Verisk Analytics (VRSK) 10-Q 31 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	VRSK
Entity Registrant Name	Verisk Analytics, Inc.
Entity Central Index Key	1,442,145
Current Fiscal Year End Data	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		164,708,411

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 132	$ 142.3
Available-for-sale securities	3.8	3.8
Accounts receivable, net of allowance for doubtful accounts of $5.2 and $4.6, respectively	347.8	345.5
Prepaid expenses	61.1	38.1
Income taxes receivable	22.4	28.8
Other current assets	58	39.1
Total current assets	625.1	597.6
Noncurrent assets:
Fixed assets, net	501.9	478.3
Intangible assets, net	1,289.5	1,345.3
Goodwill, net	3,372.7	3,368.7
Deferred income tax assets	15.7	15.9
Other assets	234.7	214.5
Total assets	6,039.6	6,020.3
Current liabilities:
Accounts payable and accrued liabilities	216.4	225.4
Short-term debt and current portion of long-term debt	736.9	724.4
Deferred revenues	513	384.7
Income taxes payable	0	3.1
Total current liabilities	1,466.3	1,337.6
Noncurrent liabilities:
Long-term debt	2,044.2	2,284.4
Deferred income tax liabilities	349.6	337.8
Other liabilities	105.9	135.1
Total liabilities	3,966	4,094.9
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value per share; 2,000,000,000 shares authorized; 544,003,038 shares issued and 164,724,043 and 164,878,930 shares outstanding, respectively	0.1	0.1
Additional paid-in capital	2,235	2,180.1
Treasury stock, at cost, 379,278,995 and 379,124,108 shares, respectively	(3,317.7)	(3,150.5)
Retained earnings	3,630.4	3,308
Accumulated other comprehensive losses	(474.2)	(412.3)
Total stockholders’ equity	2,073.6	1,925.4
Total liabilities and stockholders’ equity	$ 6,039.6	$ 6,020.3

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 5.2	$ 4.6
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, issued (in shares)	544,003,038	544,003,038
Common stock, outstanding (in shares)	164,724,043	164,878,930
Treasury stock (in shares)	379,278,995	379,124,108

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 601.3	$ 523.2	$ 1,182.5	$ 1,025.8
Expenses:
Cost of revenues (exclusive of items shown separately below)	222.4	193.7	443.6	376.6
Selling, general and administrative	93	78.8	184.9	154.7
Depreciation and amortization of fixed assets	41.6	31.8	82	65.6
Amortization of intangible assets	32	23.9	65.2	46.2
Total expenses	389	328.2	775.7	643.1
Operating income	212.3	195	406.8	382.7
Other income (expense):
Investment income and others, net	4.6	3.4	5.3	5.3
Interest expense	(31.9)	(28.5)	(64.8)	(56.9)
Total other expense, net	(27.3)	(25.1)	(59.5)	(51.6)
Income before income taxes	185	169.9	347.3	331.1
Provision for income taxes	(31.5)	(48.9)	(60.8)	(101.3)
Net income	$ 153.5	$ 121	$ 286.5	$ 229.8
Net income per share
Basic (USD per shares)	$ 0.93	$ 0.73	$ 1.74	$ 1.39
Diluted (USD per shares)	$ 0.91	$ 0.72	$ 1.70	$ 1.36
Weighted average shares outstanding:
Basic (in shares)	165,015,642	164,922,237	165,029,345	165,682,614
Diluted (in shares)	168,651,202	168,314,296	168,821,869	169,232,579

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 153.5	$ 121	$ 286.5	$ 229.8
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(165.6)	89.6	(62.9)	122.7
Available-for-sale securities adjustment	0	0.1	0	0.2
Pension and postretirement liability adjustment	0.7	0.8	1.7	1.5
Total other comprehensive (loss) income	(164.9)	90.5	(61.2)	124.4
Comprehensive (loss) income	$ (11.4)	$ 211.5	$ 225.3	$ 354.2

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Par Value	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Losses	Common Stock Issued
Beginning balance (in shares) at Dec. 31, 2016							544,003,038
Beginning balance at Dec. 31, 2016	$ 1,332.4	$ 0.1	$ 2,121.6	$ (2,891.4)	$ 2,752.9	$ (650.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	555.1				555.1
Other comprehensive income	238.5					238.5
Treasury stock acquired	(269.8)			(269.8)
Stock options exercised	37.9		28.7	9.2
Restricted stock lapsed			(1.1)	1.1
Employee stock purchase plan	2.4		2.2	0.2
Stock-based compensation	31.8		31.8
Net share settlement from restricted stock awards	$ (2.9)		(2.9)
Other stock issuances			(0.2)	0.2
Ending balance (in shares) at Dec. 31, 2017	544,003,038						544,003,038
Ending balance at Dec. 31, 2017	$ 1,925.4	0.1	2,180.1	(3,150.5)	3,308	(412.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to opening retained earnings related to Topic 606 and ASU 2016-01 | Accounting Standards Update 2016-01	35.2				35.9	(0.7)
Net income	286.5
Other comprehensive income	(61.2)					(61.2)
Treasury stock acquired	(180.4)			(180.4)
Stock options exercised	50.3		38.7	11.6
Restricted stock lapsed			(1.4)	1.4
Employee stock purchase plan	1.5		1.4	0.1
Stock-based compensation	19.8		19.8
Net share settlement from restricted stock awards	$ (3.5)		(3.5)
Other stock issuances			(0.1)	0.1
Ending balance (in shares) at Jun. 30, 2018	544,003,038						544,003,038
Ending balance at Jun. 30, 2018	$ 2,073.6	$ 0.1	$ 2,235	$ (3,317.7)	$ 3,630.4	$ (474.2)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Treasury stock, shares acquired (in shares)	1,711,166	3,356,360
Shares reissued from treasury stock (in shares)	1,369,268	1,125,004
Other stock issuances (in shares)	5,160	21,352
Restricted stock
Shares reissued from treasury stock (in shares)	167,072	143,557
Shares withheld from settlement (in shares)	33,499	36,067
Employee stock purchase plan
Shares reissued from treasury stock (in shares)	14,779	29,605

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 286.5	$ 229.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of fixed assets	82	65.6
Amortization of intangible assets	65.2	46.2
Amortization of debt issuance costs and original issue discount	2.1	2.1
Provision for doubtful accounts	2.8	0.8
Stock-based compensation	19.8	15.4
Realized gain on available-for-sale securities, net	0.1	0
Deferred income taxes	(1.1)	(0.1)
Loss on disposal of fixed assets, net	(0.1)	0
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(2.8)	6.3
Prepaid expenses and other assets	(20)	(18.2)
Income taxes	3.2	(3.3)
Accounts payable and accrued liabilities	1.8	(16.6)
Deferred revenues	123.8	111
Other liabilities	(29.1)	(9.2)
Net cash provided by operating activities	534.2	429.8
Cash flows from investing activities:
Acquisitions, net of cash acquired of $3.1 and $4.0, respectively	(61.4)	(109.8)
Escrow funding associated with acquisitions	(6.3)	(12.5)
Capital expenditures	(99.3)	(72.5)
Purchases of available-for-sale securities	(0.1)	(0.2)
Proceeds from sales and maturities of available-for-sale securities	0.2	0.3
Other investing activities, net	3.1	0
Net cash used in investing activities	(170)	(194.7)
Cash flows from financing activities:
(Repayments) proceeds of short-term debt, net	(235)	20
Payment of debt issuance costs	0	(0.5)
Repurchases of common stock	(179.4)	(266.1)
Proceeds from stock options exercised	47	22.4
Net share settlement from restricted stock awards	(3.5)	(2.9)
Other financing activities, net	(6.2)	(5.7)
Net cash used in financing activities	(377.1)	(232.8)
Effect of exchange rate changes	2.6	3.3
(Decrease) increase in cash and cash equivalents	(10.3)	5.6
Cash and cash equivalents, beginning of period	142.3	135.1
Cash and cash equivalents, end of period	132	140.7
Supplemental disclosures:
Income taxes paid	58	105.7
Interest paid	63.9	54.7
Non-cash investing and financing activities:
Repurchases of common stock included in accounts payable and accrued liabilities	1	0
Deferred tax liability established on date of acquisition	5.1	8
Capital lease obligations	11.4	0.5
Fixed assets included in accounts payable and accrued liabilities	$ 0.9	$ 2.3

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Cash acquired from acquisition	$ 3.1	$ 4

Organization

Organization	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Organization	Organization: Verisk Analytics, Inc. and its consolidated subsidiaries (“Verisk” or the “Company”) is a data analytics provider serving customers in insurance, energy and specialized markets, and financial services. Using various technologies to collect and analyze billions of records, Verisk draws on numerous data assets and domain expertise to provide first-to-market innovations that are integrated into customer workflows. Verisk offers predictive analytics and decision support solutions to customers in rating, underwriting, claims, catastrophe and weather risk, global risk analytics, natural resources intelligence, economic forecasting, and many other fields. Around the world, Verisk helps customers protect people, property, and financial assets. Verisk was established to serve as the parent holding company of Insurance Services Office, Inc. (“ISO”) upon completion of the initial public offering (“IPO”), which occurred on October 9, 2009. ISO was formed in 1971 as an advisory and rating organization for the property and casualty ("P&C") insurance industry to provide statistical and actuarial services, to develop insurance programs and to assist insurance companies in meeting state regulatory requirements. For over the past decade, the Company broadened its data assets, entered new markets, placed a greater emphasis on analytics, and pursued strategic acquisitions. Verisk trades under the ticker symbol “VRSK” on the Nasdaq Global Select Market.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies: The accompanying unaudited condensed consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the U.S. (“U.S. GAAP”). The preparation of financial statements in conformity with these accounting principles requires management 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 during the reporting periods. Significant estimates include acquisition purchase price allocations, the fair value of goodwill, the realization of deferred tax assets and liabilities, acquisition related liabilities, fair value of stock-based compensation for stock options granted, and assets and liabilities for pension and postretirement benefits. Actual results may ultimately differ from those estimates. The condensed consolidated financial statements as of June 30, 2018 and for the three and six months ended June 30, 2018 and 2017 , in the opinion of management, include all adjustments, consisting of normal recurring items, to present fairly the Company’s financial position, results of operations and cash flows. The operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results to be expected for the full year. Other than adopting Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (“Topic 606”) and ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU No. 2016-01”) as of January 1, 2018, the condensed consolidated financial statements and related notes for the three and six months ended June 30, 2018 have been prepared on the same basis as and should be read in conjunction with the annual report on Form 10-K for the year ended December 31, 2017 . Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules of the Securities and Exchange Commission (“SEC”). The Company believes the disclosures made are adequate to keep the information presented from being misleading. Effective for the first quarter of 2018, the operating segments of the Company are Insurance, Energy and Specialized Markets, and Financial Services. Previously, its operating segments were Decision Analytics and Risk Assessment. (See Note 13). (a) Revenue Recognition The following describes the Company’s primary types of revenues and the applicable revenue recognition policies. The Company’s revenues are primarily derived from the sales of services and revenue is recognized when control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for those services. Revenue is recognized net of applicable sales tax withholdings. The Company recognizes revenues through subscriptions, long-term agreements and on a transactional basis, recurring and nonrecurring. Subscriptions for the solutions are generally paid in advance of rendering services either quarterly or in full upon commencement of the subscription period, which is usually for one year and automatically renewed each year. The long-term agreements are generally for periods of three to five years. The Company recognizes revenue from subscriptions ratably over the term of the subscription and most long-term agreements are recognized ratably over the term of the agreement. As the Company offers most of its solutions through a hosting environment, revenue on the majority of the contracts is recognized over time because of the customer's continuous right to use the solutions as soon as access is provided. In addition, the Company performs certain discrete project based consulting services which are recognized over time by measuring the progress toward complete satisfaction of the performance obligation, based on the input method of consulting hours worked; this aligns with the results achieved and value transferred to the customer. The hours consumed are best reflective of the measure of progress towards satisfying the performance obligation, as the resources hours worked directly tie to the progress of the services to be provided. Certain solutions are also paid for by customers on a transactional basis. The Company recognizes these revenues as the solutions are delivered or services performed. In general, they are billed monthly at the end of each month. Insurance Revenue Industry-standard insurance programs, statistical agent and data services and actuarial services are sold to participating insurance company customers under annual agreements covering a calendar year where the price is determined at the inception of the agreement. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. In accordance with Topic 606, the Company recognizes revenue ratably over the term of these annual agreements under the series guidance, as services are performed and continuous access to information is provided over the entire term of the agreements. Also within the Insurance segment, the Company licenses hosting solutions that provide continuous access to information in the areas of fraud detection, catastrophe modeling, loss estimation, and underwriting. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. The Company recognizes revenue ratably over the term of these annual agreements under the series guidance, as services are performed and continuous access to information is provided over the entire term of the agreements. There are also services within insurance, which are comprised of transaction-based fees for which revenue is recognized as information is delivered to customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for those services. Energy and Specialized Markets Revenue The Company licenses hosting solutions that provide continuous access to research information such as data analytics and commercial intelligence for the energy, chemicals, metals and mining verticals. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. The Company recognizes revenue ratably over the term of these annual agreements. Furthermore, the Company performs certain discrete project based services; in these instances, revenue is recognized as control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for these services. Financial Services Revenue Financial services provide competitive benchmarking, scoring solutions, analytics, and customized service to financial services institutions. The Company primarily recognizes revenue ratably for these services over the term of the agreements, as services are performed and continuous service is provided over the entire term of the agreements. In addition, the Company performs certain discrete project based services that are unrelated and independent of the aforementioned continuous services; in these instances, revenue is recognized as control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for these services. Practical Expedient and Exemption The Company generally recognizes revenues, provided that all other revenue recognition criteria are met, and related costs when incurred in accordance with Topic 606 because the period of recognition would have been one year or less. These costs are recorded within “Cost of revenues” and “Selling, general and administrative” expenses in the condensed consolidated statements of operations. Accounts Receivables and Allowance for Doubtful Accounts Accounts receivables is generally recorded at the invoiced amount. The allowance for doubtful accounts is estimated based on an analysis of the aging of the accounts receivable, historical write-offs, customer payment patterns, individual customer credit worthiness, current economic trends, and/or establishment of specific reserves for customers in adverse financial condition. The Company assesses the adequacy of the allowance for doubtful accounts on a quarterly basis. Deferred Commissions The incremental costs of obtaining a contract with a customer, which primarily consists of sales commissions, are deferred and amortized over a useful life of 5 years that is consistent with the transfer to the customer the services to which the asset relates. The Company classifies deferred commissions as current or noncurrent based on the timing of expense recognition. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other assets, respectively, in the condensed consolidated balance sheets as of June 30, 2018 . Amortization expense related to deferred commissions is computed on a straight-line basis over its estimated useful lives and included in the condensed consolidated statements of operations. Recent Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases ("ASU No. 2016-02"). This ASU amends the existing accounting considerations and treatments for leases through the creation of Topic 842, Leases , to increase transparency and comparability among organizations by requiring the recognition of lease assets and lease liabilities on the balance sheet and the disclosure of key information about lease arrangements. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from such leases. The Company established a corporate implementation team, which engages with cross-functional representatives from all of its business verticals. The Company is utilizing a bottom-up approach to analyze the impact of the standard on its lease contract portfolio by reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to lease arrangements. In addition, the Company is in the process of identifying and/or implementing the appropriate changes to its business processes, systems and controls to support recognition and disclosure under the new standard. The amendments in ASU No. 2016-02 are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and allows for modified retrospective adoption with early adoption permitted. The Company has decided not to early adopt the amendments. The Company is also assessing the impact associated with the adoption of ASU No. 2016-02 on the condensed consolidated balance sheet, which is expected to be material based upon review of the future contractual obligations. In June 2018, the FASB issued an ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting ("ASU No. 2018-07") intended to reduce cost and complexity and to improve financial reporting for share-based payments issued to nonemployees. This ASU expands the scope of Topic 718, Compensation - Stock Compensation ("Topic 718") , to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. Early adoption is permitted. The Company has decided not to early adopt the amendments. The adoption of ASU No. 2018-07 is not expected to have a material impact on the Company's condensed consolidated financial statements.

Revenues

Revenues	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues: In May 2014, the Financial Accounting Standards Board ("FASB") issued Topic 606, which replaces numerous requirements under Topic 605, Revenue Recognition ("Topic 605"), in U.S. GAAP, including industry-specific requirements, and provides companies with a single revenue recognition model for recognizing revenue from contracts with customers. The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Revenue is recognized in a five-step model: 1) identify the contract with a customer; 2) identify the performance obligations in the contract; 3) determine the transaction price; 4) allocate the transaction price to the performance obligations in the contract; and 5) recognize revenue when or as the company satisfies a performance obligation. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. Effective January 1, 2018, the Company adopted the requirements of Topic 606 using the modified retrospective method. The results of operations for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with the historic accounting under Topic 605. The accounting policies related to Topic 605 were presented in the Form 10-K for the year ended December 31, 2017, for which the Company recognized revenue when the following four criteria were met: persuasive evidence of an arrangement existed, delivery had occurred or services had been rendered, fees and/or price was fixed or determinable, and collectability was reasonably assured. The following table shows cumulative effect of the changes made to the January 1, 2018 condensed consolidated balance sheet for the adoption of Topic 606 related to contracts that were entered into prior to and remained in progress subsequent to the adoption: December 31, 2017 Adjustments due to Topic 606 January 1, 2018 Accounts receivable $ 345.5 $ 3.0 (1) $ 348.5 Prepaid expenses $ 38.1 $ 14.9 (2) $ 53.0 Other assets $ 214.5 $ 27.0 (2) $ 241.5 Deferred revenues $ 384.7 $ (1.5 ) $ 383.2 Deferred income tax liabilities $ 337.8 $ 11.2 $ 349.0 Retained earnings $ 3,308.0 $ 35.2 $ 3,343.2 _______________ (1) Relates to unbilled receivables (2) Relates to deferred commissions current and non-current, respectively In accordance with Topic 606, the disclosure of the impact of adoption on the unaudited condensed consolidated statement of operations and the condensed consolidated balance sheet for and as of the three and six months ended June 30, 2018 are as follows: Three months ended June 30, 2018 under Topic 605 Adjustments due to Topic 606 Three months ended June 30, 2018 under Topic 606 Revenues $ 601.3 $ — $ 601.3 Selling, general and administrative $ 94.9 $ (1.9 ) $ 93.0 Provision for income taxes $ (31.0 ) $ (0.5 ) $ (31.5 ) Net income $ 152.1 $ 1.4 $ 153.5 Six months ended June 30, 2018 under Topic 605 Adjustments due to Topic 606 Six months ended June 30, 2018 under Topic 606 Revenues $ 1,182.1 $ 0.4 $ 1,182.5 Selling, general and administrative $ 187.8 $ (2.9 ) $ 184.9 Provision for income taxes $ (60.0 ) $ (0.8 ) $ (60.8 ) Net income $ 284.0 $ 2.5 $ 286.5 As of June 30, 2018 under Topic 605 Adjustments due to Topic 606 As of June 30, 2018 under Topic 606 Accounts receivable $ 343.1 $ 4.7 $ 347.8 Prepaid expenses $ 45.2 $ 15.9 $ 61.1 Other assets $ 204.7 $ 30.0 $ 234.7 Accounts payable and accrued liabilities $ 215.3 $ 1.1 $ 216.4 Deferred revenues $ 513.2 $ (0.2 ) $ 513.0 Deferred income tax liabilities $ 337.6 $ 12.0 $ 349.6 Retained earnings $ 3,592.7 $ 37.7 $ 3,630.4 Disaggregated revenues by type of service and by country are provided below for the three and six months ended June 30, 2018 and 2017 . No individual country outside of the U.S. accounted for 10.0% or more of the Company's consolidated revenues for the three and six months ended June 30, 2018 or 2017 . Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Insurance: Underwriting & rating $ 288.9 $ 262.0 $ 569.6 $ 515.2 Claims 140.5 120.4 272.5 234.1 Total Insurance 429.4 382.4 842.1 749.3 Energy and Specialized Markets 129.9 110.3 255.4 216.6 Financial Services 42.0 30.5 85.0 59.9 Total revenues $ 601.3 $ 523.2 $ 1,182.5 $ 1,025.8 Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Revenues: U.S. $ 460.4 $ 409.0 $ 909.9 $ 805.0 U.K. 36.0 26.1 71.0 49.8 Other countries 104.9 88.1 201.6 171.0 Total revenues $ 601.3 $ 523.2 $ 1,182.5 $ 1,025.8 The Company's remaining performance obligations represent future revenues not yet recorded for services that have not yet been performed. The Company’s most significant remaining performance obligations relate to providing customers with the right to use content over the remaining contract term. Revenues expected to be recognized in the future related to performance obligations, included within our deferred revenue and other liabilities, that are unsatisfied at June 30, 2018 are $515.6 million . Our disclosure of the timing for satisfying the performance obligation is based on the requirements of contracts with customers. However, from time to time, these contracts may be subject to modifications, impacting the timing of satisfying the performance obligations. These performance obligations, which are expected to be satisfied within one year and greater than one year, comprised 98.0% and 2.0% of the balance at June 30, 2018 , respectively.

Contract Assets and Contract Li

Contract Assets and Contract Liabilities	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	Contract Assets and Contract Liabilities Contract assets are defined as an entity's right to consideration in exchange for goods or services that the entity has transferred to a customer when that right is conditioned on something other than the passage of time. As of June 30, 2018 and January 1, 2018 , the Company had no contract assets. As of June 30, 2018 and January 1, 2018 , the Company had contract liabilities of $515.6 million and $386.7 million , respectively. The $128.9 million increase in contract liabilities from January 1, 2018 to June 30, 2018 was primarily due to billings of $376.2 million that were paid in advance, offset by $246.8 million of revenue recognized in the six months ended June 30, 2018 . Contract liabilities are included in "Deferred revenues" and "Other liabilities" in the condensed consolidated balance sheet as of June 30, 2018 and January 1, 2018 .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements: Certain assets and liabilities of the Company are reported at fair value in the accompanying condensed consolidated balance sheets. To increase consistency and comparability of assets and liabilities recorded at fair value, ASC 820-10, Fair Value Measurements (“ASC 820-10”), established a three-level fair value hierarchy to prioritize the inputs to valuation techniques used to measure fair value. ASC 820-10 requires disclosures detailing the extent to which companies measure assets and liabilities at fair value, the methods and assumptions used to measure fair value and the effect of fair value measurements on earnings. In accordance with ASC 820-10, the Company applied the following fair value hierarchy: Level 1 - Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments. Level 2 - Assets and liabilities valued based on observable market data for similar instruments. Level 3 - Assets or liabilities for which significant valuation assumptions are not readily observable in the market; instruments valued based on the best available data, some of which are internally-developed, and considers risk premiums that market participants would require. The fair values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, and short-term debt approximate their carrying amounts because of the short-term nature of these instruments. The following table summarizes fair value measurements by level for registered investment companies that were measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level 1) June 30, 2018 Registered investment companies (1) $ 3.8 December 31, 2017 Registered investment companies (1) $ 3.8 _______________ (1) Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned. The Company has not elected to carry its subordinated promissory note receivable and long-term debt at fair value. The carrying value of the subordinated promissory note receivable represents amortized cost and has been included in "Other assets" in the accompanying condensed consolidated balance sheets. The subordinated promissory note has a face value of $100.0 million and an eight year maturity. The carrying value of the long-term debt represents amortized cost less unamortized discount and debt issuance costs. The Company assesses the fair value of these financial instruments based on an estimate of interest rates available to the Company for financial instruments with similar features, the Company’s current credit rating and spreads applicable to the Company. The following table summarizes the carrying value and estimated fair value of these financial instruments as of June 30, 2018 and December 31, 2017 , respectively: 2018 2017 Fair Value Hierarchy Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial instruments not carried at fair value: Subordinated promissory note receivable Level 2 $ 106.2 $ 111.0 $ 95.3 $ 83.3 Long-term debt excluding capitalized Level 2 $ 2,282.3 $ 2,335.0 $ 2,280.6 $ 2,439.8 The Company received a 10.0% non-participating interest in VCVH Holdings LLC in 2016 with the sale of the Company's healthcare business. As of June 30, 2018 , the balance of this investment was $8.4 million and accounted for as a cost based investment under ASC 323-10-25, The Equity Method of Accounting for Investments in Common Stock ("ASC 323-10-25"), because the interest is currently non-participating, and the Company does not have the ability to exercise significant influence over the investees’ operating and financial policies. As of June 30, 2018 , the Company also had an investment in a limited partnership of $7.1 million accounted for in accordance with ASC 323-10-25 as an equity method investment.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions: 2018 Acquisitions On June 20, 2018, the Company acquired 100 percent of the stock of Validus-IVC Limited ("Validus"), a provider of claims management solutions and developer of the subrogation portal in the UK, verify TM , for a net cash purchase price of $46.1 million , of which $5.9 million represents contingent escrows. Validus has become part of the claims category within the Company's Insurance segment. The integration of Validus' verify TM platform with the Company's global claims analytic services allows insurers to take advantage of enhanced analytic and technology tools to help improve and automate the claims settlement process. The preliminary purchase price allocation of the acquisition is presented in the table below. On February 21, 2018, the Company acquired 100 percent of the stock of Business Insight Limited (“Business Insight”), a provider of predictive analytics for insurers in the U.K. and Ireland, for a net cash purchase price of $17.1 million , including a holdback of $0.9 million . Business Insight has become part of the underwriting and ratings category within the Insurance segment. Business Insight offers a comprehensive set of peril models to support underwriting and rating for the commercial property and homeowners insurance market. The preliminary purchase price allocation of the acquisition is presented as part of "Others" in the table below. On January 5, 2018, the Company acquired 100 percent of the stock of Marketview Limited ("Marketview") for a net cash purchase price of $4.0 million , of which $0.4 million represents indemnity escrows. Marketview is a provider of consumer spending analysis and insights across the retail, hospitality, property, and government sectors in New Zealand. Marketview has become part of the Financial Services segment. The acquisition helps expand the Company's solutions related to consumer spending analytics across the Australasia and Oceania regions by combining its domain expertise and proprietary data assets with those of Marketview. The preliminary purchase price allocation of the acquisition is presented as part of "Others" in the table below. The preliminary purchase price allocations of the 2018 acquisitions resulted in the following: Validus Others Total Cash and cash equivalents $ 0.9 $ 2.2 $ 3.1 Accounts receivable 1.3 1.1 2.4 Current assets 6.2 0.3 6.5 Fixed assets 0.5 0.2 0.7 Intangible assets 20.7 8.3 29.0 Goodwill 25.3 15.8 41.1 Other assets — 0.4 0.4 Total assets acquired 54.9 28.3 83.2 Current liabilities 4.1 1.0 5.1 Deferred revenues 0.1 1.1 1.2 Deferred income taxes, net 3.5 1.6 5.1 Other liabilities 0.2 1.3 1.5 Total liabilities assumed 7.9 5.0 12.9 Net assets acquired 47.0 23.3 70.3 Cash acquired (0.9 ) (2.2 ) (3.1 ) Net cash purchase price $ 46.1 $ 21.1 $ 67.2 The preliminary amounts assigned to intangible assets by type for the 2018 acquisitions are summarized in the table below: Weighted Average Useful Life Total Technology-related 6 years $ 12.6 Marketing-related 8 years 1.1 Customer-related 10 years 15.3 Total intangible assets $ 29.0 The preliminary allocations of the purchase price for the 2017 and 2018 acquisitions with less than a year ownership are subject to revisions as additional information is obtained about the facts and circumstances that existed as of each acquisition date. The revisions may have a significant impact on the condensed consolidated financial statements. The allocations of the purchase price will be finalized once all information is obtained, but not to exceed one year from the acquisition date. The primary areas of the purchase price allocation that are not yet finalized relate to operating leases, income and non-income taxes, deferred revenues, the valuation of intangible assets acquired, and residual goodwill. The preliminary amounts assigned to intangible assets by type for these acquisitions were based upon the Company's valuation model and historical experiences with entities with similar business characteristics. For the six months ended June 30, 2018 , the Company finalized the purchase accounting for the acquisitions of Arium Limited ("Arium"), Healix International Holdings Limited ("Healix"), Emergent Network Intelligence Limited ("ENI"), Fintellix Solutions Private Limited ("Fintellix"), MAKE Consulting A/S ("MAKE"), and the net assets of Blue Skies Consulting, LLC, ControlCam, LLC, Krawietz Aerial Photography, LLC, Richard Crouse & Associates, Inc., Rocky Mountain Aerial Surveys, Inc., Skyview Aerial Photo, Inc., and Valley Air Photos, LLC (collectively referred to as "Aerial Imagery acquisitions") during the measurement periods in accordance with ASC 805, Business Combinations . The impact of finalization of the purchase accounting associated with these acquisitions were not material to the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017 . For the three and six months ended June 30, 2018 , the Company incurred transaction costs of $0.5 million and $1.2 million , respectively for the 2018 acquisitions. For the three and six months ended June 30, 2017 , the Company incurred transaction costs of $1.4 million and $2.7 million , respectively, related to the 2017 acquisitions. The transaction costs were included within "Selling, general and administrative" expenses in the accompanying condensed consolidated statements of operations. For the 2018 acquisitions, the goodwill of $41.1 million associated with the stock purchases of Marketview, Business Insight and Validus is not deductible for tax purposes. The 2018 acquisitions were immaterial, both individually and in the aggregate, to the Company's condensed consolidated financial statements for the three and six months ended June 30, 2018 and 2017 and therefore, supplemental information disclosure on an unaudited pro forma basis is not presented. Acquisition Escrows and Related Liabilities Pursuant to the related acquisition agreements, the Company has funded various escrow accounts to satisfy pre-acquisition indemnity and tax claims arising subsequent to the acquisition date, as well as a portion of the contingent payments. At June 30, 2018 and December 31, 2017 , the current portion of the escrows amounted to $44.9 million and $22.9 million , and the noncurrent portion of the escrows amounted to zero and $26.3 million , respectively. The current and noncurrent portions of the escrows have been included in “Other current assets” and "Other assets" in the accompanying condensed consolidated balance sheets, respectively. The acquisitions of PowerAdvocate and Validus include acquisition related contingencies, for which the sellers of PowerAdvocate and Validus could receive additional payments by achieving the specific predetermined revenue and EBITDA earn-out targets for exceptional performance. As of each respective acquisition date, the Company recorded acquisition related liabilities and goodwill of $34.2 million associated with PowerAdvocate and $3.1 million associated with Validus. The Company believes that the liabilities recorded as of June 30, 2018 reflect the best estimate of acquisition contingent payments. The acquisition related liabilities of these acquisitions of $7.5 million and $29.8 million have been included in “Accounts payable and accrued liabilities” and “Other liabilities” in the accompanying condensed consolidated balance sheets as of June 30, 2018 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets: The following is a summary of the change in goodwill from December 31, 2017 through June 30, 2018 , both in total and as allocated to the Company’s operating segments: Insurance Energy and Specialized Markets Financial Services Total Goodwill, net at December 31, 2017 (1) $ 749.5 $ 2,149.6 $ 469.6 $ 3,368.7 Current period acquisitions 38.3 — 2.8 41.1 Purchase accounting reclassification 4.7 (1.9 ) 2.7 5.5 Foreign currency translation (7.3 ) (34.3 ) (1.0 ) (42.6 ) Goodwill, net at June 30, 2018 (1) $ 785.2 $ 2,113.4 $ 474.1 $ 3,372.7 _______________ (1) These balances are net of accumulated impairment charges of $3.2 million that occurred prior to December 31, 2017 . Goodwill and intangible assets with indefinite lives are subject to impairment testing annually as of June 30, or whenever events or changes in circumstances indicate that the carrying amount may not be fully recoverable. Goodwill impairment testing compares the carrying value of each reporting unit to its fair value. If the fair value of the reporting unit exceeds the carrying value of the net assets, including goodwill assigned to that reporting unit, goodwill is not impaired. If the carrying value of the reporting unit’s net assets including goodwill exceeds the fair value of the reporting unit, then the Company will determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss is recorded for the difference between the carrying amount and the implied fair value of goodwill. The Company completed the required annual impairment test as of June 30, 2018 , and concluded that there was no impairment of goodwill. The Company’s intangible assets and related accumulated amortization consisted of the following: Weighted Average Useful Life Cost Accumulated Amortization Net June 30, 2018 Technology-based 8 years $ 429.8 $ (239.2 ) $ 190.6 Marketing-related 16 years 260.4 (70.4 ) 190.0 Contract-based 6 years 5.0 (5.0 ) — Customer-related 14 years 711.9 (199.2 ) 512.7 Database-related 19 years 465.6 (69.4 ) 396.2 Total intangible assets $ 1,872.7 $ (583.2 ) $ 1,289.5 December 31, 2017 Technology-based 8 years $ 421.0 $ (222.9 ) $ 198.1 Marketing-related 17 years 263.9 (62.9 ) 201.0 Contract-based 6 years 5.0 (5.0 ) — Customer-related 14 years 704.2 (174.0 ) 530.2 Database-related 19 years 474.7 (58.7 ) 416.0 Total intangible assets $ 1,868.8 $ (523.5 ) $ 1,345.3 Amortization expense related to intangible assets for the three months ended June 30, 2018 and 2017 was $32.0 million and $23.9 million , respectively. Amortization expense related to intangible assets for the six months ended June 30, 2018 and 2017 was $65.2 million and $46.2 million , respectively. Estimated amortization expense for the remainder of 2018 and the years through 2023 and thereafter for intangible assets subject to amortization is as follows: Year Amount 2018 $ 64.9 2019 129.2 2020 127.2 2021 116.7 2022 105.4 2023 and thereafter 746.1 $ 1,289.5

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: The Company’s effective tax rate for the three and six months ended June 30, 2018 was 17.03% and 17.50% , compared to the effective tax rate for the three and six months ended June 30, 2017 of 28.80% and 30.59% . The effective tax rate for the three and six months ended June 30, 2018 is lower than the effective tax rate for the three and six months ended June 30, 2017 primarily due to the impact of tax reform lowering the U.S. tax rate from 35.0% to 21.0%, as well as the impact of greater tax benefits from equity compensation in the current period versus the prior period. The difference between statutory tax rates and the Company’s effective tax rate is primarily due to tax benefits attributable to equity compensation, offset by additional state and local income taxes.

Debt

Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt: The following table presents short-term and long-term debt by issuance as of June 30, 2018 and December 31, 2017 : Issuance Date Maturity Date 2018 2017 Short-term debt and current portion of long-term debt: Syndicated revolving credit facility Various Various $ 480.0 $ 715.0 Capital lease obligations Various Various 7.2 9.4 4.875% senior notes, less unamortized discount 12/8/2011 1/15/2019 249.7 — Short-term debt and current portion of long-term 736.9 724.4 Long-term debt: Senior notes: 4.000% senior notes, less unamortized discount 5/15/2015 6/15/2025 891.5 890.9 5.500% senior notes, less unamortized discount 5/15/2015 6/15/2045 345.2 345.1 4.125% senior notes, less unamortized discount 9/12/2012 9/12/2022 347.4 347.1 4.875% senior notes, less unamortized discount 12/8/2011 1/15/2019 — 249.3 5.800% senior notes, less unamortized discount 4/6/2011 5/1/2021 448.5 448.2 Capital lease obligations Various Various 15.0 7.6 Syndicated revolving credit facility debt issuance Various Various (3.4 ) (3.8 ) Long-term debt 2,044.2 2,284.4 Total debt $ 2,781.1 $ 3,008.8 As of June 30, 2018 and December 31, 2017 , the Company had senior notes with an aggregate principal amount of $2,300.0 million outstanding and was in compliance with their financial debt covenants. As of June 30, 2018 , the Company had a borrowing capacity of $1,500.0 million under the committed senior unsecured Syndicated Revolving Credit Facility (the "Credit Facility") with Bank of America N.A., JP Morgan Chase, N.A., and a syndicate of banks. The Credit Facility may be used for general corporate purposes, including working capital needs and capital expenditures, acquisitions and the share repurchase program (the "Repurchase Program"). The Company was in compliance with all financial debt covenants under the Credit Facility as of June 30, 2018 . As of June 30, 2018 and December 31, 2017 , the Company had outstanding borrowings under the Credit Facility of $480.0 million and $715.0 million , respectively. Subsequent to June 30, 2018 , the Company had borrowings of $50.0 million and repayments of $95.0 million under the Credit Facility.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity: The Company's common shares have rights to any dividend declared by the board of directors (the "Board"), subject to any preferential or other rights of any outstanding preferred stock, and voting rights to elect all twelve members of the Board. The Company has 80,000,000 shares of authorized preferred stock, par value $0.001 per share. The preferred shares have preferential rights over the common shares with respect to dividends and net distribution upon liquidation. The Company did not issue any preferred shares as of June 30, 2018 . Share Repurchase Program Since May 2010, the Company has authorized repurchases of up to $3,300.0 million of its common stock through its Repurchase Program, including an additional authorization of $500.0 million approved on May 16, 2018. The Company has repurchased shares with an aggregate value of $2,614.2 million . The Company repurchased 1,711,166 shares of common stock with an aggregate value of $180.4 million during the six months ended June 30, 2018 . As of June 30, 2018 , the Company had $685.8 million available to repurchase shares through its Repurchase Program. On June 15, 2018, the Company entered into an Accelerated Share Repurchase ("ASR") agreement to repurchase shares of its common stock for an aggregate purchase price of $50.0 million . The ASR agreement is accounted for as an initial treasury stock transaction and a forward stock purchase agreement indexed to the Company's own common stock. The forward stock purchase agreement is classified as an equity instrument under ASC 815-40, Contracts in Entity's Own Equity ("ASC 815-40") and was deemed to have a fair value of zero at the effective date. Upon payment of the aggregate purchase price on July 2, 2018, the Company received an initial delivery of 371,609 shares of its common stock at a price of $107.64 per share, representing approximately $40.0 million of the aggregate purchase price. The aggregate purchase price was recorded as a reduction to stockholders' equity, consisting of a $40.0 million increase in treasury stock and a $10.0 million decrease in additional paid-in capital, in the Company's condensed consolidated statements of changes in stockholders' equity subsequent to June 30, 2018. Upon the final settlement of the ASR agreement in September 2018, the Company may be entitled to receive additional shares of its common stock or, under certain limited circumstances, be required to deliver shares to the counterparty. Treasury Stock As of June 30, 2018 , the Company’s treasury stock consisted of 379,278,995 shares of common stock. During the six months ended June 30, 2018 , the Company reissued 1,556,279 shares of common stock from the treasury shares at a weighted average price of $8.47 per share. Earnings Per Share (“EPS”) Basic EPS is computed by dividing net income by the weighted average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding, using the treasury stock method, if the dilutive potential common shares, including stock options, nonvested restricted stock awards, nonvested restricted stock units, and nonvested deferred stock units, had been issued. The following is a presentation of the numerators and denominators of the basic and diluted EPS computations for the three and six months ended June 30, 2018 and 2017 : Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator used in basic and diluted EPS: Net income $ 153.5 $ 121.0 $ 286.5 $ 229.8 Denominator: Weighted average number of common shares used 165,015,642 164,922,237 165,029,345 165,682,614 Effect of dilutive shares: Potential common shares issuable from stock 3,635,560 3,392,059 3,792,524 3,549,965 Weighted average number of common shares 168,651,202 168,314,296 168,821,869 169,232,579 The potential shares of common stock that were excluded from diluted EPS were 906,866 and 2,722,518 for the three months ended June 30, 2018 and 2017 , and 455,292 and 2,002,341 for the six months ended June 30, 2018 and 2017 , respectively, because the effect of including these potential shares was anti-dilutive. Accumulated Other Comprehensive Losses The following is a summary of accumulated other comprehensive losses as of June 30, 2018 and December 31, 2017 : 2018 2017 Foreign currency translation adjustment $ (397.3 ) $ (334.4 ) Unrealized holding gains on available-for-sale securities, net of tax — (1) 0.7 Pension and postretirement adjustment, net of tax (76.9 ) (78.6 ) Accumulated other comprehensive losses $ (474.2 ) $ (412.3 ) _______________ (1) Includes an adjustment of $0.7 million to opening retained earnings related to adoption of ASU 2016-01 at January 1, 2018 . The before tax and after tax amounts of other comprehensive income for the three and six months ended June 30, 2018 and 2017 are summarized below: Before Tax Tax (Expense) Benefit After Tax For the Three Months Ended June 30, 2018 Foreign currency translation adjustment $ (165.6 ) $ — $ (165.6 ) Pension and postretirement adjustment before reclassifications 1.6 (0.2 ) 1.4 Amortization of net actuarial loss and prior service benefit (1) (0.9 ) 0.2 (0.7 ) Pension and postretirement adjustment 0.7 — 0.7 Total other comprehensive loss $ (164.9 ) $ — $ (164.9 ) For the Three Months Ended June 30, 2017 Foreign currency translation adjustment $ 89.6 $ — $ 89.6 Unrealized holding gain on available-for-sale securities before (1) 0.1 — 0.1 Unrealized holding gain on available-for-sale securities 0.1 — 0.1 Pension and postretirement adjustment before reclassifications 2.7 (1.1 ) 1.6 Amortization of net actuarial loss and prior service benefit (1) (1.3 ) 0.5 (0.8 ) Pension and postretirement adjustment 1.4 (0.6 ) 0.8 Total other comprehensive gain $ 91.1 $ (0.6 ) $ 90.5 Before Tax Tax (Expense) Benefit After Tax For the Six Months Ended June 30, 2018 Foreign currency translation adjustment $ (62.9 ) $ — $ (62.9 ) Pension and postretirement adjustment before reclassifications 3.7 (0.7 ) 3.0 Amortization of net actuarial loss and prior service benefit (1) (1.8 ) 0.5 (1.3 ) Pension and postretirement adjustment 1.9 (0.2 ) 1.7 Total other comprehensive loss $ (61.0 ) $ (0.2 ) $ (61.2 ) For the Six Months Ended June 30, 2017 Foreign currency translation adjustment $ 122.7 $ — $ 122.7 Unrealized holding gain on available-for-sale securities before 0.3 (0.1 ) 0.2 Unrealized holding gain on available-for-sale securities 0.3 (0.1 ) 0.2 Pension and postretirement adjustment before reclassifications 5.0 (2.0 ) 3.0 Amortization of net actuarial loss and prior service benefit (1) (2.5 ) 1.0 (1.5 ) Pension and postretirement adjustment 2.5 (1.0 ) 1.5 Total other comprehensive gain $ 125.5 $ (1.1 ) $ 124.4 _______________ (1) These accumulated other comprehensive loss components, before tax, are included under “Cost of revenues” and “Selling, general and administrative” in the accompanying condensed consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (see Note 12 Pension and Postretirement Benefits for additional details).

Equity Compensation Plans

Equity Compensation Plans	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Compensation Plans	Equity Compensation Plans: Equity Compensation Plans All of the Company’s outstanding stock options and restricted stock awards are covered under the 2013 Incentive Plan, 2009 Incentive Plan or the 1996 Incentive Plan. Awards under the 2013 Incentive Plan may include one or more of the following types: (i) stock options (both nonqualified and incentive stock options), (ii) stock appreciation rights, (iii) restricted stock, (iv) restricted stock units, (v) performance awards, (vi) other share based awards, and (vii) cash. Employees, directors and consultants are eligible for awards under the 2013 Incentive Plan. The Company issued common stock under these plans from the Company’s treasury shares. As of June 30, 2018 , there were 5,616,912 shares of common stock reserved and available for future issuance under the 2013 Incentive Plan. Cash received from stock option exercises for the six months ended June 30, 2018 and 2017 was $47.0 million and $22.4 million, respectively. The Company granted equity awards to key employees of the Company. The nonqualified stock options have an exercise price equal to the closing price of the Company’s common stock on the grant date, with a ten -year contractual term. The fair value of the restricted stock is determined using the closing price of the Company’s common stock on the grant date. The restricted stock is not assignable or transferable until it becomes vested. Performance share units (“PSU”) vest at the end of a three -year performance period, subject to the recipient’s continued service. Each PSU represents the right to receive one share of Verisk common stock and the ultimate realization is based on the Company’s achievement of certain market performance criteria and may range from 0% to 200% of the recipient’s target levels established on the grant date. The fair value of performance share units is determined on the grant date using the Monte Carlo Simulation model. The Company recognizes the expense of the equity awards ratably over the vesting period. A summary of the equity awards granted for the six months ended June 30, 2018 is presented below. Grant Date Service Vesting Period Stock Options Restricted Stock Performance Share Units January 1 to June 30, 2018 Four-year graded vesting 944 194 — April 1, 2018 Four-year graded vesting 873,383 187,462 — April 1, 2018 Three-year cliff vesting — — 46,705 April 16, 2018 Four-year graded vesting 11,491 2,338 — 885,818 189,994 46,705 On July 1, 2018, the Company granted 1,858 shares of common stock and 19,798 shares of nonqualified stock options that were immediately vested, 17,402 non-qualified stock options with a one -year service period that vests ratably over twelve months, and 12,716 deferred stock units to the Directors of the Company. The fair value of the stock options granted for the six months ended June 30, 2018 and 2017 was estimated using a Black-Scholes valuation model that uses the weighted average assumptions noted in the following table: 2018 2017 Option pricing model Black-Scholes Black-Scholes Expected volatility 18.52 % 18.71 % Risk-free interest rate 2.51 % 1.82 % Expected term in years 4.4 4.5 Dividend yield — % — % Weighted average grant date fair value per stock option $ 21.23 $ 15.64 The expected term for the stock options granted was estimated based on studies of historical experience and projected exercise behavior. However, for certain awards granted, for which no historical exercise pattern exists, the expected term was estimated using the simplified method. The risk-free interest rate is based on the yield of U.S. Treasury zero coupon securities with a maturity equal to the expected term of the equity award. The volatility factor is calculated using historical daily closing prices over the most recent period that is commensurate with the expected term of the stock option award. The expected dividend yield was based on the Company’s expected annual dividend rate on the date of grant. A summary of the stock options outstanding and exercisable as of December 31, 2017 and June 30, 2018 and changes during the interim period are presented below: Number Weighted Aggregate Outstanding at December 31, 2017 8,907,109 $ 53.31 $ 380.2 Granted 885,818 $ 104.04 Exercised (1,369,268 ) $ 36.70 $ 92.9 Cancelled or expired (222,517 ) $ 77.11 Outstanding at June 30, 2018 8,201,142 $ 60.92 $ 383.2 Exercisable at June 30, 2018 5,685,763 $ 49.06 $ 333.1 Exercisable at December 31, 2017 5,995,339 $ 41.50 $ 326.8 Intrinsic value for stock options is calculated based on the exercise price of the underlying awards and the quoted price of Verisk common stock as of the reporting date. Excess tax benefits from exercised stock options were recorded as income tax benefit in the condensed consolidated statements of operations. This tax benefit is calculated as the excess of the intrinsic value of options exercised and restricted stock lapsed in excess of compensation recognized for financial reporting purposes. Stock-based compensation expense for the six months ended June 30, 2018 and 2017 was $19.8 million and $15.4 million , respectively. The Company estimates expected forfeitures of equity awards at the date of grant and recognizes compensation expense only for those awards that the Company expects to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate. Changes in the forfeiture assumptions may impact the total amount of expense ultimately recognized over the requisite service period and may impact the timing of expense recognized over the requisite service period. A summary of the status of the restricted stock and performance share units awarded under the 2013 Incentive Plan as of December 31, 2017 and June 30, 2018 and changes during the interim period are presented below: Number Weighted Average Grant Outstanding at December 31, 2017 604,464 $ 78.28 Granted 236,699 $ 111.27 Vested (205,731 ) $ 75.09 Forfeited (44,246 ) $ 87.66 Outstanding at June 30, 2018 591,186 $ 91.87 The Company’s employee stock purchase plan (“ESPP”) offers eligible employees the opportunity to purchase shares of the Company’s common stock at a discount of its fair market value at the time of purchase. During the six months ended June 30, 2018 and 2017 , the Company issued 14,779 and 15,854 shares of common stock at a weighted discounted price of $100.57 and $78.65 for the ESPP, respectively. As of June 30, 2018 , there was $90.0 million of total unrecognized compensation costs, exclusive of the impact of vesting upon retirement eligibility, related to nonvested share-based compensation arrangements granted under the 2009 and 2013 Incentive Plans. That cost is expected to be recognized over a weighted average period of 2.83 years. As of June 30, 2018 , there were 2,515,379 and 590,945 nonvested stock options and restricted stock, respectively, of which 2,119,518 and 512,356 are expected to vest. The total grant date fair value of options vested was $7.7 million during the six months ended June 30, 2018 and 2017 . The total grant date fair value of restricted stock vested during the six months ended June 30, 2018 and 2017 was $9.1 million and $8.3 million , respectively.

Pension and Postretirement Bene

Pension and Postretirement Benefits	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Pension and Postretirement Benefits	Pension and Postretirement Benefits: The Company maintained a frozen qualified defined benefit pension plan for certain of its employees through membership in the Pension Plan for Insurance Organizations (the “Pension Plan”), a multiple-employer trust. The Company has applied a cash balance formula to determine future benefits. Under the cash balance formula, each participant has an account, which is credited annually based on the interest earned on the previous year-end cash balance. The Company also has a frozen non-qualified supplemental cash balance plan (“SERP”) for certain employees. The SERP is funded from the general assets of the Company. The Company also provides certain healthcare and life insurance benefits to certain qualifying active and retired employees. The Postretirement Health and Life Insurance Plan (the “Postretirement Plan”), which has been frozen, is contributory, requiring participants to pay a stated percentage of the premium for coverage. The components of net periodic (benefit) cost for the three and six months ended June 30, are summarized below: Pension Plan and SERP Postretirement Plan For the Three Months Ended June 30, 2018 2017 2018 2017 Interest cost $ 4.0 $ 4.4 $ 0.1 $ 0.1 Expected return on plan assets (8.7 ) (7.7 ) — (0.1 ) Amortization of prior service credit 0.1 — (0.1 ) — Amortization of net actuarial loss 0.8 1.2 0.1 0.1 Net periodic (benefit) cost $ (3.8 ) $ (2.1 ) $ 0.1 $ 0.1 Employer contributions, net $ 0.3 $ 0.3 $ (0.2 ) $ 0.2 Pension Plan and SERP Postretirement Plan For the Six Months Ended June 30, 2018 2017 2018 2017 Interest cost $ 7.6 $ 8.6 $ 0.2 $ 0.2 Expected return on plan assets (16.4 ) (15.5 ) (0.1 ) (0.2 ) Amortization of prior service cost 0.1 0.1 (0.1 ) — Amortization of net actuarial loss 1.6 2.2 0.2 0.2 Net periodic (benefit) cost $ (7.1 ) $ (4.6 ) $ 0.2 $ 0.2 Employer contributions, net $ 0.5 $ 0.5 $ (0.3 ) $ 0.6 The expected contributions to the Pension Plan, SERP and Postretirement Plan for the year ending December 31, 2018 are consistent with the amounts previously disclosed as of December 31, 2017 .

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting: ASC 280-10, Disclosures About Segments of an Enterprise and Related Information (“ASC 280-10”), establishes standards for reporting information about operating segments. ASC 280-10 requires that a public business enterprise reports financial and descriptive information about its operating segments. Operating segments are components of an enterprise for which separate financial information is available that is evaluated regularly by the CODM in deciding how to allocate resources and in assessing performance. The Company’s President and CEO is identified as the CODM as defined by ASC 280-10. The Company previously reported results based on its two operating segments, Decision Analytics and Risk Assessment. During the first quarter of 2018, the CODM changed how he makes operating decisions, assesses the performance of the business, and allocates resources in a manner that caused its operating segments to change. Consequently, effective as of the first quarter of 2018, the operating segments of the Company are based on three vertical markets it serves: Insurance, Energy and Specialized Markets, and Financial Services. These three operating segments are also the Company's reportable segments, which have been recast to reflect the new segments for the three and six months ended June 30, 2017 . Insurance: The Company is the leading provider of statistical, actuarial and underwriting data for the U.S. P&C insurance industry. The Company’s databases include cleansed and standardized records describing premiums and losses in insurance transactions, casualty and property risk attributes for commercial buildings and their occupants and fire suppression capabilities of municipalities. The Company uses this data to create policy language and proprietary risk classifications that are industry standards and to generate prospective loss cost estimates used to price insurance policies. The Company also develops solutions that its customers use to analyze key processes in managing risk. The Company’s combination of algorithms and analytic methods incorporates its proprietary data to generate solutions. In most cases, the Company’s customers integrate the solutions into their models, formulas or underwriting criteria in order to predict potential loss events, ranging from hurricanes to earthquakes. The Company develops catastrophe and extreme event models and offers solutions covering natural and man-made risks, including acts of terrorism. The Company further develops solutions that allow customers to quantify costs after loss events occur. The Company's multitier, multispectral terrestrial imagery and data acquisition, processing, analytics, and distribution system using the remote sensing and machine learning technologies help gather, store, process, and deliver geographic and spatially referenced information that supports uses in many markets. Additionally, the Company offers fraud-detection solutions including review of data on claim histories, analysis of claims to find emerging patterns of fraud, and identification of suspicious claims in the insurance sector. The Company’s underwriting & rating, insurance anti-fraud claims, catastrophe modeling, loss quantification and aerial imagery solutions are included in this segment. Energy and Specialized Markets: The Company is a leading provider of data analytics for the global energy, chemicals, and metals and mining industries. Its research and consulting solutions focus on exploration strategies and screening, asset development and acquisition, commodity markets, and corporate analysis in the areas of business environment, business improvement, business strategies, commercial advisory, and transaction support. The Company gathers and manages proprietary information, insight, and analysis on oil and gas fields, mines, refineries and other assets across the interconnected global energy sectors to advise customers in making asset investment and portfolio allocation decisions. The Company also helps businesses and governments better anticipate and manage climate and weather-related risks. The Company's analytical tools measure and observe environmental properties and translate those measurements into actionable information based on customer needs. The Company further offers a suite of data and information services that enable improved compliance with global Environmental Health and Safety requirements related to the safe manufacturing, distribution, transportation, usage, and disposal of chemicals and products. The Company’s energy business, environmental health and safety services and, weather risk solutions are included in this segment. Financial Services: The Company maintains a bank account consortia to provide competitive benchmarking, decisioning algorithms, business intelligence, and customized analytic services that help financial institutions, payment networks and processors, alternative lenders, regulators and merchants make better strategy, marketing, and risk decisions. Customers apply the Company's solutions in the areas of tailored data management and media effectiveness that include business intelligence platforms, profile views, mobile data solutions, enterprise database services, and fraud risk scoring algorithms for marketing, fraud, and risk mitigation. In addition, the Company's bankruptcy management solutions assist creditors, debt servicing businesses and credit services to enhance regulatory compliance by eliminating stay violation and portfolio valuation risk. The Company’s financial services and retail analytics solutions are included in this segment. The three aforementioned operating segments represent the segments for which discrete financial information is available and upon which operating results are regularly evaluated by the CODM in order to assess performance and allocate resources. The Company uses EBITDA as the profitability measure for making decisions regarding ongoing operations. EBITDA is net income before interest expense, provision for income taxes, depreciation and amortization of fixed and intangible assets. EBITDA is the measure of operating results used to assess corporate performance and optimal utilization of debt and acquisitions. Operating expenses consist of direct and indirect costs principally related to personnel, facilities, software license fees, consulting, travel, and third-party information services. Indirect costs are generally allocated to the segments using fixed rates established by management based upon estimated expense contribution levels and other assumptions that management considers reasonable. The Company does not allocate interest expense and provision for income taxes, since these items are not considered in evaluating the segment’s overall operating performance. In addition, the CODM does not evaluate the financial performance of each segment based on assets. See Note 3 Revenues for information on disaggregated revenues by type of service and by country. The following table provides the Company’s revenue and EBITDA by reportable segment for the three and six months ended June 30, 2018 and 2017 , and the reconciliation of EBITDA to operating income as shown in the accompanying condensed consolidated statements of operations: For the Three Months Ended June 30, 2018 June 30, 2017 Insurance Energy and Specialized Markets Financial Services Total Insurance Energy and Specialized Markets Financial Services Total Revenues $ 429.4 $ 129.9 $ 42.0 $ 601.3 $ 382.4 $ 110.3 $ 30.5 $ 523.2 Expenses: Cost of revenues (141.6 ) (56.3 ) (24.5 ) (222.4 ) (125.9 ) (48.8 ) (19.0 ) (193.7 ) Selling, general and (53.3 ) (34.9 ) (4.8 ) (93.0 ) (49.1 ) (27.7 ) (2.0 ) (78.8 ) Investment income and 1.8 2.5 0.3 4.6 3.0 0.3 0.1 3.4 EBITDA 236.3 41.2 13.0 290.5 210.4 34.1 9.6 254.1 Depreciation and (25.0 ) (11.0 ) (5.6 ) (41.6 ) (21.8 ) (8.5 ) (1.5 ) (31.8 ) Amortization of (5.4 ) (21.2 ) (5.4 ) (32.0 ) (2.9 ) (17.4 ) (3.6 ) (23.9 ) Less: Investment income (1.8 ) (2.5 ) (0.3 ) (4.6 ) (3.0 ) (0.3 ) (0.1 ) (3.4 ) Operating income $ 204.1 $ 6.5 $ 1.7 212.3 $ 182.7 $ 7.9 $ 4.4 195.0 Investment income and others, 4.6 3.4 Interest expense (31.9 ) (28.5 ) Income before income $ 185.0 $ 169.9 For the Six Months Ended June 30, 2018 June 30, 2017 Insurance Energy and Specialized Markets Financial Services Total Insurance Energy and Specialized Markets Financial Services Total Revenues $ 842.1 $ 255.4 $ 85.0 $ 1,182.5 $ 749.3 $ 216.6 $ 59.9 $ 1,025.8 Expenses: Cost of revenues (280.2 ) (112.0 ) (51.4 ) (443.6 ) (246.1 ) (94.5 ) (36.0 ) (376.6 ) Selling, general and (105.9 ) (69.0 ) (10.0 ) (184.9 ) (94.5 ) (55.8 ) (4.4 ) (154.7 ) Investment income and 4.3 0.4 0.6 5.3 5.6 (0.5 ) 0.2 5.3 EBITDA 460.3 74.8 24.2 559.3 414.3 65.8 19.7 499.8 Depreciation and (52.3 ) (22.0 ) (7.7 ) (82.0 ) (45.4 ) (17.0 ) (3.2 ) (65.6 ) Amortization of (10.9 ) (42.8 ) (11.5 ) (65.2 ) (5.0 ) (34.3 ) (6.9 ) (46.2 ) Less: Investment income (4.3 ) (0.4 ) (0.6 ) (5.3 ) (5.6 ) 0.5 (0.2 ) (5.3 ) Operating income $ 392.8 $ 9.6 $ 4.4 406.8 $ 358.3 $ 15.0 $ 9.4 382.7 Investment income and others, 5.3 5.3 Interest expense (64.8 ) (56.9 ) Income before income $ 347.3 $ 331.1 Long-lived assets by country are provided below: June 30, 2018 December 31, 2017 Long-lived assets: U.S $ 2,461.9 $ 2,438.6 U.K. 2,627.9 2,656.6 Other countries 324.7 327.5 Total long-lived assets $ 5,414.5 $ 5,422.7

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Parties	Related Parties: The Company considers its stockholders that own more than 5.0% of the outstanding common stock to be related parties as defined within ASC 850, Related Party Disclosures . As of June 30, 2018 and December 31, 2017 , the Company had no material transactions with related parties.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: The Company is a party to legal proceedings with respect to a variety of matters in the ordinary course of business, including the matter described below. With respect to the ongoing matter, the Company is unable, at the present time, to determine the ultimate resolution of or provide a reasonable estimate of the range of possible loss attributable to this matter or the impact it may have on the Company’s results of operations, financial position or cash flows. Although the Company believes it has strong defenses and intends to vigorously defend this matter, the Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations, financial position or cash flows. Xactware Solutions, Inc. Patent Litigation On October 8, 2015, the Company was served with a summons and complaint in an action titled Eagle View Technologies, Inc. and Pictometry International Group, Inc. v. Xactware Solutions, Inc. and Verisk Analytics, Inc. filed in the United States District Court for the District of New Jersey. The complaint alleges that the Company’s Roof InSight (now known as Geomni Roof), Property InSight product (now known as Geomni Property) and Aerial Sketch product in combination with the Company's Xactimate product infringe seven patents owned by Eagle View and Pictometry namely, Patent Nos. 436, 840, 152, 880, 770, 732 and 454. On November 30, 2015, plaintiffs filed a First Amended Complaint adding Patent Nos. 376 and 737 to the lawsuit. The First Amended Complaint seeks an entry of judgment by the Court that defendants have and continue to directly infringe and/or indirectly infringe, including by way of inducement the Patents-in-Suit, permanent injunctive relief, damages, costs and attorney’s fees. On May 19, 2017, the District Court so ordered a Joint Stipulated Order of Partial Dismissal with Prejudice dismissing all claims or assertions pertaining to Pictometry Patents Nos. 880 and 732 and certain asserted claims of the Eagle View Patents Nos. 436, 840, 152, 770, 454, 376 and 737 (collectively the “Patents in Suit”). Eagle View further reduced the number of asserted claims pertaining to the Patents in Suit to 18 asserted claims. Fact discovery and expert discovery are now closed and summary judgment motions are due on August 31, 2018. At this time, it is not reasonably possible to determine the ultimate resolution of, or estimate the liability related to, this matter.

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition The following describes the Company’s primary types of revenues and the applicable revenue recognition policies. The Company’s revenues are primarily derived from the sales of services and revenue is recognized when control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for those services. Revenue is recognized net of applicable sales tax withholdings. The Company recognizes revenues through subscriptions, long-term agreements and on a transactional basis, recurring and nonrecurring. Subscriptions for the solutions are generally paid in advance of rendering services either quarterly or in full upon commencement of the subscription period, which is usually for one year and automatically renewed each year. The long-term agreements are generally for periods of three to five years. The Company recognizes revenue from subscriptions ratably over the term of the subscription and most long-term agreements are recognized ratably over the term of the agreement. As the Company offers most of its solutions through a hosting environment, revenue on the majority of the contracts is recognized over time because of the customer's continuous right to use the solutions as soon as access is provided. In addition, the Company performs certain discrete project based consulting services which are recognized over time by measuring the progress toward complete satisfaction of the performance obligation, based on the input method of consulting hours worked; this aligns with the results achieved and value transferred to the customer. The hours consumed are best reflective of the measure of progress towards satisfying the performance obligation, as the resources hours worked directly tie to the progress of the services to be provided. Certain solutions are also paid for by customers on a transactional basis. The Company recognizes these revenues as the solutions are delivered or services performed. In general, they are billed monthly at the end of each month. Insurance Revenue Industry-standard insurance programs, statistical agent and data services and actuarial services are sold to participating insurance company customers under annual agreements covering a calendar year where the price is determined at the inception of the agreement. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. In accordance with Topic 606, the Company recognizes revenue ratably over the term of these annual agreements under the series guidance, as services are performed and continuous access to information is provided over the entire term of the agreements. Also within the Insurance segment, the Company licenses hosting solutions that provide continuous access to information in the areas of fraud detection, catastrophe modeling, loss estimation, and underwriting. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. The Company recognizes revenue ratably over the term of these annual agreements under the series guidance, as services are performed and continuous access to information is provided over the entire term of the agreements. There are also services within insurance, which are comprised of transaction-based fees for which revenue is recognized as information is delivered to customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for those services. Energy and Specialized Markets Revenue The Company licenses hosting solutions that provide continuous access to research information such as data analytics and commercial intelligence for the energy, chemicals, metals and mining verticals. These arrangements include a series of distinct services that have the same pattern of transfer to the customer. The Company recognizes revenue ratably over the term of these annual agreements. Furthermore, the Company performs certain discrete project based services; in these instances, revenue is recognized as control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for these services. Financial Services Revenue Financial services provide competitive benchmarking, scoring solutions, analytics, and customized service to financial services institutions. The Company primarily recognizes revenue ratably for these services over the term of the agreements, as services are performed and continuous service is provided over the entire term of the agreements. In addition, the Company performs certain discrete project based services that are unrelated and independent of the aforementioned continuous services; in these instances, revenue is recognized as control of the promised services is transferred to our customers, in an amount that reflects the consideration that the Company expects to be entitled to in exchange for these services. Practical Expedient and Exemption The Company generally recognizes revenues, provided that all other revenue recognition criteria are met, and related costs when incurred in accordance with Topic 606 because the period of recognition would have been one year or less. These costs are recorded within “Cost of revenues” and “Selling, general and administrative” expenses in the condensed consolidated statements of operations. Accounts Receivables and Allowance for Doubtful Accounts Accounts receivables is generally recorded at the invoiced amount. The allowance for doubtful accounts is estimated based on an analysis of the aging of the accounts receivable, historical write-offs, customer payment patterns, individual customer credit worthiness, current economic trends, and/or establishment of specific reserves for customers in adverse financial condition. The Company assesses the adequacy of the allowance for doubtful accounts on a quarterly basis. Deferred Commissions The incremental costs of obtaining a contract with a customer, which primarily consists of sales commissions, are deferred and amortized over a useful life of 5 years that is consistent with the transfer to the customer the services to which the asset relates. The Company classifies deferred commissions as current or noncurrent based on the timing of expense recognition. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other assets, respectively, in the condensed consolidated balance sheets as of June 30, 2018 . Amortization expense related to deferred commissions is computed on a straight-line basis over its estimated useful lives and included in the condensed consolidated statements of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases ("ASU No. 2016-02"). This ASU amends the existing accounting considerations and treatments for leases through the creation of Topic 842, Leases , to increase transparency and comparability among organizations by requiring the recognition of lease assets and lease liabilities on the balance sheet and the disclosure of key information about lease arrangements. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from such leases. The Company established a corporate implementation team, which engages with cross-functional representatives from all of its business verticals. The Company is utilizing a bottom-up approach to analyze the impact of the standard on its lease contract portfolio by reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to lease arrangements. In addition, the Company is in the process of identifying and/or implementing the appropriate changes to its business processes, systems and controls to support recognition and disclosure under the new standard. The amendments in ASU No. 2016-02 are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and allows for modified retrospective adoption with early adoption permitted. The Company has decided not to early adopt the amendments. The Company is also assessing the impact associated with the adoption of ASU No. 2016-02 on the condensed consolidated balance sheet, which is expected to be material based upon review of the future contractual obligations.
Segment Reporting	ASC 280-10, Disclosures About Segments of an Enterprise and Related Information (“ASC 280-10”), establishes standards for reporting information about operating segments. ASC 280-10 requires that a public business enterprise reports financial and descriptive information about its operating segments. Operating segments are components of an enterprise for which separate financial information is available that is evaluated regularly by the CODM in deciding how to allocate resources and in assessing performance. The Company’s President and CEO is identified as the CODM as defined by ASC 280-10.
Related Party Disclosures	The Company considers its stockholders that own more than 5.0% of the outstanding common stock to be related parties as defined within ASC 850, Related Party Disclosures . As of June 30, 2018 and December 31, 2017 , the Company had no material transactions with related parties.

Revenues (Tables)

Revenues (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table shows cumulative effect of the changes made to the January 1, 2018 condensed consolidated balance sheet for the adoption of Topic 606 related to contracts that were entered into prior to and remained in progress subsequent to the adoption: December 31, 2017 Adjustments due to Topic 606 January 1, 2018 Accounts receivable $ 345.5 $ 3.0 (1) $ 348.5 Prepaid expenses $ 38.1 $ 14.9 (2) $ 53.0 Other assets $ 214.5 $ 27.0 (2) $ 241.5 Deferred revenues $ 384.7 $ (1.5 ) $ 383.2 Deferred income tax liabilities $ 337.8 $ 11.2 $ 349.0 Retained earnings $ 3,308.0 $ 35.2 $ 3,343.2 _______________ (1) Relates to unbilled receivables (2) Relates to deferred commissions current and non-current, respectively In accordance with Topic 606, the disclosure of the impact of adoption on the unaudited condensed consolidated statement of operations and the condensed consolidated balance sheet for and as of the three and six months ended June 30, 2018 are as follows: Three months ended June 30, 2018 under Topic 605 Adjustments due to Topic 606 Three months ended June 30, 2018 under Topic 606 Revenues $ 601.3 $ — $ 601.3 Selling, general and administrative $ 94.9 $ (1.9 ) $ 93.0 Provision for income taxes $ (31.0 ) $ (0.5 ) $ (31.5 ) Net income $ 152.1 $ 1.4 $ 153.5 Six months ended June 30, 2018 under Topic 605 Adjustments due to Topic 606 Six months ended June 30, 2018 under Topic 606 Revenues $ 1,182.1 $ 0.4 $ 1,182.5 Selling, general and administrative $ 187.8 $ (2.9 ) $ 184.9 Provision for income taxes $ (60.0 ) $ (0.8 ) $ (60.8 ) Net income $ 284.0 $ 2.5 $ 286.5 As of June 30, 2018 under Topic 605 Adjustments due to Topic 606 As of June 30, 2018 under Topic 606 Accounts receivable $ 343.1 $ 4.7 $ 347.8 Prepaid expenses $ 45.2 $ 15.9 $ 61.1 Other assets $ 204.7 $ 30.0 $ 234.7 Accounts payable and accrued liabilities $ 215.3 $ 1.1 $ 216.4 Deferred revenues $ 513.2 $ (0.2 ) $ 513.0 Deferred income tax liabilities $ 337.6 $ 12.0 $ 349.6 Retained earnings $ 3,592.7 $ 37.7 $ 3,630.4
Disaggregation of Revenue	Disaggregated revenues by type of service and by country are provided below for the three and six months ended June 30, 2018 and 2017 . No individual country outside of the U.S. accounted for 10.0% or more of the Company's consolidated revenues for the three and six months ended June 30, 2018 or 2017 . Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Insurance: Underwriting & rating $ 288.9 $ 262.0 $ 569.6 $ 515.2 Claims 140.5 120.4 272.5 234.1 Total Insurance 429.4 382.4 842.1 749.3 Energy and Specialized Markets 129.9 110.3 255.4 216.6 Financial Services 42.0 30.5 85.0 59.9 Total revenues $ 601.3 $ 523.2 $ 1,182.5 $ 1,025.8 Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Revenues: U.S. $ 460.4 $ 409.0 $ 909.9 $ 805.0 U.K. 36.0 26.1 71.0 49.8 Other countries 104.9 88.1 201.6 171.0 Total revenues $ 601.3 $ 523.2 $ 1,182.5 $ 1,025.8

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Accounted at Fair Value	The following table summarizes fair value measurements by level for registered investment companies that were measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level 1) June 30, 2018 Registered investment companies (1) $ 3.8 December 31, 2017 Registered investment companies (1) $ 3.8 _______________ (1) Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned.
Summary of Carrying Value and Estimated Fair Value of Long-Term Debt	The following table summarizes the carrying value and estimated fair value of these financial instruments as of June 30, 2018 and December 31, 2017 , respectively: 2018 2017 Fair Value Hierarchy Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial instruments not carried at fair value: Subordinated promissory note receivable Level 2 $ 106.2 $ 111.0 $ 95.3 $ 83.3 Long-term debt excluding capitalized Level 2 $ 2,282.3 $ 2,335.0 $ 2,280.6 $ 2,439.8

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The preliminary purchase price allocations of the 2018 acquisitions resulted in the following: Validus Others Total Cash and cash equivalents $ 0.9 $ 2.2 $ 3.1 Accounts receivable 1.3 1.1 2.4 Current assets 6.2 0.3 6.5 Fixed assets 0.5 0.2 0.7 Intangible assets 20.7 8.3 29.0 Goodwill 25.3 15.8 41.1 Other assets — 0.4 0.4 Total assets acquired 54.9 28.3 83.2 Current liabilities 4.1 1.0 5.1 Deferred revenues 0.1 1.1 1.2 Deferred income taxes, net 3.5 1.6 5.1 Other liabilities 0.2 1.3 1.5 Total liabilities assumed 7.9 5.0 12.9 Net assets acquired 47.0 23.3 70.3 Cash acquired (0.9 ) (2.2 ) (3.1 ) Net cash purchase price $ 46.1 $ 21.1 $ 67.2
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	The preliminary amounts assigned to intangible assets by type for the 2018 acquisitions are summarized in the table below: Weighted Average Useful Life Total Technology-related 6 years $ 12.6 Marketing-related 8 years 1.1 Customer-related 10 years 15.3 Total intangible assets $ 29.0

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Change in Goodwill	The following is a summary of the change in goodwill from December 31, 2017 through June 30, 2018 , both in total and as allocated to the Company’s operating segments: Insurance Energy and Specialized Markets Financial Services Total Goodwill, net at December 31, 2017 (1) $ 749.5 $ 2,149.6 $ 469.6 $ 3,368.7 Current period acquisitions 38.3 — 2.8 41.1 Purchase accounting reclassification 4.7 (1.9 ) 2.7 5.5 Foreign currency translation (7.3 ) (34.3 ) (1.0 ) (42.6 ) Goodwill, net at June 30, 2018 (1) $ 785.2 $ 2,113.4 $ 474.1 $ 3,372.7 _______________ (1) These balances are net of accumulated impairment charges of $3.2 million that occurred prior to December 31, 2017 .
Intangible Assets and Related Accumulated Amortization	The Company’s intangible assets and related accumulated amortization consisted of the following: Weighted Average Useful Life Cost Accumulated Amortization Net June 30, 2018 Technology-based 8 years $ 429.8 $ (239.2 ) $ 190.6 Marketing-related 16 years 260.4 (70.4 ) 190.0 Contract-based 6 years 5.0 (5.0 ) — Customer-related 14 years 711.9 (199.2 ) 512.7 Database-related 19 years 465.6 (69.4 ) 396.2 Total intangible assets $ 1,872.7 $ (583.2 ) $ 1,289.5 December 31, 2017 Technology-based 8 years $ 421.0 $ (222.9 ) $ 198.1 Marketing-related 17 years 263.9 (62.9 ) 201.0 Contract-based 6 years 5.0 (5.0 ) — Customer-related 14 years 704.2 (174.0 ) 530.2 Database-related 19 years 474.7 (58.7 ) 416.0 Total intangible assets $ 1,868.8 $ (523.5 ) $ 1,345.3
Estimated Amortization Expense	Estimated amortization expense for the remainder of 2018 and the years through 2023 and thereafter for intangible assets subject to amortization is as follows: Year Amount 2018 $ 64.9 2019 129.2 2020 127.2 2021 116.7 2022 105.4 2023 and thereafter 746.1 $ 1,289.5

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Short-Term and Long-Term Debt	The following table presents short-term and long-term debt by issuance as of June 30, 2018 and December 31, 2017 : Issuance Date Maturity Date 2018 2017 Short-term debt and current portion of long-term debt: Syndicated revolving credit facility Various Various $ 480.0 $ 715.0 Capital lease obligations Various Various 7.2 9.4 4.875% senior notes, less unamortized discount 12/8/2011 1/15/2019 249.7 — Short-term debt and current portion of long-term 736.9 724.4 Long-term debt: Senior notes: 4.000% senior notes, less unamortized discount 5/15/2015 6/15/2025 891.5 890.9 5.500% senior notes, less unamortized discount 5/15/2015 6/15/2045 345.2 345.1 4.125% senior notes, less unamortized discount 9/12/2012 9/12/2022 347.4 347.1 4.875% senior notes, less unamortized discount 12/8/2011 1/15/2019 — 249.3 5.800% senior notes, less unamortized discount 4/6/2011 5/1/2021 448.5 448.2 Capital lease obligations Various Various 15.0 7.6 Syndicated revolving credit facility debt issuance Various Various (3.4 ) (3.8 ) Long-term debt 2,044.2 2,284.4 Total debt $ 2,781.1 $ 3,008.8

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following is a presentation of the numerators and denominators of the basic and diluted EPS computations for the three and six months ended June 30, 2018 and 2017 : Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator used in basic and diluted EPS: Net income $ 153.5 $ 121.0 $ 286.5 $ 229.8 Denominator: Weighted average number of common shares used 165,015,642 164,922,237 165,029,345 165,682,614 Effect of dilutive shares: Potential common shares issuable from stock 3,635,560 3,392,059 3,792,524 3,549,965 Weighted average number of common shares 168,651,202 168,314,296 168,821,869 169,232,579
Summary of Accumulated Other Comprehensive Losses	The following is a summary of accumulated other comprehensive losses as of June 30, 2018 and December 31, 2017 : 2018 2017 Foreign currency translation adjustment $ (397.3 ) $ (334.4 ) Unrealized holding gains on available-for-sale securities, net of tax — (1) 0.7 Pension and postretirement adjustment, net of tax (76.9 ) (78.6 ) Accumulated other comprehensive losses $ (474.2 ) $ (412.3 ) _______________ (1) Includes an adjustment of $0.7 million to opening retained earnings related to adoption of ASU 2016-01 at January 1, 2018
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)	The before tax and after tax amounts of other comprehensive income for the three and six months ended June 30, 2018 and 2017 are summarized below: Before Tax Tax (Expense) Benefit After Tax For the Three Months Ended June 30, 2018 Foreign currency translation adjustment $ (165.6 ) $ — $ (165.6 ) Pension and postretirement adjustment before reclassifications 1.6 (0.2 ) 1.4 Amortization of net actuarial loss and prior service benefit (1) (0.9 ) 0.2 (0.7 ) Pension and postretirement adjustment 0.7 — 0.7 Total other comprehensive loss $ (164.9 ) $ — $ (164.9 ) For the Three Months Ended June 30, 2017 Foreign currency translation adjustment $ 89.6 $ — $ 89.6 Unrealized holding gain on available-for-sale securities before (1) 0.1 — 0.1 Unrealized holding gain on available-for-sale securities 0.1 — 0.1 Pension and postretirement adjustment before reclassifications 2.7 (1.1 ) 1.6 Amortization of net actuarial loss and prior service benefit (1) (1.3 ) 0.5 (0.8 ) Pension and postretirement adjustment 1.4 (0.6 ) 0.8 Total other comprehensive gain $ 91.1 $ (0.6 ) $ 90.5 Before Tax Tax (Expense) Benefit After Tax For the Six Months Ended June 30, 2018 Foreign currency translation adjustment $ (62.9 ) $ — $ (62.9 ) Pension and postretirement adjustment before reclassifications 3.7 (0.7 ) 3.0 Amortization of net actuarial loss and prior service benefit (1) (1.8 ) 0.5 (1.3 ) Pension and postretirement adjustment 1.9 (0.2 ) 1.7 Total other comprehensive loss $ (61.0 ) $ (0.2 ) $ (61.2 ) For the Six Months Ended June 30, 2017 Foreign currency translation adjustment $ 122.7 $ — $ 122.7 Unrealized holding gain on available-for-sale securities before 0.3 (0.1 ) 0.2 Unrealized holding gain on available-for-sale securities 0.3 (0.1 ) 0.2 Pension and postretirement adjustment before reclassifications 5.0 (2.0 ) 3.0 Amortization of net actuarial loss and prior service benefit (1) (2.5 ) 1.0 (1.5 ) Pension and postretirement adjustment 2.5 (1.0 ) 1.5 Total other comprehensive gain $ 125.5 $ (1.1 ) $ 124.4 _______________ (1) These accumulated other comprehensive loss components, before tax, are included under “Cost of revenues” and “Selling, general and administrative” in the accompanying condensed consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (see Note 12 Pension and Postretirement Benefits for additional details).

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Other Share-based Compensation, Activity	A summary of the equity awards granted for the six months ended June 30, 2018 is presented below. Grant Date Service Vesting Period Stock Options Restricted Stock Performance Share Units January 1 to June 30, 2018 Four-year graded vesting 944 194 — April 1, 2018 Four-year graded vesting 873,383 187,462 — April 1, 2018 Three-year cliff vesting — — 46,705 April 16, 2018 Four-year graded vesting 11,491 2,338 — 885,818 189,994 46,705
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of the stock options granted for the six months ended June 30, 2018 and 2017 was estimated using a Black-Scholes valuation model that uses the weighted average assumptions noted in the following table: 2018 2017 Option pricing model Black-Scholes Black-Scholes Expected volatility 18.52 % 18.71 % Risk-free interest rate 2.51 % 1.82 % Expected term in years 4.4 4.5 Dividend yield — % — % Weighted average grant date fair value per stock option $ 21.23 $ 15.64
Summary of Stock Options Outstanding	A summary of the stock options outstanding and exercisable as of December 31, 2017 and June 30, 2018 and changes during the interim period are presented below: Number Weighted Aggregate Outstanding at December 31, 2017 8,907,109 $ 53.31 $ 380.2 Granted 885,818 $ 104.04 Exercised (1,369,268 ) $ 36.70 $ 92.9 Cancelled or expired (222,517 ) $ 77.11 Outstanding at June 30, 2018 8,201,142 $ 60.92 $ 383.2 Exercisable at June 30, 2018 5,685,763 $ 49.06 $ 333.1 Exercisable at December 31, 2017 5,995,339 $ 41.50 $ 326.8
Summary of Restricted Stock Awards	A summary of the status of the restricted stock and performance share units awarded under the 2013 Incentive Plan as of December 31, 2017 and June 30, 2018 and changes during the interim period are presented below: Number Weighted Average Grant Outstanding at December 31, 2017 604,464 $ 78.28 Granted 236,699 $ 111.27 Vested (205,731 ) $ 75.09 Forfeited (44,246 ) $ 87.66 Outstanding at June 30, 2018 591,186 $ 91.87

Pension and Postretirement Be33

Pension and Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Components of Net Periodic (Benefit) Cost	The components of net periodic (benefit) cost for the three and six months ended June 30, are summarized below: Pension Plan and SERP Postretirement Plan For the Three Months Ended June 30, 2018 2017 2018 2017 Interest cost $ 4.0 $ 4.4 $ 0.1 $ 0.1 Expected return on plan assets (8.7 ) (7.7 ) — (0.1 ) Amortization of prior service credit 0.1 — (0.1 ) — Amortization of net actuarial loss 0.8 1.2 0.1 0.1 Net periodic (benefit) cost $ (3.8 ) $ (2.1 ) $ 0.1 $ 0.1 Employer contributions, net $ 0.3 $ 0.3 $ (0.2 ) $ 0.2 Pension Plan and SERP Postretirement Plan For the Six Months Ended June 30, 2018 2017 2018 2017 Interest cost $ 7.6 $ 8.6 $ 0.2 $ 0.2 Expected return on plan assets (16.4 ) (15.5 ) (0.1 ) (0.2 ) Amortization of prior service cost 0.1 0.1 (0.1 ) — Amortization of net actuarial loss 1.6 2.2 0.2 0.2 Net periodic (benefit) cost $ (7.1 ) $ (4.6 ) $ 0.2 $ 0.2 Employer contributions, net $ 0.5 $ 0.5 $ (0.3 ) $ 0.6

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Reconciliations To Income Before Income Taxes	The following table provides the Company’s revenue and EBITDA by reportable segment for the three and six months ended June 30, 2018 and 2017 , and the reconciliation of EBITDA to operating income as shown in the accompanying condensed consolidated statements of operations: For the Three Months Ended June 30, 2018 June 30, 2017 Insurance Energy and Specialized Markets Financial Services Total Insurance Energy and Specialized Markets Financial Services Total Revenues $ 429.4 $ 129.9 $ 42.0 $ 601.3 $ 382.4 $ 110.3 $ 30.5 $ 523.2 Expenses: Cost of revenues (141.6 ) (56.3 ) (24.5 ) (222.4 ) (125.9 ) (48.8 ) (19.0 ) (193.7 ) Selling, general and (53.3 ) (34.9 ) (4.8 ) (93.0 ) (49.1 ) (27.7 ) (2.0 ) (78.8 ) Investment income and 1.8 2.5 0.3 4.6 3.0 0.3 0.1 3.4 EBITDA 236.3 41.2 13.0 290.5 210.4 34.1 9.6 254.1 Depreciation and (25.0 ) (11.0 ) (5.6 ) (41.6 ) (21.8 ) (8.5 ) (1.5 ) (31.8 ) Amortization of (5.4 ) (21.2 ) (5.4 ) (32.0 ) (2.9 ) (17.4 ) (3.6 ) (23.9 ) Less: Investment income (1.8 ) (2.5 ) (0.3 ) (4.6 ) (3.0 ) (0.3 ) (0.1 ) (3.4 ) Operating income $ 204.1 $ 6.5 $ 1.7 212.3 $ 182.7 $ 7.9 $ 4.4 195.0 Investment income and others, 4.6 3.4 Interest expense (31.9 ) (28.5 ) Income before income $ 185.0 $ 169.9 For the Six Months Ended June 30, 2018 June 30, 2017 Insurance Energy and Specialized Markets Financial Services Total Insurance Energy and Specialized Markets Financial Services Total Revenues $ 842.1 $ 255.4 $ 85.0 $ 1,182.5 $ 749.3 $ 216.6 $ 59.9 $ 1,025.8 Expenses: Cost of revenues (280.2 ) (112.0 ) (51.4 ) (443.6 ) (246.1 ) (94.5 ) (36.0 ) (376.6 ) Selling, general and (105.9 ) (69.0 ) (10.0 ) (184.9 ) (94.5 ) (55.8 ) (4.4 ) (154.7 ) Investment income and 4.3 0.4 0.6 5.3 5.6 (0.5 ) 0.2 5.3 EBITDA 460.3 74.8 24.2 559.3 414.3 65.8 19.7 499.8 Depreciation and (52.3 ) (22.0 ) (7.7 ) (82.0 ) (45.4 ) (17.0 ) (3.2 ) (65.6 ) Amortization of (10.9 ) (42.8 ) (11.5 ) (65.2 ) (5.0 ) (34.3 ) (6.9 ) (46.2 ) Less: Investment income (4.3 ) (0.4 ) (0.6 ) (5.3 ) (5.6 ) 0.5 (0.2 ) (5.3 ) Operating income $ 392.8 $ 9.6 $ 4.4 406.8 $ 358.3 $ 15.0 $ 9.4 382.7 Investment income and others, 5.3 5.3 Interest expense (64.8 ) (56.9 ) Income before income $ 347.3 $ 331.1
Long-lived Assets by Geographic Areas	Long-lived assets by country are provided below: June 30, 2018 December 31, 2017 Long-lived assets: U.S $ 2,461.9 $ 2,438.6 U.K. 2,627.9 2,656.6 Other countries 324.7 327.5 Total long-lived assets $ 5,414.5 $ 5,422.7

Basis of Presentation and Sum35

Basis of Presentation and Summary of Significant Accounting Policies (Details) - segment	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of operating segments	3	2
Deferred commissions, useful life	5 years
Subscriptions
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of service contract	1 year
Minimum | Long Term Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of service contract	3 years
Maximum | Long Term Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of service contract	5 years

Revenues - Cumulative Effect (D

Revenues - Cumulative Effect (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable	$ 347.8		$ 347.8		$ 345.5	$ 348.5
Prepaid expenses	61.1		61.1		38.1	53
Other assets	234.7		234.7		214.5	241.5
Accounts payable and accrued liabilities	216.4		216.4		225.4
Deferred revenues	513		513		384.7	383.2
Deferred income tax liabilities	349.6		349.6		337.8	349
Retained earnings	3,630.4		3,630.4		3,308	3,343.2
Revenues	601.3	$ 523.2	1,182.5	$ 1,025.8
Selling, general and administrative	93	78.8	184.9	154.7
Provision for income taxes	(31.5)	(48.9)	(60.8)	(101.3)
Net income	153.5	$ 121	286.5	$ 229.8	555.1
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable	343.1		343.1		345.5
Prepaid expenses	45.2		45.2		38.1
Other assets	204.7		204.7		214.5
Accounts payable and accrued liabilities	215.3		215.3
Deferred revenues	513.2		513.2		384.7
Deferred income tax liabilities	337.6		337.6		337.8
Retained earnings	3,592.7		3,592.7		$ 3,308
Revenues	601.3		1,182.1
Selling, general and administrative	94.9		187.8
Provision for income taxes	(31)		(60)
Net income	152.1		284
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable	4.7		4.7			3
Prepaid expenses	15.9		15.9			14.9
Other assets	30		30			27
Accounts payable and accrued liabilities	1.1		1.1
Deferred revenues	(0.2)		(0.2)			(1.5)
Deferred income tax liabilities	12		12			11.2
Retained earnings	37.7		37.7			$ 35.2
Revenues	0		0.4
Selling, general and administrative	(1.9)		(2.9)
Provision for income taxes	(0.5)		(0.8)
Net income	$ 1.4		$ 2.5

Revenues - Disaggregated Revenu

Revenues - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 601.3	$ 523.2	$ 1,182.5	$ 1,025.8
U.S.
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	460.4	409	909.9	805
U.K.
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	36	26.1	71	49.8
Other countries
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	104.9	88.1	201.6	171
Insurance
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	429.4	382.4	842.1	749.3
Insurance | Underwriting & rating
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	288.9	262	569.6	515.2
Insurance | Claims
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	140.5	120.4	272.5	234.1
Energy and Specialized Markets
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	129.9	110.3	255.4	216.6
Financial Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 42	$ 30.5	$ 85	$ 59.9

Revenues - (Details)

Revenues - (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 515.6
Revenue, remaining performance obligation, current, percentage	98.00%
Revenue, remaining performance obligation, non-current, percentage	2.00%

Contract Assets and Contract 39

Contract Assets and Contract Liabilities - (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract with customer, asset	$ 0	$ 0
Contract with customer, liability	515,600,000	$ 386,700,000
Increase in contract liabilities	128,900,000
Billings paid in advance	376,200,000
Revenue recognized	$ 246,800,000

Fair Value Measurements - Fina

Fair Value Measurements - Financial Assets and Liabilities Accounted at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Registered investment companies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Registered investment companies	$ 3.8	$ 3.8

Fair Value Measurements - Summ

Fair Value Measurements - Summary of Carrying Value and Estimated Fair Value of Long-Term Debt (Details) - Level 2 - Recurring basis - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated promissory note receivable, carrying value	$ 106.2	$ 95.3
Subordinated promissory note receivable, estimated fair value	111	83.3
Long-term debt excluding capital leases and credit facility, carrying value	2,282.3	2,280.6
Long-term debt excluding capital leases and credit facility, estimated fair value	$ 2,335	$ 2,439.8

Fair Value Measurements - (Deta

Fair Value Measurements - (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subordinated debt	$ 100
Debt instrument, term (in years)	8 years
Non-participating interests, percentage	10.00%
Equity method investments	$ 8.4
Limited Partner
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity method investments	$ 7.1

Acquisitions - Additional Info

Acquisitions - Additional Information (Details) - USD ($)	Jun. 20, 2018	Feb. 21, 2018	Jan. 05, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Transaction costs				$ 500,000	$ 1,400,000	$ 1,200,000	$ 2,700,000
Non tax deductible, goodwill				41,100,000		41,100,000
Current portion of escrow				44,900,000		44,900,000		$ 22,900,000
Escrow deposit				0		0		$ 26,300,000
Validus
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Consideration transferred	$ 46,100,000
Contingent escrow	5,900,000
Liabilities and goodwill	$ 3,100,000
Business Insight
Business Acquisition [Line Items]
Percentage of voting interests acquired		100.00%
Consideration transferred		$ 17,100,000
Holdback amount		$ 900,000
Marketview
Business Acquisition [Line Items]
Percentage of voting interests acquired			100.00%
Consideration transferred			$ 4,000,000
Indemnification escrow			$ 400,000
PowerAdvocate
Business Acquisition [Line Items]
Liabilities and goodwill				34,200,000		34,200,000
Accounts Payable and Accrued Liabilities
Business Acquisition [Line Items]
Contingent consideration, payable				7,500,000		7,500,000
Other Liabilities
Business Acquisition [Line Items]
Contingent consideration, payable				$ 29,800,000		$ 29,800,000

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Cash and cash equivalents	$ 3.1
Accounts receivable	2.4
Current assets	6.5
Fixed assets	0.7
Intangible assets	29
Goodwill	41.1
Other assets	0.4
Total assets acquired	83.2
Current liabilities	5.1
Deferred revenues	1.2
Deferred income taxes, net	5.1
Other liabilities	1.5
Total liabilities assumed	12.9
Net assets acquired	70.3
Cash acquired	(3.1)	$ (4)
Net cash purchase price	67.2
Validus
Business Acquisition [Line Items]
Cash and cash equivalents	0.9
Accounts receivable	1.3
Current assets	6.2
Fixed assets	0.5
Intangible assets	20.7
Goodwill	25.3
Other assets	0
Total assets acquired	54.9
Current liabilities	4.1
Deferred revenues	0.1
Deferred income taxes, net	3.5
Other liabilities	0.2
Total liabilities assumed	7.9
Net assets acquired	47
Cash acquired	(0.9)
Net cash purchase price	46.1
Others
Business Acquisition [Line Items]
Cash and cash equivalents	2.2
Accounts receivable	1.1
Current assets	0.3
Fixed assets	0.2
Intangible assets	8.3
Goodwill	15.8
Other assets	0.4
Total assets acquired	28.3
Current liabilities	1
Deferred revenues	1.1
Deferred income taxes, net	1.6
Other liabilities	1.3
Total liabilities assumed	5
Net assets acquired	23.3
Cash acquired	(2.2)
Net cash purchase price	$ 21.1

Acquisitions - Intangible Asse

Acquisitions - Intangible Assets Acquired (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 29
Technology-related
Business Acquisition [Line Items]
Weighted average useful life (in years)	6 years
Finite-lived intangible assets acquired	$ 12.6
Marketing-related
Business Acquisition [Line Items]
Weighted average useful life (in years)	8 years
Finite-lived intangible assets acquired	$ 1.1
Customer-related
Business Acquisition [Line Items]
Weighted average useful life (in years)	10 years
Finite-lived intangible assets acquired	$ 15.3

Goodwill and Intangible Asset46

Goodwill and Intangible Assets - Summary of Change in Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, ending balance	$ 41.1
Accumulated impairment loss		$ 3.2
Operating Segments
Goodwill [Roll Forward]
Goodwill, beginning balance	3,368.7
Current period acquisitions	41.1
Purchase accounting reclassification	5.5
Foreign currency translation	(42.6)
Goodwill, ending balance	3,372.7
Operating Segments | Insurance
Goodwill [Roll Forward]
Goodwill, beginning balance	749.5
Current period acquisitions	38.3
Purchase accounting reclassification	4.7
Foreign currency translation	(7.3)
Goodwill, ending balance	785.2
Operating Segments | Energy and Specialized Markets
Goodwill [Roll Forward]
Goodwill, beginning balance	2,149.6
Current period acquisitions	0
Purchase accounting reclassification	(1.9)
Foreign currency translation	(34.3)
Goodwill, ending balance	2,113.4
Operating Segments | Financial Services
Goodwill [Roll Forward]
Goodwill, beginning balance	469.6
Current period acquisitions	2.8
Purchase accounting reclassification	2.7
Foreign currency translation	(1)
Goodwill, ending balance	$ 474.1

Goodwill and Intangible Asset47

Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, impairment loss			$ 0
Amortization of intangible assets	$ 32,000,000	$ 23,900,000	$ 65,200,000	$ 46,200,000

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,872.7	$ 1,868.8
Accumulated Amortization	(583.2)	(523.5)
Net	$ 1,289.5	$ 1,345.3
Technology-based
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	8 years	8 years
Cost	$ 429.8	$ 421
Accumulated Amortization	(239.2)	(222.9)
Net	$ 190.6	$ 198.1
Marketing-related
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	16 years	17 years
Cost	$ 260.4	$ 263.9
Accumulated Amortization	(70.4)	(62.9)
Net	$ 190	$ 201
Contract-based
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	6 years	6 years
Cost	$ 5	$ 5
Accumulated Amortization	(5)	(5)
Net	$ 0	$ 0
Customer-related
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	14 years	14 years
Cost	$ 711.9	$ 704.2
Accumulated Amortization	(199.2)	(174)
Net	$ 512.7	$ 530.2
Database-related
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	19 years	19 years
Cost	$ 465.6	$ 474.7
Accumulated Amortization	(69.4)	(58.7)
Net	$ 396.2	$ 416

Goodwill and Intangible Asset49

Goodwill and Intangible Assets - Estimated Amortization Expense (Details) $ in Millions	Jun. 30, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 64.9
2,019	129.2
2,020	127.2
2,021	116.7
2,022	105.4
2023 and thereafter	746.1
Total	$ 1,289.5

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	17.03%	28.80%	17.50%	30.59%

Debt - Short-Term and Long-Ter

Debt - Short-Term and Long-Term Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 736.9	$ 724.4
Capital lease obligations	15	7.6
Syndicated revolving credit facility debt issuance costs	(3.4)	(3.8)
Long-term debt	2,044.2	2,284.4
Total debt	$ 2,781.1	3,008.8
4.875% Senior Note
Debt Instrument [Line Items]
Debt issuance date	Dec. 8, 2011
Debt maturity date	Jan. 15, 2019
Short-term debt	$ 249.7	0
Long-term debt	$ 0	$ 249.3
Long term debt instrument interest rate stated percentage	4.875%	4.875%
Unamortized discount on senior notes	$ 0.3	$ 0.7
4.000% Senior Note
Debt Instrument [Line Items]
Debt issuance date	May 15, 2015
Debt maturity date	Jun. 15, 2025
Long-term debt	$ 891.5	$ 890.9
Long term debt instrument interest rate stated percentage	4.00%	4.00%
Unamortized discount on senior notes	$ 8.5	$ 9.1
5.500% Senior Note
Debt Instrument [Line Items]
Debt issuance date	May 15, 2015
Debt maturity date	Jun. 15, 2045
Long-term debt	$ 345.2	$ 345.1
Long term debt instrument interest rate stated percentage	5.50%	5.50%
Unamortized discount on senior notes	$ 4.8	$ 4.9
4.125% Senior Note
Debt Instrument [Line Items]
Debt issuance date	Sep. 12, 2012
Debt maturity date	Sep. 12, 2022
Long-term debt	$ 347.4	$ 347.1
Long term debt instrument interest rate stated percentage	4.125%	4.125%
Unamortized discount on senior notes	$ 2.6	$ 2.9
5.800% Senior Note
Debt Instrument [Line Items]
Debt issuance date	Apr. 6, 2011
Debt maturity date	May 1, 2021
Long-term debt	$ 448.5	$ 448.2
Long term debt instrument interest rate stated percentage	5.80%	5.80%
Unamortized discount on senior notes	$ 1.5	$ 1.8
Line of Credit
Debt Instrument [Line Items]
Syndicated revolving credit facility	480	715
Capital lease obligations
Debt Instrument [Line Items]
Capital lease obligations	$ 7.2	$ 9.4

Debt - Additional Information

Debt - Additional Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,300,000,000	$ 2,300,000,000
Line of Credit
Debt Instrument [Line Items]
Syndicated revolving credit facility	480,000,000	$ 715,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,500,000,000
Proceeds from lines of credit	50,000,000
Repayments of debt	$ 95,000,000

Stockholders' Equity - Additio

Stockholders' Equity - Additional Information (Details)	Jul. 02, 2018USD ($)$ / sharesshares	Jun. 15, 2018USD ($)	Jun. 30, 2018USD ($)director$ / sharesshares	Jun. 30, 2017shares	Jun. 30, 2018USD ($)director$ / sharesshares	Jun. 30, 2017shares	Dec. 31, 2017USD ($)shares	May 16, 2018USD ($)
Class of Stock [Line Items]
Number of company directors | director			12		12
Preferred stock, authorized (in shares) | shares			80,000,000		80,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001
Cumulative value of shares repurchased			$ 2,614,200,000		$ 2,614,200,000
Treasury stock, shares acquired (in shares) | shares					1,711,166		3,356,360
Treasury stock acquired					$ 180,400,000		$ 269,800,000
Accelerated share repurchases, purchase price		$ 50,000,000
Treasury stock (in shares) | shares			379,278,995		379,278,995		379,124,108
Reissued of common stock (in shares) | shares					1,556,279
Weighted average price per share (in dollars per share) | $ / shares			$ 8.47		$ 8.47
Common stock shares excluded from diluted EPS (in shares) | shares			906,866	2,722,518	455,292	2,002,341
Common Stock Issued
Class of Stock [Line Items]
Share repurchase program, authorized capacity			$ 3,300,000,000		$ 3,300,000,000			$ 500,000,000
Available shares for repurchase			$ 685,800,000		685,800,000
Treasury Stock
Class of Stock [Line Items]
Treasury stock acquired					$ 180,400,000		$ 269,800,000
Subsequent Event
Class of Stock [Line Items]
Accelerated share repurchases, purchase price	$ 40,000,000
Accelerated share repurchases, initial price, shares (in shares) | shares	371,609
Accelerated share repurchases, initial price paid per share (in dollars per share) | $ / shares	$ 107.64
Subsequent Event | Treasury Stock
Class of Stock [Line Items]
Accelerated share repurchases, purchase price	$ 40,000,000
Subsequent Event | Additional Paid-in Capital
Class of Stock [Line Items]
Accelerated share repurchases, purchase price	$ 10,000,000

Stockholders' Equity - Computa

Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Numerator used in basic and diluted EPS:
Net income	$ 153.5	$ 121	$ 286.5	$ 229.8	$ 555.1
Denominator:
Weighted average number of common shares used in basic EPS (in shares)	165,015,642	164,922,237	165,029,345	165,682,614
Effect of dilutive shares:
Potential common shares issuable from stock options and stock awards (in shares)	3,635,560	3,392,059	3,792,524	3,549,965
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares)	168,651,202	168,314,296	168,821,869	169,232,579

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment	$ (397.3)		$ (334.4)
Unrealized holding gains on available-for-sale securities, net of tax	0		0.7
Pension and postretirement adjustment, net of tax	(76.9)		(78.6)
Accumulated other comprehensive losses	$ (474.2)		(412.3)
Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of new accounting principle in period of adoption			35.2
Retained Earnings | Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ 0.7	$ 35.9

Stockholders' Equity - Before

Stockholders' Equity - Before Tax and After Tax Amounts of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Before Tax
Foreign currency translation adjustment	$ (165.6)	$ 89.6	$ (62.9)	$ 122.7
Available-for-sale securities adjustment		0.1		0.3
Unrealized holding gain on available-for-sale securities		0.1		0.3
Pension and postretirement adjustment before reclassifications	1.6	2.7	3.7	5
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	(0.9)	(1.3)	(1.8)	(2.5)
Pension and postretirement adjustment	0.7	1.4	1.9	2.5
Total other comprehensive loss	(164.9)	91.1	(61)	125.5
Tax (Expense) Benefit
Foreign currency translation adjustment	0	0	0	0
Available-for-sale securities adjustment		0		(0.1)
Unrealized holding gain on available-for-sale securities		0		(0.1)
Pension and postretirement adjustment before reclassifications	(0.2)	(1.1)	(0.7)	(2)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	0.2	0.5	0.5	1
Pension and postretirement adjustment	0	(0.6)	(0.2)	(1)
Total other comprehensive gain	0	(0.6)	(0.2)	(1.1)
After Tax
Foreign currency translation adjustment	(165.6)	89.6	(62.9)	122.7
Available-for-sale securities adjustment		0.1		0.2
Unrealized holding gain on available-for-sale securities	0	0.1	0	0.2
Pension and postretirement adjustment before reclassifications	1.4	1.6	3	3
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	(0.7)	(0.8)	(1.3)	(1.5)
Pension and postretirement adjustment	0.7	0.8	1.7	1.5
Total other comprehensive (loss) income	$ (164.9)	$ 90.5	$ (61.2)	$ 124.4	$ 238.5

Equity Compensation Plans - Ad

Equity Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised		$ 47	$ 22.4
Nonqualified stock options contractual term (in years)		10 years
Granted (in shares)		885,818
Allocated share-based compensation expense		$ 19.8	15.4
Common stock issued, discounted price (in dollars per share)		$ 100.57		$ 78.65
Total unrecognized compensation cost related to nonvested share-based compensation arrangements		$ 90
Unrecognized compensation cost weighted average period (in years)		2 years 9 months 29 days
Nonvested stock options (in shares)		2,515,379
Stock options expected to vest (in shares)		2,119,518
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value		$ 7,700,000
Grant date fair value restricted stock vested		$ 9.1	$ 8.3
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,858
Nonqualified stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Granted (in shares)	19,798
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		236,699
Granted (in shares)		189,994
Restricted stock options (in shares)		590,945	2,957,429
Stock options expected to vest (in shares)		512,356	2,469,072
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (in shares)		14,779	15,854
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Number of shares per award		1
2013 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved and available for future issuance (in shares)		5,616,912
Minimum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target levels		0.00%
Maximum | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target levels		200.00%
One-Year Vesting | Nonqualified stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	17,402
Directors | Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	12,716

Equity Compensation Plans - Su

Equity Compensation Plans - Summary of Equity Awards Granted (Details) - shares	Apr. 16, 2018	Apr. 01, 2018	Jun. 30, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Stock (in shares)			885,818
Units (in shares)			1,369,268	1,125,004
Stock options
Class of Stock [Line Items]
Stock (in shares)			885,818
Stock options | Four-year graded vesting
Class of Stock [Line Items]
Stock (in shares)	11,491	873,383	944
Stock options | Three-year cliff vesting
Class of Stock [Line Items]
Stock (in shares)		0
Restricted stock
Class of Stock [Line Items]
Stock (in shares)			189,994
Units (in shares)			167,072	143,557
Restricted stock | Four-year graded vesting
Class of Stock [Line Items]
Stock (in shares)	2,338	187,462	194
Restricted stock | Three-year cliff vesting
Class of Stock [Line Items]
Stock (in shares)		0
Performance shares
Class of Stock [Line Items]
Units (in shares)			46,705
Performance shares | Four-year graded vesting
Class of Stock [Line Items]
Units (in shares)	0	0	0
Performance shares | Three-year cliff vesting
Class of Stock [Line Items]
Units (in shares)		46,705
January 1 to June 30, 2018 | Four-year graded vesting
Class of Stock [Line Items]
Equity award contractual term (in years)			4 years
April 1, 2018 | Four-year graded vesting
Class of Stock [Line Items]
Equity award contractual term (in years)		4 years
April 1, 2018 | Three-year cliff vesting
Class of Stock [Line Items]
Equity award contractual term (in years)		3 years
April 16, 2018 | Four-year graded vesting
Class of Stock [Line Items]
Equity award contractual term (in years)			4 years

Equity Compensation Plans - Bl

Equity Compensation Plans - Black Scholes (Details) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Option pricing model	Black-Scholes	Black-Scholes
Expected volatility	18.52%	18.71%
Risk-free interest rate	2.51%	1.82%
Expected term (in years)	4 years 4 months 24 days	4 years 6 months
Dividend yield	0.00%	0.00%
Weighted average grant date fair value per stock option (in dollars per share)	$ 21.23	$ 15.64

Equity Compensation Plans - 60

Equity Compensation Plans - Summary of Stock Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Number of Options
Outstanding, beginning balance (in shares)	8,907,109
Granted (in shares)	885,818
Exercised (in shares)	(1,369,268)
Cancelled or expired (in shares)	(222,517)
Outstanding, ending balance (in shares)	8,201,142
Options exercisable (in shares)	5,685,763	5,995,339
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 53.31
Granted (in dollars per share)	104.04
Exercised (in dollars per share)	36.70
Cancelled or expired (in dollars per share)	77.11
Outstanding, ending balance (in dollars per share)	60.92
Options exercisable (in dollars per share)	$ 49.06	$ 41.50
Aggregate Intrinsic Value
Outstanding, beginning balance	$ 380.2
Exercised	92.9
Outstanding, ending balance	383.2
Aggregate intrinsic value, options exercisable	$ 333.1	$ 326.8

Equity Compensation Plans - 61

Equity Compensation Plans - Summary of Restricted Stock Awards (Details)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Number of Shares
Outstanding, beginning balance (in shares)	8,907,109
Outstanding, ending balance (in shares)	8,201,142
Restricted stock
Number of Shares
Outstanding, beginning balance (in shares)	604,464
Granted (in shares)	236,699
Vested (in shares)	(205,731)
Forfeited (in shares)	(44,246)
Outstanding, ending balance (in shares)	591,186
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 78.28
Granted (in dollars per share) | $ / shares	111.27
Vested (in dollars per share) | $ / shares	75.09
Forfeited (in dollars per share) | $ / shares	87.66
Outstanding, ending balance (in dollars per share) | $ / shares	$ 91.87

Pension and Postretirement Be62

Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Plan and SERP
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 4	$ 4.4	$ 7.6	$ 8.6
Expected return on plan assets	(8.7)	(7.7)	(16.4)	(15.5)
Amortization of prior service credit	0.1	0	0.1	0.1
Amortization of net actuarial loss	0.8	1.2	1.6	2.2
Net periodic (benefit) cost	(3.8)	(2.1)	(7.1)	(4.6)
Employer contributions, net	0.3	0.3	0.5	0.5
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1	0.2	0.2
Expected return on plan assets	0	(0.1)	(0.1)	(0.2)
Amortization of prior service credit	(0.1)	0	(0.1)	0
Amortization of net actuarial loss	0.1	0.1	0.2	0.2
Net periodic (benefit) cost	0.1	0.1	0.2	0.2
Employer contributions, net	$ (0.2)	$ 0.2	$ (0.3)	$ 0.6

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) - segment	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Number of operating segments	3	2

Segment Reporting - Reconcilia

Segment Reporting - Reconciliations Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 601.3	$ 523.2	$ 1,182.5	$ 1,025.8
Expenses:
Cost of revenues (exclusive of items shown separately below)	(222.4)	(193.7)	(443.6)	(376.6)
Selling, general and administrative	(93)	(78.8)	(184.9)	(154.7)
Investment income and others, net	(4.6)	(3.4)	(5.3)	(5.3)
EBITDA	290.5	254.1	559.3	499.8
Depreciation and amortization of fixed assets	(41.6)	(31.8)	(82)	(65.6)
Amortization of intangible assets	(32)	(23.9)	(65.2)	(46.2)
Operating income	212.3	195	406.8	382.7
Interest expense	(31.9)	(28.5)	(64.8)	(56.9)
Income before income taxes	185	169.9	347.3	331.1
Insurance
Segment Reporting Information [Line Items]
Revenues	429.4	382.4	842.1	749.3
Expenses:
Cost of revenues (exclusive of items shown separately below)	(141.6)	(125.9)	(280.2)	(246.1)
Selling, general and administrative	(53.3)	(49.1)	(105.9)	(94.5)
Investment income and others, net	(1.8)	(3)	(4.3)	(5.6)
EBITDA	236.3	210.4	460.3	414.3
Depreciation and amortization of fixed assets	(25)	(21.8)	(52.3)	(45.4)
Amortization of intangible assets	(5.4)	(2.9)	(10.9)	(5)
Operating income	204.1	182.7	392.8	358.3
Energy and Specialized Markets
Segment Reporting Information [Line Items]
Revenues	129.9	110.3	255.4	216.6
Expenses:
Cost of revenues (exclusive of items shown separately below)	(56.3)	(48.8)	(112)	(94.5)
Selling, general and administrative	(34.9)	(27.7)	(69)	(55.8)
Investment income and others, net	(2.5)	(0.3)	(0.4)	0.5
EBITDA	41.2	34.1	74.8	65.8
Depreciation and amortization of fixed assets	(11)	(8.5)	(22)	(17)
Amortization of intangible assets	(21.2)	(17.4)	(42.8)	(34.3)
Operating income	6.5	7.9	9.6	15
Financial Services
Segment Reporting Information [Line Items]
Revenues	42	30.5	85	59.9
Expenses:
Cost of revenues (exclusive of items shown separately below)	(24.5)	(19)	(51.4)	(36)
Selling, general and administrative	(4.8)	(2)	(10)	(4.4)
Investment income and others, net	(0.3)	(0.1)	(0.6)	(0.2)
EBITDA	13	9.6	24.2	19.7
Depreciation and amortization of fixed assets	(5.6)	(1.5)	(7.7)	(3.2)
Amortization of intangible assets	(5.4)	(3.6)	(11.5)	(6.9)
Operating income	$ 1.7	$ 4.4	$ 4.4	$ 9.4

Segment Reporting - Regional L

Segment Reporting - Regional Long-lived Assets By Country (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Long-lived assets	$ 5,414.5	$ 5,422.7
U.S.
Segment Reporting Information [Line Items]
Long-lived assets	2,461.9	2,438.6
U.K.
Segment Reporting Information [Line Items]
Long-lived assets	2,627.9	2,656.6
Other countries
Segment Reporting Information [Line Items]
Long-lived assets	$ 324.7	$ 327.5

Related Parties (Details)

Related Parties (Details) - relatedparty	Jun. 30, 2018	Dec. 31, 2017
Related Party Transactions [Abstract]
Percentage of ownership on outstanding common stock required to become related party (more than)	5.00%	5.00%
Number of related parties	0	0

Commitments and Contingencies (

Commitments and Contingencies (Details)	Oct. 08, 2015patent
Xactware Solutions
Loss Contingencies [Line Items]
Patents allegedly infringed, number	7