are determined based on the favorable risk tolerance characteristics of the plan and, at times, may be adjusted within a specified range to advance our overall objective. The fair values of our pension plan assets are primarily determined by using market quotes and other relevant information that is generated by market transactions involving identical or comparable assets, except for the insurance contracts, which are measured at the present value of expected future benefit payments primarily using the Deutsche National Bank interest curve. The fair value of our pension plan assets by asset category was as follows: United States Plans Non-United States Plans Fair Value Measurements Using Fair Value Measurements Using December 31, 2017 Quoted Significant Significant December 31, 2017 Quoted Significant Significant Asset Category Cash and cash equivalents (1) $0.2 $— $0.2 $— $5.1 $5.1 $— $— Equity securities: United States companies 12.3 12.3 — — 15.2 15.2 — — International companies — — — — 35.7 35.7 — — Fixed income securities: Government bonds (2) 15.2 — 15.2 — 45.2 — 45.2 — Corporate bonds 11.0 — 11.0 — 59.8 — 59.8 — Guaranteed insurance contracts — — — — 17.6 — 17.6 — Annuity contract — — — — 55.3 — 55.3 — Other types of investments: Unitized funds (3) — — — — 25.8 25.8 — — Real estate funds — — — — 8.2 — 8.2 — Insurance contracts — — — — 108.8 — — 108.8 $38.7 $12.3 $26.4 $— $376.7 $81.8 $186.1 $108.8 (1)This category includes a prime obligations money market portfolio. (2)This category includes United States Treasury/Federal agency securities and foreign government securities. (3)This category includes investments in approximately 60% equity securities, 30% fixed income securities and 10% cash. United States Plans Non-United States Plans Fair Value Measurements Using Fair Value Measurements Using December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2016 Quoted Significant Significant Asset Category Cash and cash equivalents (1) $0.2 $— $0.2 $— $9.7 $9.2 $0.5 $— Equity securities: United States companies 12.1 12.1 — — — — — — International companies — — — — 17.7 17.7 — — Fixed income securities: Government bonds (2) 14.7 — 14.7 — 27.5 — 27.5 — Corporate bonds 10.3 — 10.3 — 49.6 — 49.6 — Guaranteed insurance contracts — — — — 14.2 — 14.2 — Annuity contract — — — — 49.5 — 49.5 — Other types of investments: Unitized funds (3) — — — — 23.1 23.1 — — Real estate funds — — — — 7.0 — 7.0 — Common contractual funds — — — — 25.9 — — 25.9 Insurance contracts — — — — 100.3 — — 100.3 $37.3 $12.1 $25.2 $— $324.5 $50.0 $148.3 $126.2 (1) This category includes a prime obligations money market portfolio. (2) This category includes United States Treasury/Federal agency securities and foreign government securities. (3) This category includes investments in approximately 60% equity securities, 30% fixed income securities and 10% cash. The following table summarizes the changes in fair value of the pension assets that are measured using Level 3 inputs. In 2016, we transferred in common contractual funds as part of the pension assets associated with the new German plan. During 2017, we transferred these funds to exchange-traded funds, for which the fair value is measured using either Level 1 or Level 2 inputs. We determined that transfers between fair-value-measurement levels occurred on the date of the event that caused the transfer. Year Ended December 31 2017 2016 Balance, beginning of year $126.2 $92.0 Transfers (25.4 ) 27.3 Actual return on plan assets (5.3 ) 13.9 Purchases, sales and settlements, net (0.6 ) (2.1 ) Currency exchange rate changes 13.9 (4.9 ) Balance, end of year $108.8 $126.2 Retiree Health Care Plan We provide medical and dental benefits to certain eligible retired employees in the United States. Due to the nature of the plan, there are no plan assets. The reconciliation of the changes in the plan’s benefit obligation and the statement of the funded status of the plan were as follows: Year Ended December 31 2017 2016 Change in Benefit Obligation Benefit obligation, beginning of year $15.6 $16.4 Interest cost 0.6 0.7 Actuarial (gain) loss (0.3 ) 0.2 Benefits paid (1.0 ) (1.7 ) Benefit obligation, end of year $14.9 $15.6 Funded Status at End of Year Funded status, end of year ($14.9 ) ($15.6 ) Amounts Recognized Current liabilities ($1.2 ) ($1.3 ) Noncurrent liabilities (13.7 ) (14.3 ) Net amount recognized ($14.9 ) ($15.6 ) The amount recognized in accumulated other comprehensive loss, net of tax, consists of a net loss of $1.4 and $1.7 for 2017 and 2016 , respectively, and a prior service credit of $4.8 and $5.4 in 2017 and 2016 , respectively. The discount rate used in the measurement of the benefit obligation was 3.5% and 4.0% in 2017 and 2016 , respectively. The discount rate used in the measurement of net periodic benefit cost was 4.0% , 4.3% and 3.9% in 2017 , 2016 , and 2015 , respectively. The components of net periodic benefit cost and other amounts recognized in other comprehensive loss for this plan were as follows: 2017 2016 2015 Net Periodic Benefit (Credit) Cost Interest cost $0.6 $0.7 $0.7 Net loss 0.1 0.1 0.1 Prior service credit (0.8 ) (0.8 ) (0.8 ) Net periodic benefit (credit) cost ($0.1 ) $— $— Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income/Loss Net (gain) loss ($0.3 ) $0.2 ($0.5 ) Amortization of net loss (0.1 ) (0.1 ) (0.1 ) Amortization of prior service credit 0.8 0.8 0.8 Total recognized in other comprehensive loss 0.4 0.9 0.2 Total recognized in net periodic benefit cost and other comprehensive income/loss $0.3 $0.9 $0.2 The estimated prior service credit for the retiree health care plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2018 is $0.8 . The health care cost trend rate is assumed to be 7.8% for 2018 , decreasing gradually to an ultimate rate of 5.8% in 2022 . Assumed health care cost trend rates could have a significant effect on the amounts reported. A one-percentage point change in the assumed health care cost trend rate would have the following effects: 1% Increase 1% Decrease Effect on total of service and interest cost components $— $— Effect on benefit obligation 0.2 (0.2 ) Future Contributions and Payments During 2018 , we plan to contribute approximately $4.0 to our pension plans and to fund our retiree health care payments as incurred. Projected benefit payments from the plans as of December 31, 2017 were estimated as follows: Year Pension Plans Retiree Health Care Plan 2018 $14.0 $1.2 2019 14.3 1.2 2020 15.8 1.1 2021 17.9 1.1 2022 19.6 1.1 2023–2027 127.8 5.0 Total projected benefit payments $209.4 $10.7 Defined Contribution Plans and Deferred Compensation Plans We have defined contribution plans covering substantially all permanent United States employees and various other employees throughout the world. With our company-sponsored plans, employees may elect to contribute a portion of their salary to the plans and we match a portion of their contributions up to a maximum percentage of the employee’s salary. In addition, profit sharing contributions are made if a targeted earnings level is reached. The total expense for our match and any profit sharing contributions was $17.6 , $21.4 and $19.6 for the years ended December 31, 2017 , 2016 and 2015 , respectively. In certain countries with statutory defined contribution plans, we pay a percentage of the employees' salary in pension premiums. The total expense for the statutory defined contribution plans was $35.6 , $24.0 and $24.7 for the years ended December 31, 2017 , 2016 and 2015 , respectively. We also have deferred compensation plans in the United States. One of the plans had an asset and liability of $98.0 and $85.7 as of December 31, 2017 and 2016 , respectively, with the remaining plans holding immaterial amounts of assets and liabilities.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss, net of tax, were as follows: December 31 2017 2016 Foreign currency translation $ (87.7 ) $ (289.1 ) Translation (loss) gain on net investment hedge, net of income taxes of $(23.1) and $11.2, respectively (39.9 ) 24.8 Translation loss on long-term intercompany loans (128.8 ) (133.7 ) Unrealized gain on investments, net of income taxes of $3.4 and $4.2, respectively 15.3 18.6 Defined benefit pension plans, net of income taxes of $(27.8) for both 2017 and 2016 (50.5 ) (50.4 ) Retiree health care plan, net of income taxes of $2.0 and $2.1, respectively 3.4 3.7 Accumulated other comprehensive loss $ (288.2 ) $ (426.1 )

Leases

Leases	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Leases	Leases We lease property and equipment primarily under operating leases. Renewal options exist for substantially all leases. Future minimum payments, by year and in the aggregate, under noncancelable operating leases with any remaining terms consisted of the following as of December 31, 2017 : Year 2018 $167.3 2019 123.0 2020 93.6 2021 69.0 2022 54.0 Thereafter 125.1 Total minimum lease payments $632.0 Rental expense for all operating leases was $173.1 , $166.5 and $174.9 for the years ended December 31, 2017 , 2016 and 2015 , respectively.

Interest and Other Expenses

Interest and Other Expenses	12 Months Ended
	Dec. 31, 2017
Other Nonoperating Income (Expense) [Abstract]
Interest and Other Expenses	Interest and Other Expenses Interest and other expenses consisted of the following: Year Ended December 31 2017 2016 2015 Interest expense $38.2 $37.9 $36.0 Interest income (4.8 ) (3.6 ) (2.5 ) Foreign exchange loss (gain) 0.8 2.8 (4.7 ) Miscellaneous expense (income), net 16.7 12.4 (0.6 ) Interest and other expenses $50.9 $49.5 $28.2

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We are exposed to various market risks relating to our ongoing business operations. The primary market risks, which are managed through the use of derivative instruments, are foreign currency exchange rate risk and interest rate risk. In certain circumstances, we enter into foreign currency forward exchange contracts (“forward contracts”) to reduce the effects of fluctuating foreign currency exchange rates on our cash flows denominated in foreign currencies. Our exposure to market risk for changes in interest rates relates primarily to our long-term debt obligations. We have historically managed interest rate risk through the use of a combination of fixed and variable rate borrowings. In accordance with the current accounting guidance for derivative instruments and hedging activities, we record all of our derivative instruments as either an asset or liability measured at their fair value. Foreign Currency Exchange Rate Risk Management A portion of the €400.0 Notes ( $477.8 ) and €350.0 ( $420.0 ) Notes was designated as a hedge of our net investment in our foreign subsidiaries with a Euro-functional currency as of December 31, 2017 . For this portion of the Euro-denominated notes, the gain or loss associated with foreign currency translation is recorded as a component of accumulated other comprehensive loss, net of taxes. As of December 31, 2017 and 2016 , we had an unrealized loss of $35.7 and an unrealized gain of $29.0 , respectively, included in accumulated other comprehensive loss, net of taxes, as the net investment hedge was deemed effective. On occasion, forward contracts are designated as a hedge of our net investment in our foreign subsidiaries. We had a translation loss of $4.2 as of both December 31, 2017 and 2016 , included in accumulated other comprehensive loss, net of taxes, as the net investment hedge was deemed effective. For our forward contracts that are not designated as hedges, any gain or loss resulting from the change in fair value is recognized in the current period earnings. These gains or losses are offset by the exposure related to receivables and payables with our foreign subsidiaries and to interest due on our Euro-denominated notes, which is paid annually in June and September. We recorded no gain, a loss of $1.6 and a gain of $0.6 for the years ended December 31, 2017 , 2016 and 2015 , respectively, associated with our forward contracts in interest and other expenses. The fair value measurements of these items recorded in our Consolidated Balance Sheets as of December 31, 2017 and 2016 are disclosed in Note 1 to the Consolidated Financial Statements.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Litigation In the normal course of business, the Company is named as a defendant in various legal proceedings in which claims are asserted against the Company. We record accruals for loss contingencies based on the circumstances of each claim, when it is probable that a loss has been incurred as of the balance sheet date and can be reasonably estimated. Although the outcome of litigation cannot be predicted with certainty, we believe the ultimate resolution of these legal proceedings will not have a material effect on our business or financial condition. In 2014, we recorded legal costs of $9.0 in the United States related to a settlement agreement in connection with a lawsuit in California involving allegations regarding our wage statements. The settlement agreement was approved by the court at a final hearing in June 2015. We believe that the settlement was in our best interest to avoid the costs and disruption of ongoing litigation. On April 26, 2017, the sellers of 7S, a company we acquired in 2015, initiated a process under the acquisition agreement to dispute the contingent consideration related to the acquisition and are claiming an additional $25.0 ( €20.8 ), plus interest. Under this process, the dispute has been submitted to an arbitration tribunal in Germany. We believe no further amounts are due and intend to vigorously dispute their claims in the arbitration. We are not currently able to predict the outcome of the arbitration or the timing of any resolution, and consequently, no amounts have been recorded in the Consolidated Financial Statements. Guarantees We have entered into certain guarantee contracts and stand-by letters of credit that total $201.9 ( $149.3 for guarantees and $52.6 for stand-by letters of credit) as of December 31, 2017 . The guarantees primarily relate to operating leases and indebtedness. The stand-by letters of credit relate to insurance requirements and debt facilities. If certain conditions were met under these arrangements, we would be required to satisfy our obligation in cash. Due to the nature of these arrangements and our historical experience, we do not expect to make any significant payments under these arrangements.

Segment Data

Segment Data	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Data	Segment Data We are organized and managed primarily on a geographic basis, with Right Management currently operating as a separate global business unit. Each country and business unit generally has its own distinct operations and management team, providing services under our global brands, and maintains its own financial reports. We have an executive sponsor for each global brand who is responsible for ensuring the integrity and consistency of delivery locally. We develop and implement global workforce solutions for our clients that deliver the outcomes that help them achieve their business strategy. Each operation reports directly or indirectly through a regional manager to a member of executive management. Given this reporting structure, all of our operations have been segregated into the following reporting segments: Americas, which includes United States and Other Americas; Southern Europe, which includes France, Italy and Other Southern Europe; Northern Europe; APME; and Right Management. The Americas, Southern Europe, Northern Europe and APME segments derive a significant majority of their revenues from the placement of contingent workers. The remaining revenues within these segments are derived from other workforce solutions and services, including ManpowerGroup Solutions (Recruitment Process Outsourcing (RPO), TAPFIN - Managed Service Provider (MSP), Proservia and Talent Based Outsourcing (TBO)), recruitment and assessment, and training and development. The Right Management segment revenues are derived from career management and talent management services. Segment revenues represent sales to external clients. We provide services to a wide variety of clients, none of which individually comprise a significant portion of revenues for us as a whole. Due to the nature of our business, we generally do not have export sales. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. We evaluate performance based on operating unit profit, which is equal to segment revenues less direct costs and branch and national headquarters operating costs. This profit measure does not include goodwill and intangible asset impairment charges or amortization of intangible assets related to acquisitions, corporate expenses, interest and other income and expense amounts or income taxes. Total assets for the segments are reported after the elimination of investments in subsidiaries and intercompany accounts. Year Ended December 31 2017 2016 2015 Revenues from Services (a) Americas: United States (b) $ 2,659.0 $ 2,836.8 $ 3,005.8 Other Americas 1,557.4 1,460.4 1,486.2 4,216.4 4,297.2 4,492.0 Southern Europe: France 5,477.2 4,837.4 4,661.3 Italy 1,475.9 1,167.7 1,226.1 Other Southern Europe 1,703.9 1,492.5 1,404.1 8,657.0 7,497.6 7,291.5 Northern Europe 5,306.4 5,129.1 5,033.7 APME 2,636.4 2,471.3 2,239.1 Right Management 218.1 258.9 273.6 $ 21,034.3 $ 19,654.1 $ 19,329.9 Operating Unit Profit Americas: United States $ 152.5 $ 142.9 $ 143.8 Other Americas 61.2 53.6 57.0 213.7 196.5 200.8 Southern Europe: France 278.0 250.6 258.8 Italy 104.5 79.1 70.9 Other Southern Europe 59.4 47.2 39.9 441.9 376.9 369.6 Northern Europe 140.7 173.0 144.7 APME 98.9 88.5 79.3 Right Management 36.0 44.7 38.3 931.2 879.6 832.7 Corporate expenses (108.4 ) (92.8 ) (111.0 ) Intangible asset amortization expense (c) (34.6 ) (36.0 ) (32.8 ) Interest and other expenses (50.9 ) (49.5 ) (28.2 ) Earnings before income taxes $ 737.3 $ 701.3 $ 660.7 (a) Further breakdown of revenues from services by geographical region was as follows: Revenues from Services 2017 2016 2015 United States $ 2,758.5 $ 2,950.2 $ 3,115.6 France 5,493.9 4,857.3 4,684.1 Italy 1,479.4 1,170.7 1,230.2 United Kingdom 1,619.2 1,819.7 2,118.4 Total Foreign 18,275.8 16,703.9 16,214.3 (b) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $14.8 , $15.1 and $15.2 for 2017 , 2016 and 2015 , respectively. (c) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately. Year Ended December 31 2017 2016 2015 Depreciation and Amortization Expense Americas: United States $ 9.3 $ 9.9 $ 9.3 Other Americas 2.5 2.7 2.9 11.8 12.6 12.2 Southern Europe: France 12.3 11.0 10.1 Italy 1.8 1.9 1.9 Other Southern Europe 4.7 3.5 3.2 18.8 16.4 15.2 Northern Europe 10.6 10.9 8.9 APME 4.7 5.3 4.7 Right Management 3.7 3.9 3.7 Corporate expenses 0.2 0.2 0.2 Intangible asset amortization expense (a) 34.6 36.0 32.8 $ 84.4 $ 85.3 $ 77.7 Earnings from Equity Investments Americas: United States $ — $ — $ — Other Americas — — — — — — Southern Europe: France — — 0.4 Italy — — — Other Southern Europe 15.0 3.6 7.5 15.0 3.6 7.9 Northern Europe — — 0.1 APME — — — Right Management — — — $ 15.0 $ 3.6 $ 8.0 (a) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately. As of December 31 2017 2016 2015 Total Assets Americas: United States $ 1,781.4 $ 1,718.9 $ 1,708.5 Other Americas 329.2 314.4 304.9 2,110.6 2,033.3 2,013.4 Southern Europe: France 2,753.1 2,104.8 1,926.3 Italy 436.7 294.9 267.1 Other Southern Europe 596.2 490.1 484.7 3,786.0 2,889.8 2,678.1 Northern Europe 1,569.0 1,292.4 1,197.7 APME 780.7 612.8 533.6 Right Management 138.1 136.6 143.9 Corporate (a) 499.2 609.3 950.8 $ 8,883.6 $ 7,574.2 $ 7,517.5 Equity Investments Americas: United States $ — $ — $ — Other Americas — — — — — — Southern Europe: France — 0.2 — Italy 0.4 0.4 0.2 Other Southern Europe 157.2 139.1 136.3 157.6 139.7 136.5 Northern Europe — 0.1 1.4 APME 0.1 — — Right Management — — — Corporate 1.0 6.0 — $ 158.7 $ 145.8 $ 137.9 (a) Corporate assets include assets that were not used in the operations of any segment, the most significant of which were purchased intangibles and cash. As of and Year Ended December 31 2017 2016 2015 Long-lived Assets (a) Americas: United States $ 20.6 $ 27.7 $ 26.0 Other Americas 6.1 6.3 7.3 26.7 34.0 33.3 Southern Europe: France 47.9 39.7 39.2 Italy 4.9 4.4 4.7 Other Southern Europe 24.3 18.3 14.2 77.1 62.4 58.1 Northern Europe 28.0 25.4 30.5 APME 21.4 17.9 19.4 Right Management 8.0 10.7 10.5 Corporate 0.1 0.2 0.4 $ 161.3 $ 150.6 $ 152.2 Additions to Long-Lived Assets Americas: United States $ 6.7 $ 11.9 $ 10.1 Other Americas 2.4 1.9 2.4 9.1 13.8 12.5 Southern Europe: France 15.2 13.3 10.3 Italy 1.7 1.7 2.4 Other Southern Europe 8.8 8.9 5.4 25.7 23.9 18.1 Northern Europe 11.8 8.5 12.1 APME 6.3 3.9 4.5 Right Management 1.0 4.5 4.7 Corporate — — 0.4 $ 53.9 $ 54.6 $ 52.3 (a) Further breakdown of long-lived assets by geographical region was as follows: Long-Lived Assets 2017 2016 2015 United States $ 24.9 $ 33.9 $ 32.3 France 49.1 40.9 40.4 Italy 4.9 4.4 4.7 United Kingdom 9.1 9.0 10.3 Total Foreign 136.4 116.7 119.9

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Data (Unaudited)	Quarterly Data (Unaudited) First Quarter Second Quarter Third Quarter Fourth Quarter Total Year Ended December 31, 2017 Revenues from services $ 4,757.2 $ 5,174.8 $ 5,464.8 $ 5,637.5 $ 21,034.3 Gross profit 787.8 861.7 900.6 934.5 3,484.6 Operating profit (a) 127.0 194.6 227.9 238.7 788.2 Net earnings (b) 74.4 117.0 137.7 216.3 545.4 Net earnings per share — basic $ 1.10 $ 1.74 $ 2.06 $ 3.26 $ 8.13 Net earnings per share — diluted (c) 1.09 1.72 2.04 3.22 8.04 Dividends per share — 0.93 — 0.93 1.86 Year Ended December 31, 2016 Revenues from services $ 4,587.7 $ 5,022.1 $ 5,088.2 $ 4,956.1 $ 19,654.1 Gross profit 773.8 860.7 858.3 841.0 3,333.8 Operating profit 131.7 196.0 211.1 212.0 750.8 Net earnings 71.7 115.4 129.2 127.4 443.7 Net earnings per share — basic $ 0.98 $ 1.61 $ 1.89 $ 1.89 $ 6.33 Net earnings per share — diluted 0.98 1.60 1.87 1.87 6.27 Dividends per share — 0.86 — 0.86 1.72 (a) Included restructuring costs of $24.0 and $10.5 recorded in the first and second quarter, respectively. (b) Included net tax benefits related to the Tax Act and French tax reform of $73.7 in the fourth quarter. (c) Included in the results are restructuring costs per diluted share of $(0.30) and $(0.10) for the first and second quarter, respectively, and net tax benefits per diluted share of $1.10 for the fourth quarter.

Schedule II VALUATION AND QUALI

Schedule II VALUATION AND QUALIFYING ACCOUNTS [Disclosure]	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Allowance for doubtful accounts	SCHEDULE II—Valuation and Qualifying Accounts For the years ended December 31, 2017 , 2016 and 2015 , in millions: Allowance for Doubtful Accounts: Balance at Beginning of Year Provisions Charged to Earnings Write-Offs Translation Adjustments Reclassifications and Other Balance at End of Year 2017 $ 98.2 $ 18.1 $ (17.6 ) $ 12.4 $ (0.3 ) $ 110.8 2016 98.1 20.4 (16.9 ) (3.2 ) (0.2 ) 98.2 2015 111.4 16.3 (20.3 ) (10.1 ) 0.8 98.1

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the reporting period. Actual results could differ from these estimates.
Basis of Consolidation	Basis of Consolidation The Consolidated Financial Statements include our operating results and the operating results of all of our majority-owned subsidiaries and entities in which we have a controlling financial interest. We have a controlling financial interest if we own a majority of the outstanding voting common stock and the noncontrolling shareholders do not have substantive participating rights, or we have significant control over an entity through contractual or economic interests in which we are the primary beneficiary. For subsidiaries in which we have an ownership interest of 50% or less, but more than 20%, the Consolidated Financial Statements reflect our ownership share of those earnings using the equity method of accounting. These investments, as well as certain other relationships, are also evaluated for consolidation under the accounting guidance on consolidation of variable interest entities. These investments were $158.7 and $145.8 as of December 31, 2017 and 2016 , respectively, and are included in other assets in the Consolidated Balance Sheets. Included in shareholders’ equity as of December 31, 2017 and 2016 are $103.9 and $88.9 , respectively, of unremitted earnings from investments accounted for using the equity method. All significant intercompany accounts and transactions have been eliminated in consolidation.
Revenues	Revenues We generate revenues from sales of services by our company-owned branch operations and from fees earned on sales of services by our franchise operations. Revenues are recognized as services are performed. The majority of our revenues are generated by our recruitment business, where billings are generally negotiated and invoiced on a per-hour basis. Accordingly, as contingent workers are placed, we record revenues based on the hours worked. Permanent recruitment revenues are recorded as placements are made. Provisions for sales allowances, based on historical experience, are recognized at the time the related sale is recognized. Our franchise agreements generally state that franchise fees are calculated based on a percentage of revenues. We record franchise fee revenues monthly based on the amounts due under the franchise agreements for that month. Franchise fees, which are included in revenues from services, were $23.7 , $23.3 and $24.2 for the years ended December 31, 2017 , 2016 and 2015 , respectively. In our outplacement business, we recognize revenues from individual programs and for large projects over the estimated period in which services are rendered to candidates. In our consulting business, revenues are recognized upon the performance of the service under the consulting service contract. For performance-based contracts, we defer recognizing revenues until the performance criteria have been met. The amounts billed for outplacement, consulting services and performance-based contracts in excess of the amount recognized as revenues are recorded as deferred revenue and included in accrued liabilities for the current portion and other long-term liabilities for the long-term portion in our Consolidated Balance Sheets. As of December 31, 2017 and 2016 , the current portion of deferred revenue was $46.5 and $38.7 , respectively, and the long-term portion of deferred revenue was $1.5 and $2.4 , respectively. W e record revenues from sales of services and the related direct costs in accordance with the accounting guidance on reporting revenue gross as a principal versus net as an agent. In situations where we act as a principal in the transaction, we report gross revenues and cost of services. When we act as an agent, we report the revenues on a net basis. Amounts billed to clients for out-of-pocket or other cost reimbursements are included in revenues from services, and the related costs are included in cost of services.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts We have an allowance for doubtful accounts recorded as an estimate of the accounts receivable balance that may not be collected. This allowance is calculated on an entity-by-entity basis with consideration for historical write-off experience, the current aging of receivables and a specific review for potential bad debts. Items that affect this balance mainly include bad debt expense and the write-off of accounts receivable balances. Bad debt expense is recorded as selling and administrative expenses in our Consolidated Statements of Operations and was $18.1 , $20.4 and $16.3 in 2017 , 2016 and 2015 , respectively. Factors that would cause this provision to increase primarily relate to increased bankruptcies by our clients and other difficulties collecting amounts billed. On the other hand, an improved write-off experience and aging of receivables would result in a decrease to the provision. Write-offs were $17.6 , $16.9 and $20.3 for 2017 , 2016 and 2015 , respectively.
Advertising Costs	Advertising Costs We expense production costs of advertising as they are incurred. Advertising expenses were $26.6 , $24.4 and $28.8 in 2017 , 2016 and 2015 , respectively.
Restructuring Costs	Restructuring Costs We recorded net restructuring costs of $34.5 in 2017 in selling and administrative expenses, primarily related to severances and office closures and consolidations in multiple countries and territories. During 2017 and 2016 , we made payments of $25.5 and $11.9 , respectively, out of our restructuring reserve. We expect a majority of the remaining $13.5 reserve will be paid by the end of 2018 . Changes in the restructuring liability balances for each reportable segment and Corporate were as follows: Americas (1) Southern Europe (2) Northern Europe APME Right Management Corporate Total Balance, January 1, 2016 $3.5 $1.7 $8.5 $1.7 $0.8 $0.2 $16.4 Costs paid or utilized (3.1 ) (0.4 ) (5.9 ) (1.6 ) (0.7 ) (0.2 ) (11.9 ) Balance, December 31, 2016 0.4 1.3 2.6 0.1 0.1 — 4.5 Severance costs 5.8 — 15.6 0.9 1.4 1.0 24.7 Office closure costs 0.5 — 8.2 0.5 0.6 — 9.8 Costs paid or utilized (5.0 ) (0.4 ) (16.8 ) (1.5 ) (0.9 ) (0.9 ) (25.5 ) Balance, December 31, 2017 $1.7 $0.9 $9.6 $— $1.2 $0.1 $13.5 (1) Balance related to United States was $2.9 as of January 1, 2016. In 2016 , United States paid/utilized $2.5 , leaving a $0.4 liability as of December 31, 2016 . In 2017 , United States incurred $3.7 for severance costs and $0.5 for office closure costs and paid/utilized $3.1 , leaving a $1.5 liability as of December 31, 2017 . (2) Balance related to France was $1.5 as of January 1, 2016. In 2016 , France paid/utilized $0.2 , leaving a $1.3 liability as of December 31, 2016 . In 2017 , France paid/utilized $0.4 , leaving a $0.9 liability as of December 31, 2017 . Italy had no restructuring reserves recorded as of either January 1, 2016, December 31, 2016 or December 31, 2017 .
Income Taxes	Income Taxes We account for income taxes in accordance with the accounting guidance on income taxes. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between financial statement carrying amounts of existing assets and liabilities and their respective tax basis, and net operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. We record a valuation allowance against deferred tax assets to reduce the assets to the amounts more likely than not to be realized. In December 2017, the United States enacted the Tax Cuts and Jobs Act of 2017 (“Tax Act”), and the Securities and Exchange Commission staff issued guidance on accounting for the tax effects of the Tax Act, which allows for a measurement period up to one year from the Tax Act enactment date for companies to complete the accounting. In accordance with the guidance, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete, but the company is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply current guidance on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. (See Note 5 to our Consolidated Financial Statements for further information on the impacts of the Tax Act.)
Fair Value Measurements	Fair Value Measurements The assets and liabilities measured and recorded at fair value on a recurring basis were as follows: Fair Value Measurements Using Fair Value Measurements Using December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2016 Quoted Prices in Significant Significant Assets Deferred compensation plan assets $99.1 $99.1 $— $— $86.8 $86.8 $— $— $99.1 $99.1 $— $— $86.8 $86.8 $— $— Liabilities Foreign currency forward contracts $0.1 $— $0.1 $— $0.2 $— $0.2 $— $0.1 $— $0.1 $— $0.2 $— $0.2 $— We determine the fair value of our deferred compensation plan assets, comprised of publicly traded securities, by using market quotes as of the last day of the period. The fair value of the foreign currency forward contracts is measured at the value from either directly or indirectly observable third parties. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, and other current assets and liabilities approximate their fair values because of the short-term nature of these instruments. The carrying value of our variable-rate long-term debt approximates fair value. The fair value of the Euro-denominated notes, as observable at commonly quoted intervals (Level 2 inputs), was $939.9 and $831.6 as of December 31, 2017 and 2016 , respectively, compared to a carrying value of $897.8 and $785.2 , respectively.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets We had goodwill, finite-lived intangible assets and indefinite-lived intangible assets as follows: December 31, 2017 December 31, 2016 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Goodwill (1) $ 1,343.0 $ — $ 1,343.0 $ 1,239.9 $ — $ 1,239.9 Intangible assets: Finite-lived: Customer relationships $ 453.6 $ 325.2 $ 128.4 $ 426.2 $ 287.2 $ 139.0 Other 19.3 14.7 4.6 17.2 12.6 4.6 472.9 339.9 133.0 443.4 299.8 143.6 Indefinite-lived: Tradenames (2) 52.0 — 52.0 52.0 — 52.0 Reacquired franchise rights 99.0 — 99.0 98.8 — 98.8 151.0 — 151.0 150.8 — 150.8 Total intangible assets $ 623.9 $ 339.9 $ 284.0 $ 594.2 $ 299.8 $ 294.4 (1) Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2017 and 2016 . (2) Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2017 and 2016 . Amortization expense related to intangibles was $34.6 , $36.0 and $32.8 in 2017 , 2016 and 2015 , respectively. Amortization expense expected in each of the next five years related to acquisitions completed as of December 31, 2017 is as follows: 2018 - $34.5 , 2019 - $29.7 , 2020 - $24.8 , 2021 - $13.8 and 2022 - $10.2 . The weighted-average useful lives of the customer relationships and other are approximately 13 and 4 years, respectively. The tradenames have been assigned an indefinite life based on our expectation of renewing the tradenames, as required, without material modifications and at a minimal cost, and our expectation of positive cash flows beyond the foreseeable future. The reacquired franchise rights result from our franchise acquisitions in the United States and Canada completed prior to 2009. In accordance with the accounting guidance on goodwill and other intangible assets, we perform an annual impairment test of goodwill at our reporting unit level and indefinite-lived intangible assets at our unit of account level during the third quarter, or more frequently if events or circumstances change that would more likely than not reduce the fair value of our reporting units below their carrying value. We performed our annual impairment test of our goodwill and indefinite-lived intangible assets during the third quarter of 2017 , 2016 and 2015 , and determined that there was no impairment of our goodwill or indefinite-lived intangible as a result of our annual tests. For our goodwill impairment testing procedures, we determined the fair value of each reporting unit generally by utilizing an income approach derived from a discounted cash flow methodology. For certain of our reporting units, a combination of the income approach (weighted 75% ) and the market approach (weighted 25% ) derived from comparable public companies was utilized. The income approach is developed from management’s forecasted cash flow data. Therefore, it represents an indication of fair market value reflecting management’s internal outlook for the reporting unit. The market approach utilizes the Guideline Public Company Method to quantify the respective reporting unit’s fair value based on revenues and earnings multiples realized by similar public companies. The market approach is more volatile as an indicator of fair value as compared to the income approach. We believe that each approach has its merits. However, in the instances where we have utilized both approaches, we have weighted the income approach more heavily than the market approach because we believe that management’s assumptions generally provide greater insight into the reporting unit’s fair value. Significant assumptions used in our goodwill impairment tests during 2017 , 2016 and 2015 included: expected revenue growth rates, operating unit profit margins, working capital levels, discount rates ranging from 10.1% to 13.3% for 2017 , and a terminal value multiple. The expected future revenue growth rates and the expected operating unit profit margins were determined after taking into consideration our historical revenue growth rates and operating unit profit margins, our assessment of future market potential, and our expectations of future business performance. We would record a goodwill impairment charge by the amount for which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of the goodwill. Under the current accounting guidance, we are also required to test our indefinite-lived intangible assets for impairment by comparing the fair value of the intangible asset with its carrying value. If the intangible asset’s fair value is less than its carrying value, an impairment loss is recognized for the difference.
Marketable Securities	Marketable Securities We account for our marketable security investments in accordance with the accounting guidance on investments in debt and equity securities, and have historically determined that all such investments are classified as available-for-sale. Accordingly, unrealized gains and unrealized losses that are determined to be temporary, net of related income taxes, are included in accumulated other comprehensive loss, which is a separate component of shareholders’ equity. Realized gains and losses, and unrealized losses determined to be other-than-temporary, are recorded in our Consolidated Statements of Operations. We hold a 49% interest in our Swiss franchise, accounted for under the equity method of accounting, which maintained an investment portfolio with a market value of $234.8 and $207.0 as of December 31, 2017 and 2016 , respectively. This portfolio is comprised of a wide variety of European and United States debt and equity securities as well as various professionally-managed funds, all of which are classified as available-for-sale. Our share of net realized gains and losses, and declines in value determined to be other-than-temporary, are included in our Consolidated Statements of Operations. For the years ended December 31, 2017 , 2016 and 2015 , realized gains totaled $14.7 , $2.9 and $2.3 , respectively, and realized losses totaled $3.8 , $1.0 and $1.1 , respectively. Other-than-temporary impairment amounts were net gains of $1.6 , $0.3 and $0.2 for 2017, 2016 and 2015, respectively, as previously impaired investments were sold for a gain. Our share of net unrealized gains and unrealized losses that are determined to be temporary related to these investments are included in accumulated other comprehensive loss, with the offsetting amount increasing or decreasing our investment in the franchise.
Capitalized Software for Internal Use	Capitalized Software for Internal Use We capitalize purchased software as well as internally developed software. Internal software development costs are capitalized from the time the internal use software is considered probable of completion until the software is ready for use. Business analysis, system evaluation, selection and software maintenance costs are expensed as incurred. Capitalized software costs are amortized using the straight-line method over the estimated useful life of the software which ranges from 3 to 10 years. The net capitalized software balance of $3.5 and $3.2 as of December 31, 2017 and 2016 , respectively, is included in other assets in the Consolidated Balance Sheets. Amortization expense related to the capitalized software costs was $1.3 , $1.9 and $1.7 for 2017 , 2016 and 2015 , respectively.
Property and Equipment	Property and Equipment A summary of property and equipment as of December 31 is as follows: 2017 2016 Land $ 3.4 $ 5.5 Buildings 14.5 16.2 Furniture, fixtures, and autos 172.3 157.6 Computer equipment 137.1 117.8 Leasehold improvements 306.1 269.9 Property and equipment $ 633.4 $ 567.0 Property and equipment are stated at cost and are depreciated using primarily the straight-line method over the following estimated useful lives: buildings - up to 40 years; furniture, fixtures, autos and computer equipment - 2 to 15 years; leasehold improvements - lesser of life of asset or expected lease term. Expenditures for renewals and betterments are capitalized whereas expenditures for repairs and maintenance are charged to income as incurred. Upon sale or disposition of property and equipment, the difference between the unamortized cost and the proceeds is recorded as either a gain or a loss and is included in our Consolidated Statements of Operations. Long-lived assets are evaluated for impairment in accordance with the provisions of the accounting guidance on the impairment or disposal of long-lived assets.
Derivative Financial Instruments	Derivative Financial Instruments We account for our derivative instruments in accordance with the accounting guidance on derivative instruments and hedging activities. Derivative instruments are recorded on the balance sheet as either an asset or liability measured at their fair value. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of the changes in the fair value of the derivative are recorded as a component of accumulated other comprehensive loss and recognized in the Consolidated Statements of Operations when the hedged item affects earnings. The ineffective portions of the changes in the fair value of cash flow hedges are recognized in earnings.
Foreign Currency Translation	Foreign Currency Translation The financial statements of our non-United States subsidiaries have been translated in accordance with the accounting guidance on foreign currency translation. Under the accounting guidance, asset and liability accounts are translated at the current exchange rates and income statement items are translated at the average exchange rates each month. The resulting translation adjustments are recorded as a component of accumulated other comprehensive loss, which is included in shareholders’ equity. A portion of our Euro-denominated notes is accounted for as a hedge of our net investment in our subsidiaries with a Euro-functional currency. For this portion of the Euro-denominated notes, since our net investment in these subsidiaries exceeds the amount of the related borrowings, net of tax, the related translation gains or losses are included as a component of accumulated other comprehensive loss.
Shareholders' Equity	Shareholders’ Equity In both July 2016 and October 2015, the Board of Directors authorized the repurchase of 6.0 million shares of our common stock. Share repurchases may be made from time to time through a variety of methods, including open market purchases, block transactions, privately negotiated transactions or similar facilities. In 2017, we repurchased a total of 1.9 million shares at a total cost of $203.9 under the 2016 authorization. In 2016, we repurchased a total of 6.6 million shares, comprised of 5.3 million shares under the 2015 authorization and 1.3 million shares under the 2016 authorization, at a total cost of $482.2 . In 2015, we repurchased a total of 6.7 million shares, comprised of 6.0 million shares under a previous authorization and 0.7 million shares under the 2015 authorization, at a total cost of $587.9 , including a nominal amount of shares at a cost of $7.7 that settled in January 2016. The share repurchases that settled in January were not reflected in the treasury stock in our Consolidated Balance Sheets as of December 31, 2015 . As of December 31, 2017 , there were 2.8 million shares remaining authorized for repurchase under the 2016 authorization and no shares remaining under the 2015 authorization. During 2017 , 2016 and 2015 , the Board of Directors declared total cash dividends of $1.86 , $1.72 and $1.60 per share, respectively, resulting in total dividend payments of $123.7 , $118.4 and $121.0 , respectively. Noncontrolling interests, included in total shareholders' equity in our Consolidated Balance Sheets, represent amounts related to majority-owned subsidiaries in which we have a controlling financial interest. Net earnings attributable to these noncontrolling interests were $6.5 , $10.1 and $6.6 for the year ended December 31, 2017 , 2016 and 2015 , respectively, which were recorded as expenses in interest and other expenses in our Consolidated Statements of Operations.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.
Payroll Tax Credit	Payroll Tax Credit In January 2013, the French government passed legislation, Credit d’Impôt pour la Compétitivité et l’Emploi (“CICE”), that provides payroll tax credits based on a percentage of wages paid to employees receiving less than two-and-a-half times the French minimum wage. The payroll tax credit was equal to 4% of eligible wages in 2013, 6% of eligible wages from 2014 to 2016, and 7% starting in 2017. The CICE payroll tax credit is accounted for as a reduction of our cost of services in the period earned. The payroll tax credit is creditable against our current French income tax payable, with any remaining amount being paid after three years. Given the amount of our current income taxes payable, we would generally receive the vast majority of these payroll tax credits after the three-year period. In March 2017, March 2016 and July 2015, we entered into an agreement to sell a portion of the credits earned in 2016, 2015 and 2014, respectively, for net proceeds of $143.5 ( €133.0 ), $143.1 ( €129.9 ) and $132.8 ( €120.1 ), respectively. We derecognized these receivables upon the sale as the terms of the agreement are such that the transaction qualifies for sale treatment according to the accounting guidance on the transfer and servicing of assets. The discount on the sale of these receivables was recorded in cost of services as a reduction of the payroll tax credits earned in the respective year.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers. The core principle of this amendment is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. As amended, the new guidance is effective for us in 2018 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative-effect adjustment as of the date of adoption ("modified retrospective approach"). We have completed our adoption plan and analysis of how we currently recognize revenue compared to the accounting treatment required under the new guidance. This plan included a review of client contracts and revenue transactions to determine the impact of the accounting treatment under the new guidance, evaluation of the adoption method, and completion of a rollout plan for the new guidance. We have concluded that the guidance will not have a material impact on our Consolidated Financial Statements or internal controls other than expanded disclosures. We will adopt the new guidance beginning January 1, 2018 and will use the modified retrospective approach. In January 2016, the FASB issued new accounting guidance on financial instruments. The new guidance requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. This new guidance impacts the accounting for our Swiss franchise's investment portfolio. Upon adoption in January 2018, we will recognize the cumulative unrealized gains or losses in our retained earnings, and subsequently, we will recognize all the fair value adjustments on the investment portfolio in the current period earnings as opposed to other comprehensive loss. As of December 31, 2017 and 2016, we had an unrecognized gain on investments, net of income taxes, of $15.3 and $18.6 , respectively, recorded in accumulated other comprehensive loss. In February 2016, the FASB issued new accounting guidance on leases. The new guidance requires that a lessee recognize assets and liabilities on the balance sheet for leases with lease terms longer than 12 months. The recognition, measurement and presentation of lease expenses and cash flows by a lessee will depend on its classification as a finance or operating lease. The guidance also includes new disclosure requirements providing information on the amounts recorded in the financial statements. The new guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements. In January 2017, the FASB issued new guidance that simplifies the accounting for goodwill impairment. The new guidance removes Step 2 of the current goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. We adopted this guidance effective April 1, 2017, and applied it to our annual impairment test in the third quarter of 2017. Adoption of this guidance had no impact on our Consolidated Financial Statements. In March 2017, the FASB issued new guidance on the presentation of net periodic pension and postretirement benefit cost ("net benefit cost"). Under current GAAP, net benefit cost is reported as an employee cost within operating income. The amendment requires bifurcation of net benefit cost. The service cost component will be presented with other employee compensation cost in operating income or capitalized in assets in rare circumstances. The other components will be reported separately outside of operations, and will not be eligible for capitalization. The guidance is effective for us in 2018 and will be applied retrospectively. Non-service cost components of net benefit cost, which are to be reclassified to interest and other expenses upon adoption of the new guidance, will be a cost of $1.0 and a credit of $5.3 for 2017 and 2016, respectively. In May 2017, the FASB issued new guidance on share-based payment awards. The new guidance clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, vesting conditions or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The guidance is effective for us in 2018. We do not expect the adoption of this guidance to have a material impact on our Consolidated Financial Statements. In August 2017, the FASB issued new guidance on hedge accounting. The amendments in this guidance include the elimination of the concept of recognizing periodic hedge ineffectiveness for cash flow and net investment hedges, recognition and presentation of changes in the fair value of the hedging instrument, recognition and presentation of components excluded from an entity's hedge effectiveness assessment, addition of the ability to elect to perform subsequent effectiveness assessments qualitatively, and addition of new disclosure requirements. The guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements. In February 2018, the FASB issued new guidance on reporting comprehensive income. The new guidance allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. The guidance is effective for us in 2019. We are currently assessing the impact of the adoption of this guidance on our Consolidated Financial Statements.
Subsequent Events	Subsequent Events We have evaluated events and transactions occurring after the balance sheet date through our filing date and noted no events that are subject to recognition or disclosure.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Schedule of changes in restructuring liability balance by segment	Changes in the restructuring liability balances for each reportable segment and Corporate were as follows: Americas (1) Southern Europe (2) Northern Europe APME Right Management Corporate Total Balance, January 1, 2016 $3.5 $1.7 $8.5 $1.7 $0.8 $0.2 $16.4 Costs paid or utilized (3.1 ) (0.4 ) (5.9 ) (1.6 ) (0.7 ) (0.2 ) (11.9 ) Balance, December 31, 2016 0.4 1.3 2.6 0.1 0.1 — 4.5 Severance costs 5.8 — 15.6 0.9 1.4 1.0 24.7 Office closure costs 0.5 — 8.2 0.5 0.6 — 9.8 Costs paid or utilized (5.0 ) (0.4 ) (16.8 ) (1.5 ) (0.9 ) (0.9 ) (25.5 ) Balance, December 31, 2017 $1.7 $0.9 $9.6 $— $1.2 $0.1 $13.5 (1) Balance related to United States was $2.9 as of January 1, 2016. In 2016 , United States paid/utilized $2.5 , leaving a $0.4 liability as of December 31, 2016 . In 2017 , United States incurred $3.7 for severance costs and $0.5 for office closure costs and paid/utilized $3.1 , leaving a $1.5 liability as of December 31, 2017 . (2) Balance related to France was $1.5 as of January 1, 2016. In 2016 , France paid/utilized $0.2 , leaving a $1.3 liability as of December 31, 2016 . In 2017 , France paid/utilized $0.4 , leaving a $0.9 liability as of December 31, 2017 . Italy had no restructuring reserves recorded as of either January 1, 2016, December 31, 2016 or December 31, 2017 .
Schedule of fair value of assets and liabilities measured on a recurring basis	The assets and liabilities measured and recorded at fair value on a recurring basis were as follows: Fair Value Measurements Using Fair Value Measurements Using December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2016 Quoted Prices in Significant Significant Assets Deferred compensation plan assets $99.1 $99.1 $— $— $86.8 $86.8 $— $— $99.1 $99.1 $— $— $86.8 $86.8 $— $— Liabilities Foreign currency forward contracts $0.1 $— $0.1 $— $0.2 $— $0.2 $— $0.1 $— $0.1 $— $0.2 $— $0.2 $—
Schedule of goodwill, finite-lived intangible assets and indefinite-lived intangible assets	We had goodwill, finite-lived intangible assets and indefinite-lived intangible assets as follows: December 31, 2017 December 31, 2016 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Goodwill (1) $ 1,343.0 $ — $ 1,343.0 $ 1,239.9 $ — $ 1,239.9 Intangible assets: Finite-lived: Customer relationships $ 453.6 $ 325.2 $ 128.4 $ 426.2 $ 287.2 $ 139.0 Other 19.3 14.7 4.6 17.2 12.6 4.6 472.9 339.9 133.0 443.4 299.8 143.6 Indefinite-lived: Tradenames (2) 52.0 — 52.0 52.0 — 52.0 Reacquired franchise rights 99.0 — 99.0 98.8 — 98.8 151.0 — 151.0 150.8 — 150.8 Total intangible assets $ 623.9 $ 339.9 $ 284.0 $ 594.2 $ 299.8 $ 294.4 (1) Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2017 and 2016 . (2) Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2017 and 2016 .
Summary of property and equipment	A summary of property and equipment as of December 31 is as follows: 2017 2016 Land $ 3.4 $ 5.5 Buildings 14.5 16.2 Furniture, fixtures, and autos 172.3 157.6 Computer equipment 137.1 117.8 Leasehold improvements 306.1 269.9 Property and equipment $ 633.4 $ 567.0

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of stock option activity	A summary of stock option activity is as follows: Shares (000) Wtd. Avg. Exercise Price Per Share Wtd. Avg. Remaining Contractual Term (years) Aggregate Intrinsic Value (in millions) Outstanding, January 1, 2015 2,484 $59 Granted 147 77 Exercised (1,255 ) 56 $39 Expired or cancelled (104 ) 56 Outstanding, December 31, 2015 1,272 $64 5.2 $26 Vested or expected to vest, December 31, 2015 1,267 $64 5.2 Exercisable, December 31, 2015 911 $62 4.0 $20 Outstanding, January 1, 2016 1,272 $64 Granted 166 75 Exercised (279 ) 63 $5 Expired or cancelled (32 ) 67 Outstanding, December 31, 2016 1,127 $66 4.9 $26 Vested or expected to vest, December 31, 2016 1,122 $66 4.9 Exercisable, December 31, 2016 756 $62 3.3 $20 Outstanding, January 1, 2017 1,127 $66 Granted 145 97 Exercised (680 ) 64 $24 Expired or cancelled (18 ) 75 Outstanding, December 31, 2017 574 $77 7.1 $28 Vested or expected to vest, December 31, 2017 571 $77 7.1 Exercisable, December 31, 2017 220 $65 5.3 $14
Schedule of options outstanding and exercisable	Options outstanding and exercisable as of December 31, 2017 were as follows: Options Outstanding Options Exercisable Exercise Price Shares (000) Weighted- Average Remaining Contractual Life (years) Weighted- Average Exercise Price Shares (000) Weighted-Average Exercise Price $27-$49 35 2.8 $39 35 $39 $50-$59 59 3.8 53 59 53 $60-$75 163 7.8 75 39 73 $76-$97 317 7.8 87 87 78 574 7.1 $77 220 $65
Assumptions used to estimate fair value of share awards	We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions: Year Ended December 31 2017 2016 2015 Average risk-free interest rate 2.0 % 1.4 % 1.6 % Expected dividend yield 2.0 % 2.1 % 1.5 % Expected volatility 31.0 % 33.0 % 32.0 % Expected term (years) 6.0 6.0 6.0
Summary of restricted stock activity	A summary of restricted stock activity is as follows: Shares (000) Wtd. Avg. Price Per Share Wtd. Avg. Remaining Contractual Term (years) Aggregate Intrinsic Value (in millions) Unvested, January 1, 2015 463 $57 1.2 Granted 179 76 Vested (217 ) 59 Forfeited (20 ) 60 Unvested, December 31, 2015 405 $64 1.3 Granted 232 $75 Vested (172 ) 62 Forfeited (14 ) 76 Unvested, December 31, 2016 451 $70 1.4 Granted 167 $98 Vested (133 ) 79 Forfeited (37 ) 80 Unvested, December 31, 2017 448 $77 1.2 $56
Summary of performance share units detail by grant year	A summary of the performance share units detail by grant year is as follows: 2014 2015 2016 2017 Grant Date(s) February 11, February 11, 2015 February 16, 2016 February 9, 2017 Performance Period (years) 2014-2016 2015-2017 2016-2018 2017-2019 Vesting Date February 2017 February 2018 (a) February 2019 (a) February 2020 (a) Payout Levels (in units): Threshold Award 94,608 82,298 65,141 57,563 Target Award 189,215 164,595 130,282 115,125 Outstanding Award 378,430 329,190 260,564 230,250 Shares Issued in 2017 335,179 — — — Payout Achieved Over Performance Period — 219,519 — — (a) 2015, 2016 and 2017 awards are scheduled to vest in February 2018, 2019, and 2020, respectively, when the Executive Compensation and Human Resources Committee of the Board of Directors determines the achievement of the performance criteria.

Net Earnings Per Share (Tables)

Net Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Calculation of net earnings per share - basic and net earnings per share - diluted	The calculation of net earnings per share - basic and net earnings per share - diluted were as follows: Year Ended December 31 2017 2016 2015 Net earnings available to common shareholders: $545.4 $443.7 $419.2 Weighted-average common shares outstanding (in millions): Weighted-average common shares outstanding - basic 67.1 70.1 76.8 Effect of dilutive securities - stock options 0.2 0.2 0.5 Effect of other share-based awards 0.6 0.5 0.4 Weighted-average common shares outstanding - diluted 67.9 70.8 77.7 Net earnings per share - basic $8.13 $6.33 $5.46 Net earnings per share - diluted $8.04 $6.27 $5.40
Schedule of antidilutive awards	The number, exercise prices and weighted-average remaining life of these antidilutive awards were as follows: 2017 2016 2015 Shares (in thousands) — 20 20 Exercise price $— $93 $93 Weighted-average remaining life 0.0 years 0.4 years 1.4 years

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of provision for income taxes	The provision for income taxes was as follows: Year Ended December 31 2017 2016 2015 Current United States Federal $211.7 $35.6 ($8.4 ) State 8.4 4.0 — Non-United States 168.6 144.0 158.7 Total current 388.7 183.6 150.3 Deferred United States Federal (178.2 ) 69.7 92.9 State (0.8 ) 0.5 1.8 Non-United States (17.8 ) 3.8 (3.5 ) Total deferred (196.8 ) 74.0 91.2 Total provision $191.9 $257.6 $241.5
Schedule of effective income tax rate reconciliation	A reconciliation between taxes computed at the United States federal statutory rate of 35% and the consolidated effective tax rate is as follows: Year Ended December 31 2017 2016 2015 Income tax based on statutory rate $258.1 $245.5 $231.2 Increase (decrease) resulting from: Non-United States tax rate difference: French business tax (1) 46.9 41.0 40.0 French CICE (2) (77.1 ) — — Other (2) (28.6 ) (23.5 ) (19.6 ) Repatriation of non-United States earnings (2)(3) 69.7 (10.5 ) (16.9 ) State income taxes, net of federal benefit 1.1 2.2 2.7 Change in valuation allowance (6.9 ) (6.0 ) 3.3 United States Tax Act and French tax reform (3) (73.7 ) — — Other, net 2.4 8.9 0.8 Tax provision $191.9 $257.6 $241.5 (1) The French business tax is allowed as a deduction for French income tax purposes. The gross amount of the French business tax was $72.1 , $63.1 and $61.5 for 2017, 2016 and 2015, respectively. The amounts in the table above of $46.9 , $41.0 and $40.0 , respectively, represent the French business tax expense net of the French tax benefit. (2) The French CICE is a payroll tax credit that is tax-free for French tax purposes and increases French earnings. The French tax benefits related to the CICE were $58.9 and $56.2 for 2016 and 2015, respectively. Prior to the Tax Act, this increase in French earnings resulted in a United States tax expense as these French earnings were deemed to be not permanently invested, which is included in Repatriations of non-United States earnings. Included in Other Non-United States tax rate differences are benefits of $2.4 , $1.8 and $1.5 for 2017, 2016 and 2015, respectively, that relate to French earnings that are deemed to be permanently invested. (3) Prior to the enactment of the Tax Act on December 22, 2017, we recorded $83.3 of tax expense in 2017 related to non-United States earnings that were deemed to be not permanently invested. This amount is included in the Repatriation of non-United States earnings consistent with prior years. As a result of the Tax Act, this $83.3 was reversed as we are no longer recording United States federal income tax expense on these earnings, and this tax benefit is included in the United States Tax Act and French tax reform benefit of $73.7 .
Components of future income tax benefits (expense)	December 31 2017 2016 Future Income Tax Benefits (Expense) Accrued payroll taxes and insurance $17.3 $30.6 Employee compensation payable 20.2 26.6 Pension and postretirement benefits 49.0 60.7 Intangible assets (103.0 ) (146.8 ) Repatriation of non-United States earnings (5.5 ) (164.8 ) Intercompany loans denominated in foreign currencies (13.5 ) (74.2 ) Net operating losses 104.1 92.7 Other 77.6 120.7 Valuation allowance (77.5 ) (86.3 ) Total future tax benefits (expense) $68.7 ($140.8 ) Deferred tax asset $101.0 $81.4 Deferred tax liability (32.3 ) (222.2 ) Total future tax benefits (expense) $68.7 ($140.8 )
Summary of net operating loss carryforwards	The net operating loss carryforwards expire as follows: United States Federal and Non-United States United States State 2018 $1.5 $3.0 2019 6.5 4.0 2020 3.3 0.2 2021 5.3 3.8 2022 3.4 — Thereafter 25.0 187.7 No expirations 356.2 — Total net operating loss carryforwards $401.2 $198.7
Summary of unrecognized tax benefit activity	The following table summarizes the activity related to our unrecognized tax benefits during 2017 , 2016 and 2015 : 2017 2016 2015 Gross unrecognized tax benefits, beginning of year $23.8 $19.0 $23.0 Increases in prior year tax positions 27.1 4.1 2.3 Decreases in prior year tax positions (1.2 ) (1.7 ) (0.5 ) Increases for current year tax positions 6.6 4.1 3.1 Expiration of statute of limitations and audit settlements (10.2 ) (1.7 ) (8.9 ) Gross unrecognized tax benefits, end of year $46.1 $23.8 $19.0 Potential interest and penalties 20.4 20.2 19.9 Balance, end of year $66.5 $44.0 $38.9

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in goodwill by reportable segment and corporate	Changes in the carrying value of goodwill by reportable segment and Corporate were as follows: Americas (1) Southern Europe (2) Northern Europe APME Right Management Corporate (3) Total (4) Balance, January 1, 2016 $ 515.7 $ 97.2 $ 441.9 $ 75.6 $ 62.1 $ 64.9 $ 1,257.4 Goodwill acquired — — 22.3 1.5 — 0.6 24.4 Currency impact and other 0.7 (0.2 ) (42.3 ) (0.1 ) — — (41.9 ) Balance, December 31, 2016 516.4 97.0 421.9 77.0 62.1 65.5 1,239.9 Goodwill acquired — 10.0 0.1 24.9 — — 35.0 Currency impact and other 2.8 14.9 46.1 4.3 — — 68.1 Balance, December 31, 2017 $ 519.2 $ 121.9 $ 468.1 $ 106.2 $ 62.1 $ 65.5 $ 1,343.0 (1) Balances related to United States were $476.9 , $476.5 and $476.5 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. (2) Balances related to France were $69.0 , $66.8 and $76.3 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. Balances related to Italy were $4.5 , $4.4 and $5.0 as of January 1, 2016 , December 31, 2016 and December 31, 2017 , respectively. (3) The majority of the Corporate balance as of December 31, 2017 relates to goodwill attributable to our acquisition of Jefferson Wells ( $55.5 ) which is part of the United States reporting unit. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See the table below for the breakout of goodwill balances by reporting unit. (4) Balances were net of accumulated impairment loss of $513.4 as of January 1, 2016 , December 31, 2016 and December 31, 2017 .
Schedule of goodwill balances by reporting unit	Goodwill balances by reporting unit were as follows: December 31 2017 2016 United States $532.0 $532.0 Germany 135.4 121.4 Netherlands 126.5 110.9 United Kingdom 89.2 81.4 France 76.3 66.8 Right Management 62.1 62.1 Other reporting units 321.5 265.3 Total goodwill $1,343.0 $1,239.9

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of short-term borrowings	Information concerning short-term borrowings is as follows: December 31 2017 2016 Short-term borrowings $49.1 $39.5 Weighted-average interest rates 7.9 % 11.1 %
Summary of long-term debt	A summary of long-term debt is as follows: December 31 2017 2016 Euro-denominated notes: €400 due September 2022 $477.8 $417.7 €350 due June 2018 420.0 367.5 Other 0.6 0.7 898.4 785.9 Less - current maturities 420.3 0.3 Long-term debt $478.1 $785.6

Retirement and Deferred Compe33

Retirement and Deferred Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Schedule of projected future benefit payments	Projected benefit payments from the plans as of December 31, 2017 were estimated as follows: Year Pension Plans Retiree Health Care Plan 2018 $14.0 $1.2 2019 14.3 1.2 2020 15.8 1.1 2021 17.9 1.1 2022 19.6 1.1 2023–2027 127.8 5.0 Total projected benefit payments $209.4 $10.7
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Reconciliation of changes in benefit obligations and the statement of funded status of plan	The reconciliation of the changes in the plans’ benefit obligations and the fair value of plan assets and the funded status of the plans are as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Change in Benefit Obligation Benefit obligation, beginning of year $53.1 $53.1 $416.0 $326.1 Service cost — — 10.1 8.0 Interest cost 1.7 1.8 8.9 10.0 Curtailment and settlement — — — (29.0 ) Transfers — — 9.3 105.4 Actuarial loss 3.0 2.2 1.0 39.8 Plan participant contributions — — 0.2 0.2 Benefits paid (4.1 ) (4.0 ) (9.5 ) (7.7 ) Currency exchange rate changes — — 53.5 (36.8 ) Benefit obligation, end of year $53.7 $53.1 $489.5 $416.0 United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Change in Plan Assets Fair value of plan assets, beginning of year $37.3 $37.2 $324.5 $314.7 Actual return on plan assets 3.0 1.7 13.4 44.6 Settlement — — — (26.1 ) Transfers — — 1.8 34.9 Plan participant contributions — — 0.2 0.2 Company contributions 2.5 2.4 7.9 0.5 Benefits paid (4.1 ) (4.0 ) (9.5 ) (7.7 ) Currency exchange rate changes — — 38.4 (36.6 ) Fair value of plan assets, end of year $38.7 $37.3 $376.7 $324.5 Funded Status at End of Year Funded status, end of year ($15.0 ) ($15.8 ) ($112.8 ) ($91.5 ) Amounts Recognized Noncurrent assets $15.3 $14.3 $36.8 $30.4 Current liabilities (2.5 ) (2.5 ) (0.4 ) (0.8 ) Noncurrent liabilities (27.8 ) (27.6 ) (149.2 ) (121.1 ) Net amount recognized ($15.0 ) ($15.8 ) ($112.8 ) ($91.5 )
Schedule of amounts recognized in accumulated other comprehensive loss, net of tax	Amounts recognized in accumulated other comprehensive loss, net of tax, consisted of: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Net loss $13.9 $13.0 $29.9 $32.7 Prior service cost — — 6.7 4.7 Total $13.9 $13.0 $36.6 $37.4
Schedule of plans with accumulated benefit obligations in excess of fair value of plan assets	The accumulated benefit obligation for certain of our plans exceeded the fair value of plan assets as follows: December 31 2017 2016 Accumulated benefit obligation $135.9 $107.9 Plan assets 65.5 47.9
Schedule of plans with projected benefit obligation in excess of fair value of plan assets	The projected benefit obligation for certain of our plans exceeded the fair value of plan assets as follows: December 31 2017 2016 Projected benefit obligation $143.8 $113.9 Plan assets 65.5 47.9
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive loss	The components of the net periodic benefit cost and other amounts recognized in other comprehensive loss for all plans were as follows: Year Ended December 31 2017 2016 2015 Net Periodic Benefit Cost Service cost $10.1 $8.0 $7.2 Interest cost 10.6 11.8 12.7 Expected return on assets (10.8 ) (10.9 ) (12.9 ) Curtailment and settlement — (6.9 ) — Net loss 0.9 1.0 4.0 Prior service cost 0.4 0.4 0.4 Net periodic benefit cost 11.2 3.4 11.4 Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss Net (gain) loss (1.5 ) 24.7 (22.9 ) Prior service cost 2.9 — — Amortization of net loss (0.9 ) (1.0 ) (4.0 ) Amortization of prior service cost (0.4 ) (0.4 ) (0.4 ) Total recognized in other comprehensive loss 0.1 23.3 (27.3 ) Total recognized in net periodic benefit cost and other comprehensive income/loss $11.3 $26.7 ($15.9 )
Schedule of weighted-average assumptions used in measurement of benefit obligation and net periodic benefit cost	The weighted-average assumptions used in the measurement of the benefit obligation were as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2017 2016 Discount rate 3.6 % 4.0 % 2.1 % 2.2 % Rate of compensation increase 3.0 % 3.0 % 1.9 % 1.7 % The weighted-average assumptions used in the measurement of the net periodic benefit cost were as follows: United States Plans Non-United States Plans Year Ended December 31 2017 2016 2015 2017 2016 2015 Discount rate - service cost 4.1 % 4.4 % 3.9 % 2.2 % 3.2 % 2.9 % Discount rate - interest cost 3.3 % 3.4 % 3.9 % 2.2 % 3.2 % 2.9 % Expected long-term return on plan assets 4.8 % 5.3 % 5.5 % 2.8 % 3.4 % 3.2 % Rate of compensation increase 3.0 % 3.0 % 3.0 % 1.7 % 2.2 % 2.6 %
Schedule of fair value of plan assets by asset category	The fair value of our pension plan assets by asset category was as follows: United States Plans Non-United States Plans Fair Value Measurements Using Fair Value Measurements Using December 31, 2017 Quoted Significant Significant December 31, 2017 Quoted Significant Significant Asset Category Cash and cash equivalents (1) $0.2 $— $0.2 $— $5.1 $5.1 $— $— Equity securities: United States companies 12.3 12.3 — — 15.2 15.2 — — International companies — — — — 35.7 35.7 — — Fixed income securities: Government bonds (2) 15.2 — 15.2 — 45.2 — 45.2 — Corporate bonds 11.0 — 11.0 — 59.8 — 59.8 — Guaranteed insurance contracts — — — — 17.6 — 17.6 — Annuity contract — — — — 55.3 — 55.3 — Other types of investments: Unitized funds (3) — — — — 25.8 25.8 — — Real estate funds — — — — 8.2 — 8.2 — Insurance contracts — — — — 108.8 — — 108.8 $38.7 $12.3 $26.4 $— $376.7 $81.8 $186.1 $108.8 (1)This category includes a prime obligations money market portfolio. (2)This category includes United States Treasury/Federal agency securities and foreign government securities. (3)This category includes investments in approximately 60% equity securities, 30% fixed income securities and 10% cash. United States Plans Non-United States Plans Fair Value Measurements Using Fair Value Measurements Using December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2016 Quoted Significant Significant Asset Category Cash and cash equivalents (1) $0.2 $— $0.2 $— $9.7 $9.2 $0.5 $— Equity securities: United States companies 12.1 12.1 — — — — — — International companies — — — — 17.7 17.7 — — Fixed income securities: Government bonds (2) 14.7 — 14.7 — 27.5 — 27.5 — Corporate bonds 10.3 — 10.3 — 49.6 — 49.6 — Guaranteed insurance contracts — — — — 14.2 — 14.2 — Annuity contract — — — — 49.5 — 49.5 — Other types of investments: Unitized funds (3) — — — — 23.1 23.1 — — Real estate funds — — — — 7.0 — 7.0 — Common contractual funds — — — — 25.9 — — 25.9 Insurance contracts — — — — 100.3 — — 100.3 $37.3 $12.1 $25.2 $— $324.5 $50.0 $148.3 $126.2 (1) This category includes a prime obligations money market portfolio. (2) This category includes United States Treasury/Federal agency securities and foreign government securities. (3) This category includes investments in approximately 60% equity securities, 30% fixed income securities and 10% cash.
Schedule of changes in fair values of common contractual funds and insurance contracts	Year Ended December 31 2017 2016 Balance, beginning of year $126.2 $92.0 Transfers (25.4 ) 27.3 Actual return on plan assets (5.3 ) 13.9 Purchases, sales and settlements, net (0.6 ) (2.1 ) Currency exchange rate changes 13.9 (4.9 ) Balance, end of year $108.8 $126.2
Retiree Health Care Plan
Defined Benefit Plan Disclosure [Line Items]
Reconciliation of changes in benefit obligations and the statement of funded status of plan	The reconciliation of the changes in the plan’s benefit obligation and the statement of the funded status of the plan were as follows: Year Ended December 31 2017 2016 Change in Benefit Obligation Benefit obligation, beginning of year $15.6 $16.4 Interest cost 0.6 0.7 Actuarial (gain) loss (0.3 ) 0.2 Benefits paid (1.0 ) (1.7 ) Benefit obligation, end of year $14.9 $15.6 Funded Status at End of Year Funded status, end of year ($14.9 ) ($15.6 ) Amounts Recognized Current liabilities ($1.2 ) ($1.3 ) Noncurrent liabilities (13.7 ) (14.3 ) Net amount recognized ($14.9 ) ($15.6 )
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive loss	The components of net periodic benefit cost and other amounts recognized in other comprehensive loss for this plan were as follows: 2017 2016 2015 Net Periodic Benefit (Credit) Cost Interest cost $0.6 $0.7 $0.7 Net loss 0.1 0.1 0.1 Prior service credit (0.8 ) (0.8 ) (0.8 ) Net periodic benefit (credit) cost ($0.1 ) $— $— Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income/Loss Net (gain) loss ($0.3 ) $0.2 ($0.5 ) Amortization of net loss (0.1 ) (0.1 ) (0.1 ) Amortization of prior service credit 0.8 0.8 0.8 Total recognized in other comprehensive loss 0.4 0.9 0.2 Total recognized in net periodic benefit cost and other comprehensive income/loss $0.3 $0.9 $0.2
Schedule of effect of one-percentage-point change in assumed health care cost trend rates	A one-percentage point change in the assumed health care cost trend rate would have the following effects: 1% Increase 1% Decrease Effect on total of service and interest cost components $— $— Effect on benefit obligation 0.2 (0.2 )

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of components of accumulated other comprehensive loss, net of tax	The components of accumulated other comprehensive loss, net of tax, were as follows: December 31 2017 2016 Foreign currency translation $ (87.7 ) $ (289.1 ) Translation (loss) gain on net investment hedge, net of income taxes of $(23.1) and $11.2, respectively (39.9 ) 24.8 Translation loss on long-term intercompany loans (128.8 ) (133.7 ) Unrealized gain on investments, net of income taxes of $3.4 and $4.2, respectively 15.3 18.6 Defined benefit pension plans, net of income taxes of $(27.8) for both 2017 and 2016 (50.5 ) (50.4 ) Retiree health care plan, net of income taxes of $2.0 and $2.1, respectively 3.4 3.7 Accumulated other comprehensive loss $ (288.2 ) $ (426.1 )

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Schedule of future minimum payments under noncancelable operating leases	Future minimum payments, by year and in the aggregate, under noncancelable operating leases with any remaining terms consisted of the following as of December 31, 2017 : Year 2018 $167.3 2019 123.0 2020 93.6 2021 69.0 2022 54.0 Thereafter 125.1 Total minimum lease payments $632.0

Interest and Other Expenses (Ta

Interest and Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Other Nonoperating Income (Expense) [Abstract]
Schedule of interest and other expenses	Interest and other expenses consisted of the following: Year Ended December 31 2017 2016 2015 Interest expense $38.2 $37.9 $36.0 Interest income (4.8 ) (3.6 ) (2.5 ) Foreign exchange loss (gain) 0.8 2.8 (4.7 ) Miscellaneous expense (income), net 16.7 12.4 (0.6 ) Interest and other expenses $50.9 $49.5 $28.2

Segment Data (Tables)

Segment Data (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of segment information - revenues from services, operating unit profit	Year Ended December 31 2017 2016 2015 Revenues from Services (a) Americas: United States (b) $ 2,659.0 $ 2,836.8 $ 3,005.8 Other Americas 1,557.4 1,460.4 1,486.2 4,216.4 4,297.2 4,492.0 Southern Europe: France 5,477.2 4,837.4 4,661.3 Italy 1,475.9 1,167.7 1,226.1 Other Southern Europe 1,703.9 1,492.5 1,404.1 8,657.0 7,497.6 7,291.5 Northern Europe 5,306.4 5,129.1 5,033.7 APME 2,636.4 2,471.3 2,239.1 Right Management 218.1 258.9 273.6 $ 21,034.3 $ 19,654.1 $ 19,329.9 Operating Unit Profit Americas: United States $ 152.5 $ 142.9 $ 143.8 Other Americas 61.2 53.6 57.0 213.7 196.5 200.8 Southern Europe: France 278.0 250.6 258.8 Italy 104.5 79.1 70.9 Other Southern Europe 59.4 47.2 39.9 441.9 376.9 369.6 Northern Europe 140.7 173.0 144.7 APME 98.9 88.5 79.3 Right Management 36.0 44.7 38.3 931.2 879.6 832.7 Corporate expenses (108.4 ) (92.8 ) (111.0 ) Intangible asset amortization expense (c) (34.6 ) (36.0 ) (32.8 ) Interest and other expenses (50.9 ) (49.5 ) (28.2 ) Earnings before income taxes $ 737.3 $ 701.3 $ 660.7 (a) Further breakdown of revenues from services by geographical region was as follows: Revenues from Services 2017 2016 2015 United States $ 2,758.5 $ 2,950.2 $ 3,115.6 France 5,493.9 4,857.3 4,684.1 Italy 1,479.4 1,170.7 1,230.2 United Kingdom 1,619.2 1,819.7 2,118.4 Total Foreign 18,275.8 16,703.9 16,214.3 (b) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $14.8 , $15.1 and $15.2 for 2017 , 2016 and 2015 , respectively. (c) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
Schedule of revenues from services by geographical region	Further breakdown of revenues from services by geographical region was as follows: Revenues from Services 2017 2016 2015 United States $ 2,758.5 $ 2,950.2 $ 3,115.6 France 5,493.9 4,857.3 4,684.1 Italy 1,479.4 1,170.7 1,230.2 United Kingdom 1,619.2 1,819.7 2,118.4 Total Foreign 18,275.8 16,703.9 16,214.3
Schedule of segment information - depreciation and amortization expense, earnings from equity investment, total assets, equity investments, long-lived assets and additions to long-lived assets	Year Ended December 31 2017 2016 2015 Depreciation and Amortization Expense Americas: United States $ 9.3 $ 9.9 $ 9.3 Other Americas 2.5 2.7 2.9 11.8 12.6 12.2 Southern Europe: France 12.3 11.0 10.1 Italy 1.8 1.9 1.9 Other Southern Europe 4.7 3.5 3.2 18.8 16.4 15.2 Northern Europe 10.6 10.9 8.9 APME 4.7 5.3 4.7 Right Management 3.7 3.9 3.7 Corporate expenses 0.2 0.2 0.2 Intangible asset amortization expense (a) 34.6 36.0 32.8 $ 84.4 $ 85.3 $ 77.7 Earnings from Equity Investments Americas: United States $ — $ — $ — Other Americas — — — — — — Southern Europe: France — — 0.4 Italy — — — Other Southern Europe 15.0 3.6 7.5 15.0 3.6 7.9 Northern Europe — — 0.1 APME — — — Right Management — — — $ 15.0 $ 3.6 $ 8.0 (a) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately. As of December 31 2017 2016 2015 Total Assets Americas: United States $ 1,781.4 $ 1,718.9 $ 1,708.5 Other Americas 329.2 314.4 304.9 2,110.6 2,033.3 2,013.4 Southern Europe: France 2,753.1 2,104.8 1,926.3 Italy 436.7 294.9 267.1 Other Southern Europe 596.2 490.1 484.7 3,786.0 2,889.8 2,678.1 Northern Europe 1,569.0 1,292.4 1,197.7 APME 780.7 612.8 533.6 Right Management 138.1 136.6 143.9 Corporate (a) 499.2 609.3 950.8 $ 8,883.6 $ 7,574.2 $ 7,517.5 Equity Investments Americas: United States $ — $ — $ — Other Americas — — — — — — Southern Europe: France — 0.2 — Italy 0.4 0.4 0.2 Other Southern Europe 157.2 139.1 136.3 157.6 139.7 136.5 Northern Europe — 0.1 1.4 APME 0.1 — — Right Management — — — Corporate 1.0 6.0 — $ 158.7 $ 145.8 $ 137.9 (a) Corporate assets include assets that were not used in the operations of any segment, the most significant of which were purchased intangibles and cash. As of and Year Ended December 31 2017 2016 2015 Long-lived Assets (a) Americas: United States $ 20.6 $ 27.7 $ 26.0 Other Americas 6.1 6.3 7.3 26.7 34.0 33.3 Southern Europe: France 47.9 39.7 39.2 Italy 4.9 4.4 4.7 Other Southern Europe 24.3 18.3 14.2 77.1 62.4 58.1 Northern Europe 28.0 25.4 30.5 APME 21.4 17.9 19.4 Right Management 8.0 10.7 10.5 Corporate 0.1 0.2 0.4 $ 161.3 $ 150.6 $ 152.2 Additions to Long-Lived Assets Americas: United States $ 6.7 $ 11.9 $ 10.1 Other Americas 2.4 1.9 2.4 9.1 13.8 12.5 Southern Europe: France 15.2 13.3 10.3 Italy 1.7 1.7 2.4 Other Southern Europe 8.8 8.9 5.4 25.7 23.9 18.1 Northern Europe 11.8 8.5 12.1 APME 6.3 3.9 4.5 Right Management 1.0 4.5 4.7 Corporate — — 0.4 $ 53.9 $ 54.6 $ 52.3 (a) Further breakdown of long-lived assets by geographical region was as follows: Long-Lived Assets 2017 2016 2015 United States $ 24.9 $ 33.9 $ 32.3 France 49.1 40.9 40.4 Italy 4.9 4.4 4.7 United Kingdom 9.1 9.0 10.3 Total Foreign 136.4 116.7 119.9
Schedule of long-lived assets by geographical region	Further breakdown of long-lived assets by geographical region was as follows: Long-Lived Assets 2017 2016 2015 United States $ 24.9 $ 33.9 $ 32.3 France 49.1 40.9 40.4 Italy 4.9 4.4 4.7 United Kingdom 9.1 9.0 10.3 Total Foreign 136.4 116.7 119.9

Quarterly Data (Unaudited) (Tab

Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly data	First Quarter Second Quarter Third Quarter Fourth Quarter Total Year Ended December 31, 2017 Revenues from services $ 4,757.2 $ 5,174.8 $ 5,464.8 $ 5,637.5 $ 21,034.3 Gross profit 787.8 861.7 900.6 934.5 3,484.6 Operating profit (a) 127.0 194.6 227.9 238.7 788.2 Net earnings (b) 74.4 117.0 137.7 216.3 545.4 Net earnings per share — basic $ 1.10 $ 1.74 $ 2.06 $ 3.26 $ 8.13 Net earnings per share — diluted (c) 1.09 1.72 2.04 3.22 8.04 Dividends per share — 0.93 — 0.93 1.86 Year Ended December 31, 2016 Revenues from services $ 4,587.7 $ 5,022.1 $ 5,088.2 $ 4,956.1 $ 19,654.1 Gross profit 773.8 860.7 858.3 841.0 3,333.8 Operating profit 131.7 196.0 211.1 212.0 750.8 Net earnings 71.7 115.4 129.2 127.4 443.7 Net earnings per share — basic $ 0.98 $ 1.61 $ 1.89 $ 1.89 $ 6.33 Net earnings per share — diluted 0.98 1.60 1.87 1.87 6.27 Dividends per share — 0.86 — 0.86 1.72 (a) Included restructuring costs of $24.0 and $10.5 recorded in the first and second quarter, respectively. (b) Included net tax benefits related to the Tax Act and French tax reform of $73.7 in the fourth quarter. (c) Included in the results are restructuring costs per diluted share of $(0.30) and $(0.10) for the first and second quarter, respectively, and net tax benefits per diluted share of $1.10 for the fourth quarter.

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Nature of Operations (Details)	Dec. 31, 2017countryoffice
Accounting Policies [Abstract]
Number of offices worldwide (nearly) | office	2,700
Number of countries and territories | country	80

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Basis of Consolidation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Investments value	$ 158.7	$ 145.8	$ 137.9
Unremitted earning from investments	$ 103.9	$ 88.9

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Revenues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Franchise fees	$ 23,700,000	$ 23,300,000	$ 24,200,000
Current portion of deferred revenue	46,500,000	38,700,000
Long-term portion of deferred revenue	$ 1,500,000	$ 2,400,000

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - Allowance for doubtful accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Bad debt expense	$ 18.1	$ 20.4	$ 16.3
Write-offs	$ 17.6	$ 16.9	$ 20.3

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Advertising expenses	$ 26.6	$ 24.4	$ 28.8

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Restructuring Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Costs [Abstract]
Restructuring costs	$ 34,500,000
Restructuring reserve [Roll Forward]
Balance at beginning of period	4,500,000	$ 16,400,000
Costs paid or utilized	(25,500,000)	(11,900,000)
Severance Costs	24,700,000
Office closure costs	9,800,000
Balance at end of year	13,500,000	4,500,000
Reportable segments | Americas
Restructuring reserve [Roll Forward]
Balance at beginning of period	400,000	3,500,000
Costs paid or utilized	(5,000,000)	(3,100,000)
Severance Costs	5,800,000
Office closure costs	500,000
Balance at end of year	1,700,000	400,000
Reportable segments | Americas | United States | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance at beginning of period	400,000	2,900,000
Costs paid or utilized	(3,100,000)	(2,500,000)
Severance Costs	3,700,000
Office closure costs	500,000
Balance at end of year	1,500,000	400,000
Reportable segments | Southern Europe
Restructuring reserve [Roll Forward]
Balance at beginning of period	1,300,000	1,700,000
Costs paid or utilized	(400,000)	(400,000)
Severance Costs	0
Office closure costs	0
Balance at end of year	900,000	1,300,000
Reportable segments | Southern Europe | France | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance at beginning of period	1,300,000	1,500,000
Costs paid or utilized	(400,000)	(200,000)
Balance at end of year	900,000	1,300,000
Reportable segments | Southern Europe | Italy | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance at beginning of period	0	0
Balance at end of year	0	0
Reportable segments | Northern Europe
Restructuring reserve [Roll Forward]
Balance at beginning of period	2,600,000	8,500,000
Costs paid or utilized	(16,800,000)	(5,900,000)
Severance Costs	15,600,000
Office closure costs	8,200,000
Balance at end of year	9,600,000	2,600,000
Reportable segments | APME
Restructuring reserve [Roll Forward]
Balance at beginning of period	100,000	1,700,000
Costs paid or utilized	(1,500,000)	(1,600,000)
Severance Costs	900,000
Office closure costs	500,000
Balance at end of year	0	100,000
Reportable segments | Right Management
Restructuring reserve [Roll Forward]
Balance at beginning of period	100,000	800,000
Costs paid or utilized	(900,000)	(700,000)
Severance Costs	1,400,000
Office closure costs	600,000
Balance at end of year	1,200,000	100,000
Corporate
Restructuring reserve [Roll Forward]
Balance at beginning of period	0	200,000
Costs paid or utilized	(900,000)	(200,000)
Severance Costs	1,000,000
Office closure costs	0
Balance at end of year	$ 100,000	$ 0

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair value measured on a recurring basis
Assets
Deferred compensation plan assets	$ 99.1	$ 86.8
Total assets measured at fair value	99.1	86.8
Liabilities
Foreign currency forward contracts	0.1	0.2
Total liabilities measured at fair value	0.1	0.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on a recurring basis
Assets
Deferred compensation plan assets	99.1	86.8
Total assets measured at fair value	99.1	86.8
Liabilities
Foreign currency forward contracts	0	0
Total liabilities measured at fair value	0	0
Significant Other Observable Inputs (Level 2) | Estimate of fair value measurement
Liabilities
Euro-denominated notes	939.9	831.6
Significant Other Observable Inputs (Level 2) | Carrying value
Liabilities
Euro-denominated notes	897.8	785.2
Significant Other Observable Inputs (Level 2) | Fair value measured on a recurring basis
Assets
Deferred compensation plan assets	0	0
Total assets measured at fair value	0	0
Liabilities
Foreign currency forward contracts	0.1	0.2
Total liabilities measured at fair value	0.1	0.2
Significant Unobservable Inputs (Level 3) | Fair value measured on a recurring basis
Assets
Deferred compensation plan assets	0	0
Total assets measured at fair value	0	0
Liabilities
Foreign currency forward contracts	0	0
Total liabilities measured at fair value	$ 0	$ 0

Summary of Significant Accoun46

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 1,343	$ 1,239.9	$ 1,257.4
Accumulated impairment loss	513.4	513.4	513.4
Finite-lived:
Gross	472.9	443.4
Accumulated Amortization	339.9	299.8
Net	133	143.6
Indefinite-lived:
Gross	151	150.8
Net	151	150.8
Total intangible assets
Gross	623.9	594.2
Accumulated Amortization	339.9	299.8
Net	284	294.4
Amortization expense related to intangibles	34.6	36	$ 32.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	34.5
2,019	29.7
2,020	24.8
2,021	13.8
2,022	$ 10.2
Income approach weight for goodwill impairment for certain reporting units	75.00%
Market approach weight for goodwill impairment for certain reporting units	25.00%
Minimum
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Discount rate for goodwill impairment test (as a percent)	10.10%
Maximum
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Discount rate for goodwill impairment test (as a percent)	13.30%
Tradenames
Indefinite-lived:
Gross	$ 52	52
Net	52	52
Accumulated impairment loss	139.5	139.5
Reacquired franchise rights
Indefinite-lived:
Gross	99	98.8
Net	99	98.8
Customer relationships
Finite-lived:
Gross	453.6	426.2
Accumulated Amortization	325.2	287.2
Net	$ 128.4	139
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Weighted-average useful lives	13 years
Other
Finite-lived:
Gross	$ 19.3	17.2
Accumulated Amortization	14.7	12.6
Net	$ 4.6	$ 4.6
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Weighted-average useful lives	4 years

Summary of Significant Accoun47

Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Percentage of ownership in Swiss franchise	49.00%
Swiss franchise investment portfolio market value	$ 234.8	$ 207
Swiss franchise realized gains	14.7	2.9	$ 2.3
Swiss franchise realized losses	3.8	1	1.1
Other-than-temporary impairment gains	$ (1.6)	$ (0.3)	$ (0.2)

Summary of Significant Accoun48

Summary of Significant Accounting Policies - Capitalized Software for Internal Use (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Net capitalized software balance	$ 3.5	$ 3.2
Amortization expense related to capitalized software cost	$ 1.3	$ 1.9	$ 1.7
Computer software | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Computer software | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years

Summary of Significant Accoun49

Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment	$ 633.4	$ 567
Land
Property, Plant and Equipment [Line Items]
Property and equipment	3.4	5.5
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment	$ 14.5	16.2
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Furniture, fixtures, and autos
Property, Plant and Equipment [Line Items]
Property and equipment	$ 172.3	157.6
Furniture, fixtures, and autos | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Furniture, fixtures, and autos | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 137.1	117.8
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	2 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 306.1	$ 269.9

Summary of Significant Accoun50

Summary of Significant Accounting Policies - Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 28, 2016	Oct. 29, 2015
Equity, Class of Treasury Stock [Line Items]
Shares authorized to be repurchased (in shares)					6,000,000	6,000,000
Shares repurchased (in shares)		1,900,000	6,600,000	6,700,000
Total cost of shares repurchased	$ 7.7	$ 203.9	$ 482.2	$ 587.9
Dividends declared (in dollars per share)		$ 1.86	$ 1.72	$ 1.60
Total dividend payments		$ 123.7	$ 118.4	$ 121
Net earnings, net of tax, attributable to noncontrolling interests		$ 6.5	$ 10.1	$ 6.6
2012 Authorization
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)				6,000,000
2015 Authorization
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)			5,300,000	700,000
Shares remaining authorized for repurchase (in shares)		0
2016 Authorization
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)			1,300,000
Shares remaining authorized for repurchase (in shares)		2,800,000

Summary of Significant Accoun51

Summary of Significant Accounting Policies - Payroll Tax Credit (Details) € in Millions, $ in Millions	1 Months Ended						12 Months Ended
	Mar. 31, 2017USD ($)	Mar. 31, 2017EUR (€)	Mar. 31, 2016USD ($)	Mar. 31, 2016EUR (€)	Jul. 31, 2015USD ($)	Jul. 31, 2015EUR (€)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Multiplier for payroll tax credits							2.5
Payment period							3 years
Net proceeds from sale of tax credits	$ 143.5	€ 133	$ 143.1	€ 129.9	$ 132.8	€ 120.1
Tax Credit Carryforward [Line Items]
Percentage of eligible wages for tax credit							7.00%	6.00%	6.00%	6.00%	4.00%

Summary of Significant Accoun52

Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Unrealized gain on investments, net of income taxes	$ 15.3	$ 18.6
Other components of net benefit cost	$ 1	$ (5.3)

Acquisitions (Details)

Acquisitions (Details) € in Millions, $ in Millions	Sep. 03, 2015USD ($)	Sep. 03, 2015EUR (€)	Mar. 31, 2017USD ($)	Mar. 31, 2017EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2016EUR (€)	Sep. 03, 2015EUR (€)
Business Acquisition [Line Items]
Total cash consideration paid for acquisitions, net of cash acquired					$ 32.7	$ 57.6	$ 260.5
Payments of contingent considerations for acquisitions					13	2.9	0
Finite-lived intangible assets					133	143.6
Amortization expense 2018					34.5
Amortization expense 2019					29.7
Amortization expense 2020					24.8
Amortization expense 2021					13.8
Amortization expense 2022					10.2
Goodwill					1,343	1,239.9	1,257.4
Goodwill acquired					$ 35	24.4
Customer relationships
Business Acquisition [Line Items]
Useful life					13 years
Finite-lived intangible assets					$ 128.4	139
7S
Business Acquisition [Line Items]
Total cash consideration paid for acquisitions, net of cash acquired	$ 140.4	€ 125.3
Transaction costs associated with acquisition							$ 3.4
Net acquired assets	153									€ 136.5
Intangible assets acquired during the period	48.8	43.5
Payments of contingent considerations for acquisitions			$ 10.3	€ 9.6
Goodwill					$ 119.1			€ 106.2
7S | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired during the period	$ 44.2	€ 39.4
Useful life					10 years
Finite-lived intangible assets					$ 36.3	36		€ 30.2	€ 34.2
Amortization expense 2018					4.8
Amortization expense 2019					4.8
Amortization expense 2020					4.8
Amortization expense 2021					4.8
Amortization expense 2022					4.8
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Intangible assets acquired during the period					$ 13.3	$ 6.6

Share-Based Compensation Plan54

Share-Based Compensation Plans - Share-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation									$ 28.7	$ 27.1	$ 31.1
Income tax benefit recognized related to share-based compensation									23.7	7.4	16.9
Consideration received from share-based awards									$ 44.2	19.7	70.1
Excess income tax benefit recognized related to share-based compensation awards										$ 0.8	$ 7.4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net earnings per share - diluted (in dollars per share)	$ 3.22	$ 2.04	$ 1.72	$ 1.09	$ 1.87	$ 1.87	$ 1.60	$ 0.98	$ 8.04	$ 6.27	$ 5.40
ASU 2016-09
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit related to share-based compensation awards									$ 6.2
Net earnings per share - diluted (in dollars per share)									$ 0.09

Share-Based Compensation Plan55

Share-Based Compensation Plans - Stock Options Narratives (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period	4 years
Expiration period	10 years
Share-based compensation	$ 3.7	3	3.2
Fair value of options vested	2.3	$ 2.5	$ 3.2
Total unrecognized compensation cost, net of estimated forfeitures	$ 2.3
Total unrecognized compensation cost, weighted-average period for recognition	1 year 2 months 12 days
Weighted average of daily historical volatility of Company's stock price, weight (as a percent)	75.00%
Implied volatility based on exchange traded options for Company's common stock, weight (as a percent)	25.00%
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 25.58	$ 19.68	$ 21.66
Stock option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price (as a percent)	100.00%

Share-Based Compensation Plan56

Share-Based Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding at beginning of period (in shares)	1,127	1,272	2,484
Granted (in shares)	145	166	147
Exercised (in shares)	(680)	(279)	(1,255)
Expired or cancelled (in shares)	(18)	(32)	(104)
Outstanding at end of period (in shares)	574	1,127	1,272
Vested or expected to vest (in shares)	571	1,122	1,267
Exercisable (in shares)	220	756	911
Wtd. Avg. Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 66	$ 64	$ 59
Granted (in dollars per share)	97	75	77
Exercised (in dollars per share)	64	63	56
Expired or cancelled (in dollars per share)	75	67	56
Outstanding at end of period (in dollars per share)	77	66	64
Vested or expected to vest (in dollars per share)	77	66	64
Exercisable (in dollars per share)	$ 65	$ 62	$ 62
Wtd. Avg. Remaining Contractual Term and Aggregate Intrinsic Value
Outstanding (in years)	7 years 1 month 6 days	4 years 10 months 24 days	5 years 2 months 12 days
Vested or expected to vest (in years)	7 years 1 month 6 days	4 years 10 months 24 days	5 years 2 months 12 days
Exercisable (in years)	5 years 3 months 18 days	3 years 3 months 18 days	4 years
Exercised	$ 24	$ 5	$ 39
Outstanding	28	26	26
Exercisable	$ 14	$ 20	$ 20

Share-Based Compensation Plan57

Share-Based Compensation Plans - Options Outstanding and Exercisable (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017$ / sharesshares
$27-$49
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 27
Exercise price range, upper range limit (in dollars per share)	49
$50-$59
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	50
Exercise price range, upper range limit (in dollars per share)	59
$60-$75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	60
Exercise price range, upper range limit (in dollars per share)	75
$76-$97
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	76
Exercise price range, upper range limit (in dollars per share)	$ 97
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares (in shares) | shares	574
Options outstanding, weighted-average remaining contractual life	7 years 1 month 6 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 77
Options exercisable, shares (in shares) | shares	220
Options exercisable, weighted-average exercise price (in dollars per share)	$ 65
Stock option | $27-$49
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares (in shares) | shares	35
Options outstanding, weighted-average remaining contractual life	2 years 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 39
Options exercisable, shares (in shares) | shares	35
Options exercisable, weighted-average exercise price (in dollars per share)	$ 39
Stock option | $50-$59
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares (in shares) | shares	59
Options outstanding, weighted-average remaining contractual life	3 years 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 53
Options exercisable, shares (in shares) | shares	59
Options exercisable, weighted-average exercise price (in dollars per share)	$ 53
Stock option | $60-$75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares (in shares) | shares	163
Options outstanding, weighted-average remaining contractual life	7 years 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 75
Options exercisable, shares (in shares) | shares	39
Options exercisable, weighted-average exercise price (in dollars per share)	$ 73
Stock option | $76-$97
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares (in shares) | shares	317
Options outstanding, weighted-average remaining contractual life	7 years 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 87
Options exercisable, shares (in shares) | shares	87
Options exercisable, weighted-average exercise price (in dollars per share)	$ 78

Share-Based Compensation Plan58

Share-Based Compensation Plans - Estimated Fair Value of Share Awards (Details) - Stock option	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate (as a percent)	2.00%	1.40%	1.60%
Expected dividend yield (as a percent)	2.00%	2.10%	1.50%
Expected volatility (as a percent)	31.00%	33.00%	32.00%
Expected term (years)	6 years	6 years	6 years

Share-Based Compensation Plan59

Share-Based Compensation Plans - Deferred Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1.4	1.1	0.8
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 12.3	$ 13.8	$ 9.9
In lieu of annual cash retainer | Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	43,442	39,805	36,091
Additional compensation for board service | Deferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	9,857	8,388	7,920
Additional compensation for board service | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted at period end (in shares)	9,792	9,966	13,860
Stock units canceled (in shares)			1,752

Share-Based Compensation Plan60

Share-Based Compensation Plans - Restricted Stock Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term for restrictions to lapse	6 years
Share-based compensation	$ 12.3	$ 13.8	$ 9.9
Total unrecognized compensation cost, net of estimated forfeitures	$ 14.3
Total unrecognized compensation cost, weighted-average period for recognition	1 year 10 months 24 days

Share-Based Compensation Plan61

Share-Based Compensation Plans - Restricted Stock Activity (Details) - Restricted stock - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Unvested at beginning of period (in shares)	451	405	463
Granted (in shares)	167	232	179
Vested (in shares)	(133)	(172)	(217)
Forfeited (in shares)	(37)	(14)	(20)
Unvested at end of period (in shares)	448	451	405	463
Wtd. Avg. Price Per Share
Unvested at beginning of period (in dollars per share)	$ 70	$ 64	$ 57
Granted (in dollars per share)	98	75	76
Vested (in dollars per share)	79	62	59
Forfeited (in dollars per share)	80	76	60
Unvested at end of period (in dollars per share)	$ 77	$ 70	$ 64	$ 57
Equity Other Than Options, Additional [Abstract]
Unvested (in years)	1 year 2 months 12 days	1 year 4 months 24 days	1 year 3 months 18 days	1 year 2 months 12 days
Unvested	$ 56

Share-Based Compensation Plan62

Share-Based Compensation Plans - Performance Share Units (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Payout Levels (in units):
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Performance share units
Payout Levels (in units):
Threshold Award (in shares)	57,563	65,141	82,298	94,608
Target Award (in shares)	115,125	130,282	164,595	189,215
Outstanding Award (in shares)	230,250	260,564	329,190	378,430
Share-based compensation	$ 10.8	$ 9.1	$ 17.1
Performance share units | February 11, 2015
Payout Levels (in units):
Payout Achieved Over Performance Period (in shares)	219,519
Performance share units | February 11, 2014 and May 1, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued (in shares)	335,179
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period range	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period range	3 years

Share-Based Compensation Plan63

Share-Based Compensation Plans - Other Stock Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 28.7	$ 27.1	$ 31.1
Savings Related Share Option Scheme for United Kingdom
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period (in years)	1 year
Purchase price as percentage of market value (not less than)	85.00%
Payroll deduction period to accumulate funds used for share-based payment award	60 months
Share-based compensation	$ 0.5	$ 0.1	$ 0.1
Vesting period one | Savings Related Share Option Scheme for United Kingdom
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period	3 years
Vesting period two | Savings Related Share Option Scheme for United Kingdom
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period	5 years
Vesting period three | Savings Related Share Option Scheme for United Kingdom
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting period	7 years

Net Earnings Per Share - Calcul

Net Earnings Per Share - Calculation of Net Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net earnings available to common shareholders	$ 216.3	$ 137.7	$ 117	$ 74.4	$ 127.4	$ 129.2	$ 115.4	$ 71.7	$ 545.4	$ 443.7	$ 419.2
Weighted-average common shares outstanding (in millions):
Weighted-average common shares outstanding - basic (in shares)									67.1	70.1	76.8
Weighted-average common shares outstanding - diluted (in shares)									67.9	70.8	77.7
Net earnings per share - basic (in dollars per share)	$ 3.26	$ 2.06	$ 1.74	$ 1.10	$ 1.89	$ 1.89	$ 1.61	$ 0.98	$ 8.13	$ 6.33	$ 5.46
Net earnings per share - diluted (in dollars per share)	$ 3.22	$ 2.04	$ 1.72	$ 1.09	$ 1.87	$ 1.87	$ 1.60	$ 0.98	$ 8.04	$ 6.27	$ 5.40
Stock Options
Weighted-average common shares outstanding (in millions):
Effect of dilutive securities									0.2	0.2	0.5
Non-Stock Option Awards
Weighted-average common shares outstanding (in millions):
Effect of dilutive securities									0.6	0.5	0.4

Net Earnings Per Share - Antidi

Net Earnings Per Share - Antidilutive Awards (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price ranges (in dollars per share)	$ 0	$ 93	$ 93
Weighted-average remaining life	0 days	4 months 24 days	1 year 4 months 24 days
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares)	0	20	20

Income Taxes Tax Cuts and Jobs

Income Taxes Tax Cuts and Jobs Act of 2017 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Total impact of the Tax Act		$ (77.2)
Benefit to tax expense due to reduction of DTL recorded for non-US earnings considered not permanently invested		(275.8)
Tax expense related to non-United States withholding tax		5.5
Transition tax expense		$ 170.2
Transition tax expense payment period		8 years
Transition tax expense, annual percentage due for the first five years		8.00%
Transition tax expense, annual percentage due in year six		15.00%
Transition tax expense, annual percentage due in year seven		20.00%
Transition tax expense, annual percentage due in year eight		25.00%
Tax expense from certain foreign tax credit benefits disallowed		$ 3.8
Impact on net deferred assets and liabilities, excluding the provision for unremitted earnings		1.2
Impact on prior year unrecognized tax benefits		$ 23.4
United States
Income Tax [Line Items]
Statutory rate		35.00%
Scenario, Forecast | United States
Income Tax [Line Items]
Statutory rate	21.00%

Income Taxes French Tax Reform

Income Taxes French Tax Reform (Details) - France - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2017
Income Tax [Line Items]
Statutory rate		33.30%
Tax expense related to revaluation		$ 3.5
Scenario, Forecast
Income Tax [Line Items]
Statutory rate	25.00%

Income Taxes - Income Tax Provi

Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal	$ 211.7	$ 35.6	$ (8.4)
State	8.4	4	0
Non-United States	168.6	144	158.7
Total current	388.7	183.6	150.3
Deferred
Federal	(178.2)	69.7	92.9
State	(0.8)	0.5	1.8
Non-United States	(17.8)	3.8	(3.5)
Total deferred	(196.8)	74	91.2
Total provision	$ 191.9	$ 257.6	$ 241.5

Income Taxes - Income Tax Recon

Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 21, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Reconciliation [Abstract]
Income tax based on statutory rate		$ 258.1		$ 245.5	$ 231.2
Increase (decrease) resulting from:
Repatriation of non-United States earnings		69.7
Repatriation of non-United States earnings, credit				(10.5)	(16.9)
State income taxes, net of federal benefit		1.1		2.2	2.7
Change in valuation allowance		(6.9)		(6)	3.3
United States Tax Act and French tax reform	$ (73.7)	(73.7)		0	0
Other, net		2.4		8.9	0.8
Total provision		191.9		257.6	241.5
French business tax, gross		72.1		63.1	61.5
French business tax
Increase (decrease) resulting from:
Non-United States tax rate difference		46.9		41	40
French CICE
Increase (decrease) resulting from:
Non-United States tax rate difference		(77.1)		0	0
Repatriation of non-United States earnings, credit				(58.9)	(56.2)
Expense recorded prior to the Tax Act
Increase (decrease) resulting from:
Repatriation of non-United States earnings			$ 83.3
Other
Increase (decrease) resulting from:
Non-United States tax rate difference		(28.6)		(23.5)	(19.6)
Other | Benefits related to French earnings that are deemed to be permanently invested
Increase (decrease) resulting from:
Non-United States tax rate difference		$ (2.4)		$ (1.8)	$ (1.5)
United States
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate (as a percent)		35.00%

Income Taxes - Narratives (Deta

Income Taxes - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred tax asset	$ 101	$ 81.4
Deferred tax liability	32.3	222.2
Deferred tax asset on net operating losses	104.1	92.7
Valuation allowance, net operating losses	68.4
Pretax income of non-United States operations	514.9	482.2	$ 511.2
Unremitted earnings of non-United States subsidiaries that are considered to be permanently invested	264.3
Unremitted earnings of non-United States subsidiaries that may be remitted	1,746.3
Deferred tax liability, undistributed foreign earnings	5.5	164.8
Interest and penalties related to unrecognized tax benefits	$ 0.2	$ 0.3	$ 12.1

Income Taxes - Deferred Income

Income Taxes - Deferred Income Taxes Temporary Differences (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Future Income Tax Benefits (Expense)
Accrued payroll taxes and insurance	$ 17.3	$ 30.6
Employee compensation payable	20.2	26.6
Pension and postretirement benefits	49	60.7
Intangible assets	(103)	(146.8)
Repatriation of non-United States earnings	(5.5)	(164.8)
Intercompany loans denominated in foreign currencies	(13.5)	(74.2)
Net operating losses	104.1	92.7
Other	77.6	120.7
Valuation allowance	(77.5)	(86.3)
Total future tax benefits	68.7
Total future tax expense		(140.8)
Deferred tax asset	101	81.4
Deferred tax liability	(32.3)	(222.2)
Total future tax benefits	$ 68.7
Total future tax expense		$ (140.8)

Income Taxes - Operating Loss C

Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2017USD ($)
United States Federal and Non-United States
Income Tax Contingency [Line Items]
2,018	$ 1.5
2,019	6.5
2,020	3.3
2,021	5.3
2,022	3.4
Thereafter	25
No expirations	356.2
Total net operating loss carryforwards	401.2
United States State
Income Tax Contingency [Line Items]
2,018	3
2,019	4
2,020	0.2
2,021	3.8
2,022	0
Thereafter	187.7
No expirations	0
Total net operating loss carryforwards	$ 198.7

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits, beginning of year	$ 23.8	$ 19	$ 23
Increases in prior year tax positions	27.1	4.1	2.3
Decreases in prior year tax positions	(1.2)	(1.7)	(0.5)
Increases for current year tax positions	6.6	4.1	3.1
Expiration of statute of limitations and audit settlements	(10.2)	(1.7)	(8.9)
Gross unrecognized tax benefits, end of year	46.1	23.8	19
Potential interest and penalties	20.4	20.2	19.9
Balance, end of year	$ 66.5	$ 44	$ 38.9

Goodwill - Changes in Goodwill

Goodwill - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,239.9	$ 1,257.4
Goodwill acquired	35	24.4
Currency impact and other	68.1	(41.9)
Balance at end of period	1,343	1,239.9
Accumulated impairment loss	513.4	513.4	$ 513.4
Right Management
Goodwill [Roll Forward]
Balance at beginning of period	62.1
Balance at end of period	62.1	62.1
Reportable segments | Americas
Goodwill [Roll Forward]
Balance at beginning of period	516.4	515.7
Goodwill acquired	0	0
Currency impact and other	2.8	0.7
Balance at end of period	519.2	516.4
Reportable segments | Americas | United States | Reportable subsegments
Goodwill [Roll Forward]
Balance at beginning of period	476.5	476.9
Balance at end of period	476.5	476.5
Reportable segments | Southern Europe
Goodwill [Roll Forward]
Balance at beginning of period	97	97.2
Goodwill acquired	10	0
Currency impact and other	14.9	(0.2)
Balance at end of period	121.9	97
Reportable segments | Southern Europe | France | Reportable subsegments
Goodwill [Roll Forward]
Balance at beginning of period	66.8	69
Balance at end of period	76.3	66.8
Reportable segments | Southern Europe | Italy | Reportable subsegments
Goodwill [Roll Forward]
Balance at beginning of period	4.4	4.5
Balance at end of period	5	4.4
Reportable segments | Northern Europe
Goodwill [Roll Forward]
Balance at beginning of period	421.9	441.9
Goodwill acquired	0.1	22.3
Currency impact and other	46.1	(42.3)
Balance at end of period	468.1	421.9
Reportable segments | APME
Goodwill [Roll Forward]
Balance at beginning of period	77	75.6
Goodwill acquired	24.9	1.5
Currency impact and other	4.3	(0.1)
Balance at end of period	106.2	77
Reportable segments | Right Management
Goodwill [Roll Forward]
Balance at beginning of period	62.1	62.1
Goodwill acquired	0	0
Currency impact and other	0	0
Balance at end of period	62.1	62.1
Corporate
Goodwill [Roll Forward]
Balance at beginning of period	65.5	64.9
Goodwill acquired	0	0.6
Currency impact and other	0	0
Balance at end of period	65.5	$ 65.5
Corporate | Jefferson Wells
Goodwill [Roll Forward]
Balance at end of period	$ 55.5

Goodwill - Goodwill by Reportin

Goodwill - Goodwill by Reporting Unit (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 1,343	$ 1,239.9	$ 1,257.4
United States
Goodwill [Line Items]
Goodwill	532	532
Germany
Goodwill [Line Items]
Goodwill	135.4	121.4
Netherlands
Goodwill [Line Items]
Goodwill	126.5	110.9
United Kingdom
Goodwill [Line Items]
Goodwill	89.2	81.4
France
Goodwill [Line Items]
Goodwill	76.3	66.8
Right Management
Goodwill [Line Items]
Goodwill	62.1	62.1
Other reporting units
Goodwill [Line Items]
Goodwill	$ 321.5	$ 265.3

Debt - Short-Term Debt (Details

Debt - Short-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Short-term borrowings	$ 49.1	$ 39.5
Weighted-average interest rates (as a percent)	7.90%	11.10%

Debt - Debt (Details)

Debt - Debt (Details) - Uncommitted credit lines	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Credit lines, maximum borrowing capacity	$ 324,100,000
Credit lines, remaining borrowing capacity	274,400,000
First, second, and fourth quarters
Line of Credit Facility [Line Items]
Credit lines, maximum borrowing capacity	300,000,000
Third quarter
Line of Credit Facility [Line Items]
Credit lines, maximum borrowing capacity	$ 600,000,000

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 898.4	$ 785.9
Less - current maturities	420.3	0.3
Long-term debt	478.1	785.6
€400 due September 2022
Debt Instrument [Line Items]
Long-term debt	477.8	417.7
€350 due June 2018
Debt Instrument [Line Items]
Long-term debt	420	367.5
Other
Debt Instrument [Line Items]
Long-term debt	$ 0.6	$ 0.7

Debt - Euro Notes (Details)

Debt - Euro Notes (Details) - Senior notes - EUR (€)	Sep. 11, 2015	Dec. 31, 2017
Notes due September 2022
Debt Instrument [Line Items]
Principal amount	€ 400,000,000
Interest rate (as a percent)	1.875%
Net proceeds from the notes	€ 397,400,000
Discounted issue price (as a percent)	99.753%
Effective interest rate (as a percent)	1.913%
Notes due June 2018
Debt Instrument [Line Items]
Principal amount		€ 350,000,000
Interest rate (as a percent)		4.50%
Discounted issue price (as a percent)		99.974%
Effective interest rate (as a percent)		4.505%

Debt - Revolving Credit Agreeme

Debt - Revolving Credit Agreement (Details) - Revolving credit facility	Sep. 16, 2015	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Credit lines, maximum borrowing capacity		$ 600,000,000
Five Year Credit Agreement
Line of Credit Facility [Line Items]
Credit agreement term	5 years
Credit lines, maximum borrowing capacity		600,000,000
Portion which may be used for the issuance of stand-by letters of credit (up to)		150,000,000
Borrowings under Credit Agreement		0	$ 0
Outstanding letters of credit		800,000	800,000
Credit lines, remaining borrowing capacity		$ 599,200,000	$ 599,200,000
Facility fee (as a percent)		0.125%
Credit spread (as a percent)		1.00%
Maximum Debt-to-EBITDA ratio		3.5
Minimum fixed charge coverage ratio		1.5

Debt - Debt Maturities (Details

Debt - Debt Maturities (Details) $ in Millions	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,019	$ 0.3
2,020	0
2,021	0
2,022	$ 477.8

Retirement and Deferred Compe82

Retirement and Deferred Compensation Plans - Reconciliation of Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
An Additional German Plan
Funded Status at End of Year
Funded status, end of year	$ (61.8)	$ (56.8)
United States Plans
Change in Benefit Obligation
Benefit obligation, beginning of year	53.1	53.1
Service cost	0	0
Interest cost	1.7	1.8
Curtailment and settlement	0	0
Transfers	0	0
Actuarial (gain) loss	3	2.2
Plan participant contributions	0	0
Benefits paid	(4.1)	(4)
Currency exchange rate changes	0	0
Benefit obligation, end of year	53.7	53.1	$ 53.1
Change in Plan Assets
Fair value of plan assets, beginning of year	37.3	37.2
Actual return on plan assets	3	1.7
Settlement	0	0
Transfers	0	0
Plan participant contributions	0	0
Company contributions	2.5	2.4
Benefits paid	(4.1)	(4)
Currency exchange rate changes	0	0
Fair value of plan assets, end of year	38.7	37.3	37.2
Funded Status at End of Year
Funded status, end of year	(15)	(15.8)
Amounts Recognized
Noncurrent assets	15.3	14.3
Current liabilities	(2.5)	(2.5)
Noncurrent liabilities	(27.8)	(27.6)
Net amount recognized	(15)	(15.8)
Non-United States Plans
Change in Benefit Obligation
Benefit obligation, beginning of year	416	326.1
Service cost	10.1	8
Interest cost	8.9	10
Curtailment and settlement	0	(29)
Transfers	9.3	105.4
Actuarial (gain) loss	1	39.8
Plan participant contributions	0.2	0.2
Benefits paid	(9.5)	(7.7)
Currency exchange rate changes	53.5	(36.8)
Benefit obligation, end of year	489.5	416	326.1
Change in Plan Assets
Fair value of plan assets, beginning of year	324.5	314.7
Actual return on plan assets	13.4	44.6
Settlement	0	(26.1)
Transfers	1.8	34.9
Plan participant contributions	0.2	0.2
Company contributions	7.9	0.5
Benefits paid	(9.5)	(7.7)
Currency exchange rate changes	38.4	(36.6)
Fair value of plan assets, end of year	376.7	324.5	314.7
Funded Status at End of Year
Funded status, end of year	(112.8)	(91.5)
Amounts Recognized
Noncurrent assets	36.8	30.4
Current liabilities	(0.4)	(0.8)
Noncurrent liabilities	(149.2)	(121.1)
Net amount recognized	(112.8)	(91.5)
Retiree Health Care Plan
Change in Benefit Obligation
Benefit obligation, beginning of year	15.6	16.4
Interest cost	0.6	0.7	0.7
Actuarial (gain) loss	(0.3)	0.2
Benefits paid	(1)	(1.7)
Benefit obligation, end of year	14.9	15.6	$ 16.4
Change in Plan Assets
Benefits paid	(1)	(1.7)
Funded Status at End of Year
Funded status, end of year	(14.9)	(15.6)
Amounts Recognized
Current liabilities	(1.2)	(1.3)
Noncurrent liabilities	(13.7)	(14.3)
Net amount recognized	$ (14.9)	$ (15.6)

Retirement and Deferred Compe83

Retirement and Deferred Compensation Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ 13.9	$ 13
Prior service cost	0	0
Total	13.9	13
Non-United States Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss	29.9	32.7
Prior service cost	6.7	4.7
Total	$ 36.6	$ 37.4

Retirement and Deferred Compe84

Retirement and Deferred Compensation Plans - Narratives (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)insurance_contract	Dec. 31, 2016USD ($)	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Number of foreign plans using guaranteed insurance contracts | insurance_contract	4
Health care cost trend rate assumed for next fiscal year (as a percent)	7.80%
Ultimate health care cost trend rate (as a percent)	5.80%
Year that health care cost trend rate reaches ultimate trend rate	2,022
Estimated employer contribution to pension plans during next fiscal year	$ 4
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for plans that have plan assets	433	$ 377
Accumulated benefit obligation for plans that do not have plan assets	86.7	74.3
Estimated net loss that will be amortized from AOCI into net periodic benefit cost during next fiscal year	0.8
Estimated prior service cost (credit) that will be amortized from AOCI into net periodic benefit cost during next fiscal year	0.6
Retiree Health Care Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service cost (credit) that will be amortized from AOCI into net periodic benefit cost during next fiscal year	(0.8)
Net loss recognized in Accumulated Other Comprehensive Loss	1.4	1.7
Prior service credit recognized in Accumulated Other Comprehensive Loss	$ (4.8)	$ (5.4)
Discount rate used in measurement of benefit obligation (as a percent)	3.50%	4.00%
Discount rate used in measurement of net periodic benefit cost (as a percent)	4.00%	4.30%	3.90%
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss recognized in Accumulated Other Comprehensive Loss	$ 13.9	$ 13
Prior service credit recognized in Accumulated Other Comprehensive Loss	$ 0	$ 0
Discount rate used in measurement of benefit obligation (as a percent)	3.60%	4.00%
Non-United States Plans
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return, non-U.S., lowest (as a percent)	1.30%
Expected long-term rate of return, non-U.S., highest (as a percent)	4.00%
Net loss recognized in Accumulated Other Comprehensive Loss	$ 29.9	$ 32.7
Prior service credit recognized in Accumulated Other Comprehensive Loss	$ 6.7	$ 4.7
Discount rate used in measurement of benefit obligation (as a percent)	2.10%	2.20%

Retirement and Deferred Compe85

Retirement and Deferred Compensation Plans - Plans with Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Accumulated benefit obligation	$ 135.9	$ 107.9
Plan assets	$ 65.5	$ 47.9

Retirement and Deferred Compe86

Retirement and Deferred Compensation Plans - Plans with Projected Benefit Obligation in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Projected benefit obligation	$ 143.8	$ 113.9
Plan assets	$ 65.5	$ 47.9

Retirement and Deferred Compe87

Retirement and Deferred Compensation Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension plans
Net Periodic Benefit Cost
Service cost	$ 10.1	$ 8	$ 7.2
Interest cost	10.6	11.8	12.7
Expected return on assets	(10.8)	(10.9)	(12.9)
Curtailment and settlement	0	(6.9)	0
Net loss	0.9	1	4
Prior service cost (credit)	0.4	0.4	0.4
Net periodic benefit cost	11.2	3.4	11.4
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss
Net (gain) loss	(1.5)	24.7	(22.9)
Prior service cost	2.9	0	0
Amortization of net loss	(0.9)	(1)	(4)
Amortization of prior service (cost) credit	(0.4)	(0.4)	(0.4)
Total recognized in other comprehensive loss	0.1	23.3	(27.3)
Total recognized in net periodic benefit cost and other comprehensive income/loss	11.3	26.7	(15.9)
Retiree Health Care Plan
Net Periodic Benefit Cost
Interest cost	0.6	0.7	0.7
Net loss	0.1	0.1	0.1
Prior service cost (credit)	(0.8)	(0.8)	(0.8)
Net periodic benefit cost	(0.1)	0	0
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss
Net (gain) loss	(0.3)	0.2	(0.5)
Amortization of net loss	(0.1)	(0.1)	(0.1)
Amortization of prior service (cost) credit	0.8	0.8	0.8
Total recognized in other comprehensive loss	0.4	0.9	0.2
Total recognized in net periodic benefit cost and other comprehensive income/loss	$ 0.3	$ 0.9	$ 0.2

Retirement and Deferred Compe88

Retirement and Deferred Compensation Plans - Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States Plans
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.60%	4.00%
Rate of compensation increase	3.00%	3.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate - service cost	4.10%	4.40%	3.90%
Discount rate - interest cost	3.30%	3.40%	3.90%
Expected long-term return on plan assets (as a percent)	4.80%	5.30%	5.50%
Rate of compensation increase	3.00%	3.00%	3.00%
Non-United States Plans
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.10%	2.20%
Rate of compensation increase	1.90%	1.70%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate - service cost	2.20%	3.20%	2.90%
Discount rate - interest cost	2.20%	3.20%	2.90%
Expected long-term return on plan assets (as a percent)	2.80%	3.40%	3.20%
Rate of compensation increase	1.70%	2.20%	2.60%

Retirement and Deferred Compe89

Retirement and Deferred Compensation Plans - Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 38.7	$ 37.3	$ 37.2
United States Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.3	12.1
United States Plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26.4	25.2
United States Plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | United States companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.3	12.1
United States Plans | United States companies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.3	12.1
United States Plans | United States companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | United States companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | International companies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | International companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | International companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.2	14.7
United States Plans | Government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Government bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.2	14.7
United States Plans | Government bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	10.3
United States Plans | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	10.3
United States Plans | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Guaranteed insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Guaranteed insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Guaranteed insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Guaranteed insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Annuity contract | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Annuity contract | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Annuity contract | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Unitized funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Unitized funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Unitized funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Unitized funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Real estate funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Real estate funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Real estate funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Common contractual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
United States Plans | Common contractual funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
United States Plans | Common contractual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
United States Plans | Common contractual funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
United States Plans | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States Plans | Insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	376.7	324.5	$ 314.7
Non-United States Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81.8	50
Non-United States Plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	186.1	148.3
Non-United States Plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108.8	126.2
Non-United States Plans | United States companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.2	0
Non-United States Plans | United States companies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.2	0
Non-United States Plans | United States companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | United States companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35.7	17.7
Non-United States Plans | International companies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35.7	17.7
Non-United States Plans | International companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | International companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45.2	27.5
Non-United States Plans | Government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Government bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45.2	27.5
Non-United States Plans | Government bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59.8	49.6
Non-United States Plans | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59.8	49.6
Non-United States Plans | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Guaranteed insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17.6	14.2
Non-United States Plans | Guaranteed insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Guaranteed insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17.6	14.2
Non-United States Plans | Guaranteed insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55.3	49.5
Non-United States Plans | Annuity contract | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Annuity contract | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55.3	49.5
Non-United States Plans | Annuity contract | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Unitized funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 25.8	$ 23.1
Non-United States Plans | Unitized funds | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of investment in plan assets	60.00%	60.00%
Non-United States Plans | Unitized funds | Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Percentage of investment in plan assets	30.00%	30.00%
Non-United States Plans | Unitized funds | Cash
Defined Benefit Plan Disclosure [Line Items]
Percentage of investment in plan assets	10.00%	10.00%
Non-United States Plans | Unitized funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 25.8	$ 23.1
Non-United States Plans | Unitized funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Unitized funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.2	7
Non-United States Plans | Real estate funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Real estate funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.2	7
Non-United States Plans | Real estate funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Common contractual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		25.9
Non-United States Plans | Common contractual funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-United States Plans | Common contractual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-United States Plans | Common contractual funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		25.9
Non-United States Plans | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108.8	100.3
Non-United States Plans | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-United States Plans | Insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108.8	100.3
Cash and cash equivalents | United States Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	0.2
Cash and cash equivalents | United States Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents | United States Plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	0.2
Cash and cash equivalents | United States Plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents | Non-United States Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.1	9.7
Cash and cash equivalents | Non-United States Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.1	9.2
Cash and cash equivalents | Non-United States Plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0.5
Cash and cash equivalents | Non-United States Plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

Retirement and Deferred Compe90

Retirement and Deferred Compensation Plans - Changes in Fair Value of Pension Assets Measured Using Level 3 Inputs (Details) - Common contractual funds and insurance contracts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Change in Plan Assets
Fair value of plan assets, beginning of year	$ 126.2	$ 92
Transfers	(25.4)	27.3
Actual return on plan assets	(5.3)	13.9
Purchases, sales and settlements, net	(0.6)	(2.1)
Currency exchange rate changes	13.9	(4.9)
Fair value of plan assets, end of year	$ 108.8	$ 126.2

Retirement and Deferred Compe91

Retirement and Deferred Compensation Plans - Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Compensation and Retirement Disclosure [Abstract]
Effect of 1% increase on total of service and interest cost components	$ 0
Effect of 1% decrease on total of service and interest cost components	0
Effect of 1% increase on benefit obligation	0.2
Effect of 1% decrease on benefit obligation	$ (0.2)

Retirement and Deferred Compe92

Retirement and Deferred Compensation Plans - Projected Benefit Payment Estimates (Details) $ in Millions	Dec. 31, 2017USD ($)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 14
2,019	14.3
2,020	15.8
2,021	17.9
2,022	19.6
2023-2027	127.8
Total projected benefit payments	209.4
Retiree Health Care Plan
Defined Benefit Plan Disclosure [Line Items]
2,018	1.2
2,019	1.2
2,020	1.1
2,021	1.1
2,022	1.1
2023-2027	5
Total projected benefit payments	$ 10.7

Retirement and Deferred Compe93

Retirement and Deferred Compensation Plans - Defined Contribution Plans and Deferred Compensation Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation plans, asset and liability	$ 98	$ 85.7
Other Pension Plan, Postretirement or Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded status, end of year	(61.8)	(56.8)
Non-United States Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax	(29.9)	(32.7)
Funded status, end of year	(112.8)	(91.5)
Statutory Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expense	35.6	24	$ 24.7
Company Sponsored Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expense	$ 17.6	$ 21.4	$ 19.6

Accumulated Other Comprehensi94

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation	$ (87.7)	$ (289.1)
Translation (loss) gain on net investment hedge, net of income taxes of $(23.1) and $11.2, respectively	(39.9)	24.8
Translation gain (loss) on net investment hedge, taxes	(23.1)	11.2
Translation loss on long-term intercompany loans	(128.8)	(133.7)
Unrealized gain on investments, net of income taxes of $3.4 and $4.2, respectively	15.3	18.6
Unrealized gain on investments, taxes	3.4	4.2
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss	(288.2)	(426.1)
Defined benefit pension plans, net of income taxes of $(27.8) for both 2017 and 2016
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans	(50.5)	(50.4)
Defined benefit plans, taxes	(27.8)	(27.8)
Retiree health care plan, net of income taxes of $2.0 and $2.1, respectively
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans	3.4	3.7
Defined benefit plans, taxes	$ 2	$ 2.1

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Future minimum lease payments under noncancelable operating leases [Abstract]
2,018	$ 167.3
2,019	123
2,020	93.6
2,021	69
2,022	54
Thereafter	125.1
Total minimum lease payments	632
Rental expense [Abstract]
Rental expense for all operating leases	$ 173.1	$ 166.5	$ 174.9

Interest and Other Expenses (De

Interest and Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Nonoperating Income (Expense) [Abstract]
Interest expense	$ 38.2	$ 37.9	$ 36
Interest income	(4.8)	(3.6)	(2.5)
Foreign exchange loss (gain)	0.8	2.8	(4.7)
Miscellaneous expense (income), net	16.7	12.4	(0.6)
Interest and other expenses	$ 50.9	$ 49.5	$ 28.2

Derivative Financial Instrume97

Derivative Financial Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017EUR (€)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 898.4	$ 785.9
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(39.9)	24.8
Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(35.7)	29
Designated as economic hedges | Forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized translation (loss) gain on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes	(4.2)	(4.2)
Not designated as hedges | Forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loss associated with forward contracts included in interest and other expenses		1.6
Gain associated with forward contracts included in interest and other expenses	0		$ 0.6
€400 due September 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	477.8	417.7
€400 due September 2022 | Designated as economic hedges | Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount	477.8			€ 400,000,000
€350 due June 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	420	$ 367.5
€350 due June 2018 | Designated as economic hedges | Euro-denominated notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount	$ 420			€ 350,000,000

Contingencies (Details)

Contingencies (Details) € in Millions	Apr. 26, 2017USD ($)	Apr. 26, 2017EUR (€)	Dec. 31, 2014USD ($)	Dec. 31, 2017USD ($)
Guarantees
Loss Contingencies [Line Items]
Loss contingency				$ 149,300,000
Stand-by letters of credit
Loss Contingencies [Line Items]
Loss contingency				52,600,000
Guarantee contracts and stand-by letters of credit
Loss Contingencies [Line Items]
Loss contingency				201,900,000
7S
Loss Contingencies [Line Items]
Additional consideration sought from the seller of 7S	$ 25,000,000	€ 20.8
Loss contingency				$ 0
2014 California lawsuit
Loss Contingencies [Line Items]
Legal costs			$ 9,000,000

Segment Data - Segment Informat

Segment Data - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services	$ 5,637.5	$ 5,464.8	$ 5,174.8	$ 4,757.2	$ 4,956.1	$ 5,088.2	$ 5,022.1	$ 4,587.7	$ 21,034.3	$ 19,654.1	$ 19,329.9
Operating Unit Profit									931.2	879.6	832.7
Intangible asset amortization expense									(34.6)	(36)	(32.8)
Interest and other expenses									(50.9)	(49.5)	(28.2)
Earnings before income taxes									737.3	701.3	660.7
Franchise fees									23.7	23.3	24.2
Depreciation and Amortization Expense									84.4	85.3	77.7
Earnings from Equity Investments									15	3.6	8
Total Assets	8,883.6				7,574.2				8,883.6	7,574.2	7,517.5
Equity Investments	158.7				145.8				158.7	145.8	137.9
Long-Lived Assets	161.3				150.6				161.3	150.6	152.2
Reportable segments | Americas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									4,216.4	4,297.2	4,492
Operating Unit Profit									213.7	196.5	200.8
Depreciation and Amortization Expense									11.8	12.6	12.2
Earnings from Equity Investments									0	0	0
Total Assets	2,110.6				2,033.3				2,110.6	2,033.3	2,013.4
Equity Investments	0				0				0	0	0
Long-Lived Assets	26.7				34				26.7	34	33.3
Reportable segments | Americas | United States | Reportable subsegments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									2,659	2,836.8	3,005.8
Operating Unit Profit									152.5	142.9	143.8
Franchise fees									14.8	15.1	15.2
Depreciation and Amortization Expense									9.3	9.9	9.3
Earnings from Equity Investments									0	0	0
Total Assets	1,781.4				1,718.9				1,781.4	1,718.9	1,708.5
Equity Investments	0				0				0	0	0
Long-Lived Assets	20.6				27.7				20.6	27.7	26
Reportable segments | Americas | Other Americas | Reportable subsegments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									1,557.4	1,460.4	1,486.2
Operating Unit Profit									61.2	53.6	57
Depreciation and Amortization Expense									2.5	2.7	2.9
Earnings from Equity Investments									0	0	0
Total Assets	329.2				314.4				329.2	314.4	304.9
Equity Investments	0				0				0	0	0
Long-Lived Assets	6.1				6.3				6.1	6.3	7.3
Reportable segments | Southern Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									8,657	7,497.6	7,291.5
Operating Unit Profit									441.9	376.9	369.6
Depreciation and Amortization Expense									18.8	16.4	15.2
Earnings from Equity Investments									15	3.6	7.9
Total Assets	3,786				2,889.8				3,786	2,889.8	2,678.1
Equity Investments	157.6				139.7				157.6	139.7	136.5
Long-Lived Assets	77.1				62.4				77.1	62.4	58.1
Reportable segments | Southern Europe | France | Reportable subsegments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									5,477.2	4,837.4	4,661.3
Operating Unit Profit									278	250.6	258.8
Depreciation and Amortization Expense									12.3	11	10.1
Earnings from Equity Investments									0	0	0.4
Total Assets	2,753.1				2,104.8				2,753.1	2,104.8	1,926.3
Equity Investments	0				0.2				0	0.2	0
Long-Lived Assets	47.9				39.7				47.9	39.7	39.2
Reportable segments | Southern Europe | Italy | Reportable subsegments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									1,475.9	1,167.7	1,226.1
Operating Unit Profit									104.5	79.1	70.9
Depreciation and Amortization Expense									1.8	1.9	1.9
Earnings from Equity Investments									0	0	0
Total Assets	436.7				294.9				436.7	294.9	267.1
Equity Investments	0.4				0.4				0.4	0.4	0.2
Long-Lived Assets	4.9				4.4				4.9	4.4	4.7
Reportable segments | Southern Europe | Other Southern Europe | Reportable subsegments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									1,703.9	1,492.5	1,404.1
Operating Unit Profit									59.4	47.2	39.9
Depreciation and Amortization Expense									4.7	3.5	3.2
Earnings from Equity Investments									15	3.6	7.5
Total Assets	596.2				490.1				596.2	490.1	484.7
Equity Investments	157.2				139.1				157.2	139.1	136.3
Long-Lived Assets	24.3				18.3				24.3	18.3	14.2
Reportable segments | Northern Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									5,306.4	5,129.1	5,033.7
Operating Unit Profit									140.7	173	144.7
Depreciation and Amortization Expense									10.6	10.9	8.9
Earnings from Equity Investments									0	0	0.1
Total Assets	1,569				1,292.4				1,569	1,292.4	1,197.7
Equity Investments	0				0.1				0	0.1	1.4
Long-Lived Assets	28				25.4				28	25.4	30.5
Reportable segments | APME
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									2,636.4	2,471.3	2,239.1
Operating Unit Profit									98.9	88.5	79.3
Depreciation and Amortization Expense									4.7	5.3	4.7
Earnings from Equity Investments									0	0	0
Total Assets	780.7				612.8				780.7	612.8	533.6
Equity Investments	0.1				0				0.1	0	0
Long-Lived Assets	21.4				17.9				21.4	17.9	19.4
Reportable segments | Right Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues from Services									218.1	258.9	273.6
Operating Unit Profit									36	44.7	38.3
Depreciation and Amortization Expense									3.7	3.9	3.7
Earnings from Equity Investments									0	0	0
Total Assets	138.1				136.6				138.1	136.6	143.9
Equity Investments	0				0				0	0	0
Long-Lived Assets	8				10.7				8	10.7	10.5
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate expenses									(108.4)	(92.8)	(111)
Depreciation and Amortization Expense									0.2	0.2	0.2
Total Assets	499.2				609.3				499.2	609.3	950.8
Equity Investments	1				6				1	6	0
Long-Lived Assets	$ 0.1				$ 0.2				0.1	0.2	0.4
Additions to Long-Lived Assets									0	0	0.4
Segment reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intangible asset amortization expense									(34.6)	(36)	(32.8)
Interest and other expenses									(50.9)	(49.5)	(28.2)
Additions to Long-Lived Assets									53.9	54.6	52.3
Segment reconciling items | Americas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									9.1	13.8	12.5
Segment reconciling items | Americas | United States
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									6.7	11.9	10.1
Segment reconciling items | Americas | Other Americas
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									2.4	1.9	2.4
Segment reconciling items | Southern Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									25.7	23.9	18.1
Segment reconciling items | Southern Europe | France
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									15.2	13.3	10.3
Segment reconciling items | Southern Europe | Italy
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									1.7	1.7	2.4
Segment reconciling items | Southern Europe | Other Southern Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									8.8	8.9	5.4
Segment reconciling items | Northern Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									11.8	8.5	12.1
Segment reconciling items | APME
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									6.3	3.9	4.5
Segment reconciling items | Right Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Additions to Long-Lived Assets									$ 1	$ 4.5	$ 4.7

Segment Data - Segment Infor100

Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services	$ 5,637.5	$ 5,464.8	$ 5,174.8	$ 4,757.2	$ 4,956.1	$ 5,088.2	$ 5,022.1	$ 4,587.7	$ 21,034.3	$ 19,654.1	$ 19,329.9
Long-Lived Assets	161.3				150.6				161.3	150.6	152.2
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									2,758.5	2,950.2	3,115.6
Long-Lived Assets	24.9				33.9				24.9	33.9	32.3
France
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									5,493.9	4,857.3	4,684.1
Long-Lived Assets	49.1				40.9				49.1	40.9	40.4
Italy
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,479.4	1,170.7	1,230.2
Long-Lived Assets	4.9				4.4				4.9	4.4	4.7
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									1,619.2	1,819.7	2,118.4
Long-Lived Assets	9.1				9				9.1	9	10.3
Total Foreign
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues from Services									18,275.8	16,703.9	16,214.3
Long-Lived Assets	$ 136.4				$ 116.7				$ 136.4	$ 116.7	$ 119.9

Quarterly Data (Unaudited) (Det

Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues from services	$ 5,637.5	$ 5,464.8	$ 5,174.8	$ 4,757.2	$ 4,956.1	$ 5,088.2	$ 5,022.1	$ 4,587.7	$ 21,034.3	$ 19,654.1	$ 19,329.9
Gross profit	934.5	900.6	861.7	787.8	841	858.3	860.7	773.8	3,484.6	3,333.8	3,295.8
Operating profit	238.7	227.9	194.6	127	212	211.1	196	131.7	788.2	750.8	688.9
Net earnings	$ 216.3	$ 137.7	$ 117	$ 74.4	$ 127.4	$ 129.2	$ 115.4	$ 71.7	$ 545.4	$ 443.7	$ 419.2
Net earnings per share - basic (in dollars per share)	$ 3.26	$ 2.06	$ 1.74	$ 1.10	$ 1.89	$ 1.89	$ 1.61	$ 0.98	$ 8.13	$ 6.33	$ 5.46
Net earnings per share - diluted (in dollars per share)	3.22	2.04	1.72	1.09	1.87	1.87	1.60	0.98	8.04	6.27	5.40
Dividends per share (in dollars per share)	$ 0.93	$ 0	$ 0.93	$ 0	$ 0.86	$ 0	$ 0.86	$ 0	$ 1.86	$ 1.72	$ 1.60
Restructuring costs			$ 10.5	$ 24
Net tax benefits related to the Tax Act and French tax reform	$ 73.7								$ 73.7	$ 0	$ 0
Restructuring costs per diluted share (in dollars per share)			$ (0.10)	$ (0.30)
Net tax benefits per diluted share (in dollars per share)	$ 1.10

Schedule II VALUATION AND QU102

Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 98.2	$ 98.1	$ 111.4
Provisions charged to earnings	18.1	20.4	16.3
Write-offs	(17.6)	(16.9)	(20.3)
Translation adjustments	12.4	(3.2)	(10.1)
Reclassifications and other, deductions	(0.3)	(0.2)
Reclassifications and other, additions			0.8
Balance at end of year	$ 110.8	$ 98.2	$ 98.1