Dun & Bradstreet 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2017shares
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	DNB
Entity Registrant Name	DUN & BRADSTREET CORP/NW
Entity Central Index Key	1,115,222
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	36,959,736

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Revenue	[1]	$ 428.3		$ 412.8		$ 1,215.5	$ 1,186.6
Operating Expenses		142.6		130.7		424.3	396.1
Selling and Administrative Expenses		164.6		164.9		498	524.3
Depreciation and Amortization		20.1		17.2		58.4	50.9
Restructuring Charge		5.8		3.2		22.3	18.8
Operating Costs		333.1		316		1,003	990.1
Operating Income		95.2		96.8		212.5	196.5
Interest Income		0.4		0.4		1.2	1.4
Interest Expense		(15.2)		(13.2)		(44.9)	(40.1)
Other Income (Expense) - Net	[2]	(0.9)		(92.2)		(0.9)	(91.9)
Non-Operating Income (Expense) - Net	[3]	(15.7)		(105)		(44.6)	(130.6)
Income (Loss) Before Provision for Income Taxes and Equity in Net Income of Affiliates		79.5		(8.2)		167.9	65.9
Less: Provision for Income Taxes		24.2		19.8		51.1	45
Equity in Net Income of Affiliates		0.5		1.2		3.2	2.9
Net Income (Loss) from Continuing Operations		55.8		(26.8)		120	23.8
Less: Net Income Attributable to the Noncontrolling Interest		(1.7)		(1.7)		(4.5)	(3.5)
Net Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet		54.1		(28.5)		115.5	20.3
Loss on Disposal of Business, no Tax Impact		0	[4]	(0.9)	[4]	(0.8)	(0.9)
Loss from Discontinued Operations, no Tax Impact		0	[4]	(0.9)	[4]	(0.8)	(0.9)
Net Income (Loss) Attributable to Dun & Bradstreet	[5]	$ 54.1		$ (29.4)		$ 114.7	$ 19.4
Basic Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders		$ 1.46		$ (0.78)		$ 3.13	$ 0.56
Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders		0		(0.02)		(0.02)	(0.03)
Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders		1.46		(0.80)		3.11	0.53
Diluted Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders		1.45		(0.78)		3.11	0.55
Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders		0		(0.02)		(0.02)	(0.02)
Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders		$ 1.45		$ (0.80)		$ 3.09	$ 0.53
Weighted Average Number of Shares Outstanding-Basic		37		36.6		36.9	36.4
Weighted Average Number of Shares Outstanding-Diluted		37.2		36.6		37.1	36.7
Cash Dividend Paid Per Common Share		$ 0.50		$ 0.48		$ 1.51	$ 1.45
Other Comprehensive Income, Net of Income Taxes:
Net Income (Loss) from Continuing Operations		$ 55.8		$ (26.8)		$ 120	$ 23.8
Loss from Discontinued Operations, no Tax Impact		0	[4]	(0.9)	[4]	(0.8)	(0.9)
Net Income (Loss)		55.8		(27.7)		119.2	22.9
Foreign Currency Translation Adjustments, no Tax Impact		13.6		16.8		36.5	4.5
Defined Benefit Pension Plans:
Prior Service Costs, Net of Tax Benefit (Expense) (1)	[6]	(0.1)		(0.2)		(0.4)	(0.6)
Net Actuarial Gain, Net of Tax Benefit (Expense) (2)		2.7		2.4		15.3	14.4
Total Other Comprehensive Income (Loss)		16.2		19		51.4	18.3
Comprehensive Income (Loss), Net of Income Taxes		72		(8.7)		170.6	41.2
Less: Comprehensive Income Attributable to the Noncontrolling Interest		(1.9)		(1.6)		(5.3)	(3.3)
Comprehensive Income (Loss) Attributable to Dun & Bradstreet		$ 70.1		$ (10.3)		$ 165.3	$ 37.9
[1]	Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively.
[2]	The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[3]	The following table summarizes “Non-Operating Income (Expense) - Net:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016Interest Income$0.4 $0.4 $1.2 $1.4Interest Expense(15.2) (13.2) (44.9) (40.1)Other Income (Expense) - Net (a)(0.9) (92.2) (0.9) (91.9)Non-Operating Income (Expense) - Net$(15.7) $(105.0) $(44.6) $(130.6) (a) The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[4]	Tax Benefit (Expense) of $0.1 million and $0.2 million during the three months ended September 30, 2017 and 2016, respectively. Tax Benefit (Expense) of $0.3 million and $0.4 million during the nine months ended September 30, 2017 and 2016, respectively.
[5]	Reported GAAP Net Income Attributable to Dun & Bradstreet Common Shareholders includes a net loss from Avention since the acquisition date of $1.6 million and $6.6 million for the three month and nine month periods ended September 30, 2017, respectively.
[6]	Tax Benefit (Expense) of $(1.0) million during each of the three months ended September 30, 2017 and 2016. Tax Benefit (Expense) of $(7.8) million and $(7.4) million during the nine months ended September 30, 2017 and 2016, respectively.

Consolidated Statements of Ope3

Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax	$ 0.1	$ 0.2	$ 0.3	$ 0.4
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ (1)	$ (1)	$ (7.8)	$ (7.4)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and Cash Equivalents		$ 431	$ 352.6
Accounts Receivable, Net of Allowance of $23.5 at September 30, 2017 and $23.6 December 31, 2016		403.9	543.6
Other Receivables		9.4	11.3
Prepaid Taxes		4.5	3.3
Other Prepaids		32.7	32.1
Other Current Assets		1.3	1.5
Total Current Assets		882.8	944.4
Non-Current Assets
Property, Plant and Equipment, Net of Accumulated Depreciation of $59.0 at September 30, 2017 and $50.6 at December 31, 2016		40.8	39.4
Computer Software, Net of Accumulated Amortization of $351.8 at September 30, 2017 and $321.2 at December 31, 2016		129.5	108.1
Goodwill (Note 15)	[1]	774.6	651.9
Deferred Income Tax		100.5	110.9
Other Receivables		1.7	1.9
Other Intangibles (Note 15)		324.5	296.1	[2]
Other Non-Current Assets		46.6	56.5
Total Non-Current Assets		1,418.2	1,264.8
Total Assets		2,301	2,209.2
Current Liabilities
Accounts Payable		40.5	46.7
Accrued Payroll		112.5	113.6
Accrued Income Tax		28.4	44.5
Short-Term Debt		30	22.5
Other Accrued and Current Liabilities (Note 6)		134.4	154.6
Deferred Revenue		608.7	628.1
Total Current Liabilities		954.5	1,010
Pension and Postretirement Benefits		499.5	541.8
Long-Term Debt		1,651.6	1,594.5
Liabilities for Unrecognized Tax Benefits		5.3	4.9
Other Non-Current Liabilities		47.4	45.8
Total Liabilities		3,158.3	3,197
Contingencies (Note 7)
DUN & BRADSTREET SHAREHOLDERS’ EQUITY (DEFICIT)
Capital Surplus		327.8	317.6
Retained Earnings		3,018.2	2,959.6
Treasury Stock, at cost, 45.0 shares at September 30, 2017 and 45.1 shares at December 31, 2016		(3,321.8)	(3,330.4)
Accumulated Other Comprehensive Income (Loss)		(899)	(949.6)
Total Dun & Bradstreet Shareholders’ Equity (Deficit)		(874)	(1,002)
Noncontrolling Interest		16.7	14.2
Total Equity (Deficit)		(857.3)	(987.8)
Total Liabilities and Shareholders' Equity (Deficit)		2,301	2,209.2
Series A Junior Participating Preferred Stock
DUN & BRADSTREET SHAREHOLDERS’ EQUITY (DEFICIT)
Preferred Stock		0	0
Preferred Stock
DUN & BRADSTREET SHAREHOLDERS’ EQUITY (DEFICIT)
Preferred Stock		0	0
Series Common Stock
DUN & BRADSTREET SHAREHOLDERS’ EQUITY (DEFICIT)
Common Stock		0	0
Common Stock
DUN & BRADSTREET SHAREHOLDERS’ EQUITY (DEFICIT)
Common Stock		$ 0.8	$ 0.8
[1]	Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.
[2]	Customer Relationships - Net of accumulated amortization of $36.7 million, $32.9 million, $28.8 million and $25.1 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. Other Definite-Lived Intangibles - Net of accumulated amortization of $99.0 million, $100.7 million, $95.4 million and $91.2 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts Receivable, Allowance	$ 23.5	$ 23.6
Property, Plant and Equipment, Accumulated Depreciation	59	50.6
Computer Software, Accumulated Amortization	$ 351.8	$ 321.2
Treasury Stock, shares	45	45.1
Series A Junior Participating Preferred Stock
Preferred Stock, par value per share	$ 0.01	$ 0.01
Preferred Stock, authorized	0.5	0.5
Preferred Stock, outstanding	0	0
Preferred Stock
Preferred Stock, par value per share	$ 0.01	$ 0.01
Preferred Stock, authorized	9.5	9.5
Preferred Stock, outstanding	0	0
Series Common Stock
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, authorized	10	10
Series Common Stock, outstanding	0	0
Common Stock
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, authorized	200	200
Common Stock, issued	81.9	81.9

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net Income	$ 119.2	$ 22.9
Less:
Loss on Disposal of Business - Discontinued Operations	(0.8)	(0.9)
Net Income from Continuing Operations	120	23.8
Reconciliation of Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	58.4	50.9
Amortization of Unrecognized Pension Loss	28.4	26.9
Loss from Sales of Business	0.7	89.6
Income Tax Benefit from Stock-Based Awards	6.5	13.7
Excess Tax Benefit on Stock-Based Awards	0	(7.1)
Equity-Based Compensation	16.3	15.4
Restructuring Charge	22.3	18.8
Restructuring Payments	(18.6)	(28.4)
Changes in Deferred Income Taxes, Net	0.5	(1.5)
Changes in Accrued Income Taxes, Net	(22.1)	(19)
Changes in Current Assets and Liabilities, Net of Acquisitions:
(Increase) Decrease in Accounts Receivable	159.8	109.7
(Increase) Decrease in Other Current Assets	1.1	8.7
Increase (Decrease) in Deferred Revenue	(45.3)	(38.2)
Increase (Decrease) in Accounts Payable	(8.4)	26.1
Increase (Decrease) in Accrued Liabilities	(41.9)	15.3
Increase (Decrease) in Other Accrued and Current Liabilities	10.8	9.9
Changes in Non-Current Assets and Liabilities, Net of Acquisitions:
(Increase) Decrease in Other Long-Term Assets	12.6	10
Net Increase (Decrease) in Long-Term Liabilities	(50.4)	(45.6)
Net, Other Non-Cash Adjustments	1.6	1
Net Cash Provided by Operating Activities	252.3	280
Cash Flows from Investing Activities:
Payments for Contingent Liabilities and Transaction Costs for Businesses Divested, Net of Proceeds Received	(1.8)	(3.1)
Payments for Acquisitions of Businesses, Net of Cash Acquired	(150)	0
Proceeds from Maturity and (Payment) for Debt Security Investment	0.5	0.5
Cash Settlements of Foreign Currency Contracts	8.8	(5.5)
Capital Expenditures	(6.7)	(12.1)
Additions to Computer Software and Other Intangibles	(42.2)	(35.8)
Net, Other	0.1	0
Net Cash Used in Investing Activities	(191.3)	(56)
Cash Flows from Financing Activities:
Net (Payment) Proceeds Related to Stock-Based Plans	(2.4)	42.3
Payments of Dividends	(55.6)	(52.7)
Proceeds from Borrowings on Credit Facilities	770	331.5
Payments of Borrowings on Credit Facilities	(692.2)	(528.9)
Payments of borrowings on Term Loan Facilities	(15)	(15)
Excess Tax Benefit on Stock-Based Awards	0	7.1
Capital Lease and Other Long-Term Financing Obligation Payment	(0.1)	(0.2)
Net, Other	(3)	(3.1)
Net Cash (Used in) Provided by Financing Activities	1.7	(219)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	15.7	(39.8)
Increase (Decrease) in Cash and Cash Equivalents Before Classified to Asset Held for Sale	78.4	(34.8)
Less Cash Classified as Asset Held for Sale	0	(3.6)
Cash and Cash Equivalents, Beginning of Period	352.6	365.7
Cash and Cash Equivalents, End of Period	431	327.3
Cash Paid for:
Income Taxes, Net of Refunds	66.1	51.8
Interest	$ 32.6	$ 29.5

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock ($0.01 Par Value)	Capital Surplus	Retained Earnings	Treasury Stock	Cumulative Translation Adjustment	Defined Benefit Postretirement Plans	Total D&B Shareholders' Equity (Deficit)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2015	$ (1,105.3)	$ 0.8	$ 292.2	$ 2,932.8	$ (3,377.1)	$ (291.7)	$ (673.8)	$ (1,116.8)	$ 11.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	22.9	0	0	19.4	0	0	0	19.4	3.5
Payment to Noncontrolling Interest	(1.7)	0	0	0	0	0	0	0	(1.7)
Equity-Based Plans	64.3	0	19.8	0	44.5	0	0	64.3	0
Pension Adjustments, net of tax expense of $7.5 YTD Q3 2017 and $7.0 YTD Q3 2016	13.8	0	0	0	0	0	13.8	13.8	0
Dividend Declared	(52.8)	0	0	(52.8)	0	0	0	(52.8)	0
Change in Cumulative Translation Adjustment	4.5	0	0	0	0	4.7	0	4.7	(0.2)
Ending Balance at Sep. 30, 2016	(1,054.3)	0.8	312	2,899.4	(3,332.6)	(287)	(660)	(1,067.4)	13.1
Beginning Balance at Dec. 31, 2016	(987.8)	0.8	317.6	2,959.6	(3,330.4)	(266.2)	(683.4)	(1,002)	14.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	119.2	0	0	114.7	0	0	0	114.7	4.5
Payment to Noncontrolling Interest	(2.8)	0	0	0	0	0	0	0	(2.8)
Equity-Based Plans	18.8	0	10.2	0	8.6	0	0	18.8	0
Pension Adjustments, net of tax expense of $7.5 YTD Q3 2017 and $7.0 YTD Q3 2016	14.9	0	0	0	0	0	14.9	14.9	0
Dividend Declared	(56.1)	0	0	(56.1)	0	0	0	(56.1)	0
Change in Cumulative Translation Adjustment	36.5	0	0	0	0	35.7	0	35.7	0.8
Ending Balance at Sep. 30, 2017	$ (857.3)	$ 0.8	$ 327.8	$ 3,018.2	$ (3,321.8)	$ (230.5)	$ (668.5)	$ (874)	$ 16.7

Consolidated Statements of Sha8

Consolidated Statements of Shareholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Pension Adjustments Tax	$ 7.5	$ 7

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
Disclosure Basis Of Presentation Additional Information [Abstract]
Basis of Presentation	Basis of Presentation These interim unaudited consolidated financial statements have been prepared in accordance with the instructions to the Quarterly Report on Form 10-Q. They should be read in conjunction with the consolidated financial statements and related notes, which appear in The Dun & Bradstreet Corporation’s (“Dun & Bradstreet” or “we” or “us” or “our” or the “Company”) Annual Report on Form 10-K for the year ended December 31, 2016 . The unaudited consolidated results for interim periods do not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for annual financial statements and are not necessarily indicative of results for the full year or any subsequent period. In the opinion of our management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement of the unaudited consolidated financial position, results of operations and cash flows at the dates and for the periods presented have been included. All inter-company transactions have been eliminated in consolidation. We manage and report our business through the following two segments: • Americas, which consists of our operations in the United States (“U.S.”), Canada, and our Latin America Worldwide Network (we divested our Latin America operations in September 2016); and • Non-Americas, which consists of our operations in the United Kingdom (“U.K.”), Greater China, India and our European and Asia Pacific Worldwide Network (we divested our operations in both the Netherlands and Belgium (“Benelux”) in November 2016 and our Australian operations in June 2015). See Note 14 to the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q for further detail. Effective January 1, 2017, we began managing and reporting our Sales & Marketing Solutions as: • Sales Acceleration - solutions designed to align sales and marketing teams around the same refined and inter-connected information (data that is current, tied to buying signals, and delivered with context) to shorten sales cycles, increase win rates, and accelerate revenue growth more quickly. Our customers want to target more intelligently to enhance sales productivity; that is to know who they are selling to, what their customers might be buying, how things are changing at their customers’ companies, where their customers have purchased before, and how to most efficiently engage with them. We provide these solutions through applications such as D&B Hoovers, as well as direct access to our contact data; and • Advanced Marketing Solutions (newly defined) - consists of our Master Data solutions, which enable our customers to integrate and organize data to create a single view of customers and prospects, enrich data, continuously manage data quality and link company identity and hierarchy. It also consists of new use cases such as Audience Solutions, which uses data and analytics to fuel enhanced programmatic targeting and web visitor intelligence. We also evaluate our business and provide the following supplemental revenue metrics. For Trade Credit, we further provide revenue for the D&B Credit Suite and Other Trade Credit. Prior to January 1, 2017, the D&B Credit Suite was referred to as DNBi ® . Also effective January 1, 2017, we began providing a new revenue metric called D&B Hoovers Suite. This new metric encompasses our legacy Hoover’s product, our new D&B Hoovers product, our Salesforce alliance revenue through data.com and our Avention, Inc. (“Avention”) product portfolio. Management believes that these measures provide further insight into our performance and the growth of our business. We no longer report our Sales and Marketing Solutions as Traditional Prospecting Solutions or use the prior definition of Advanced Marketing Solutions and we no longer report our total revenue on a Direct or Alliances & Partners basis. The financial statements of the subsidiaries outside of the U.S. and Canada reflect results for the three month and nine month periods ended August 31 in order to facilitate the timely reporting of the unaudited consolidated financial results and unaudited consolidated financial position. In August of 2016, we announced the sale of our domestic operations in Benelux and Latin America, shifting these businesses into our Worldwide Network partnership model. Our Worldwide Network arrangements include long-term commercial agreements that provide our partners with access to key Dun & Bradstreet assets, including global data, brand usage, consulting and technology services. Historically, technology services were not classified as revenue as we viewed them as ancillary in nature. As we shifted more of our Non-Americas businesses into the Worldwide Network partnership model as a result of the divestitures of our operations in Benelux and Latin America, such technology services now represent activities that constitute part of our ongoing and central operations. Accordingly, starting in the third quarter of 2016 we began to classify the technology services as revenue. See Note 14 to the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q for further detail on the divestitures. Where appropriate, we have reclassified certain prior year amounts to conform to the current year presentation.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements We consider the applicability and impact of all Accounting Standards Updates (“ASUs”). The ASUs not listed below were assessed and determined to be either not applicable or are expected to have an immaterial impact on our consolidated financial position and/or results of operations. Recently Adopted Accounting Pronouncements In December 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-19, “Technical Corrections and Improvements.” The standard addresses the differences between the original guidance, such as legacy FASB statements, and the guidance in the Accounting Standards Codification (“ASC”) and clarifies certain existing guidance by updating wording and correcting references. The standard also simplifies the ASC through minor structural changes to headings or minor editing of text and makes improvements that are not expected to have a significant impact on current accounting practices. Most of the amendments do not require transition guidance and are effective upon issuance. There are certain amendments that clarify existing guidance or correct references in the ASC that could potentially result in changes in current practice. The transition guidance must be applied prospectively, except for the amendment related to internal-use software license fees paid in a cloud-computing arrangement, which may be applied either prospectively or retrospectively. These amendments were effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2016. The adoption of this authoritative guidance did not have a material impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09 “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” This guidance simplifies several aspects of accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The guidance was effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2016. Early adoption was permitted. We adopted this guidance on a prospective basis. We did not change our forfeiture accounting policy. The adoption of this authoritative guidance did not have a material impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-07 “Simplifying the Transition to the Equity Method of Accounting.” This guidance eliminates the requirement to apply the equity method of accounting retrospectively when a reporting entity obtains significant influence over a previously held investment. The standard was effective for fiscal years beginning after December 15, 2016 and the interim periods within those years. Early adoption was permitted. The guidance should be applied prospectively for investments that qualify for the equity method of accounting after the effective date. The adoption of this authoritative guidance did not have a material impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-05 “Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships.” This guidance clarifies that a change in counterparty to a derivative contract, in and of itself, does not require the dedesignation of a hedging relationship. The standard was effective for fiscal years beginning after December 15, 2016 and interim periods within those years. Early adoption was permitted. Entities may adopt the guidance prospectively or use a modified retrospective approach to apply it to derivatives outstanding during all or a portion of the periods presented in the period of adoption. The adoption of this authoritative guidance did not have a material impact on our consolidated financial statements. Recently Issued Accounting Pronouncements In May 2017, the FASB issued ASU No. 2017-09, “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.” The standard amends the scope of modification accounting for share-based payments arrangements. An entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. The standard is effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-07, “Compensation - Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefits Cost.” The standard amends the requirements in ASC Topic 715, “Compensation - Retirement Benefits” related to the income statement presentation of the components of net periodic benefit cost for an entity's sponsored defined benefit pension and other postretirement plans. The standard requires entities to disaggregate the current service-cost component from the other components of net benefit cost and present it with other current compensation costs for related employees in the income statement and present the other components elsewhere in the income statement outside of income from operations if such subtotal is presented. Entities are required to disclose the income statement lines that contain the other components if they are not presented on appropriately described lines. An entity is only allowed to capitalize the service-cost component of net benefit cost. The standard is effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of any annual period for which an entity's financial statements (interim or annual) have not been issued or made available for issuance. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The standard simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment to determine if a quantitative impairment assessment is necessary for the reporting unit. If the reporting unit passes the qualitative assessment, there is no impairment and no further analysis is required. An entity applies the same one-step impairment test to all reporting units, including those with zero or negative carrying amounts; however, the entity is required to disclose the amount of goodwill allocated to reporting units with zero or negative carrying amounts along with the reportable segment that includes the reporting unit. An entity must consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit. The standard is effective for annual and any interim impairment tests for periods beginning after December 15, 2019. Early adoption is allowed for all entities as of January 1, 2017, for annual and any interim impairment tests occurring after January 1, 2017. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business.” The standard provides a framework to use in determining when a set of assets and activities is a business. The standard requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If the fair value meets this threshold, the set of transferred assets and activities is not a business. The standard also requires a business to include at least one substantive process and narrows the definition of outputs by more closely aligning it with how outputs are described in ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” The standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2017. Entities must apply the guidance prospectively to any transactions occurring within the period of adoption. Early adoption is permitted in any interim or annual reporting period for which financial statements have not yet been issued or have not been made available for issuance. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.” The standard eliminates the exception within Topic 740 of the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. As a result of the removal of the exception, a reporting entity would recognize the tax expense from the sale of the asset in the seller's tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer's jurisdiction would also be recognized at the time of the transfer. The standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2017. Early adoption is permitted but the guidance can only be adopted in the first interim period of a fiscal year. Entities must apply the modified retrospective approach, with a cumulative-effect adjustment recorded in retained earnings as of the beginning of the period of the adoption. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force).” The standard amends the guidance in ASC 230 on the classification of certain cash receipts and payments in the statement of cash flows. The standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2017. Early adoption is permitted. Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively from the earliest date practicable if retrospective application would be impracticable. We do not expect the adoption of this authoritative guidance to have a material impact on our consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The standard changes the impairment model for most financial assets and certain other instruments. For trade and other receivables, held-to-maturity debt securities, loans and other instruments, entities will be required to use a new forward-looking “expected loss” model that generally will result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. Entities will have to disclose significantly more information, including information they use to track credit quality by year of origination for most financing receivables. The standard is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2019. The guidance requires entities to apply the amendments through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). For certain assets (such as debt securities for which an other-than-temporary impairment has been recognized before the effective date), a prospective transition approach is required. We do not expect that the adoption of this authoritative guidance will have a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 “Leases (Topic 842).” This standard requires entities that lease assets to recognize on the balance sheet, subject to certain exceptions, the assets and liabilities for the rights and obligations created by those leases. The standard is effective for fiscal years and the interim periods within those fiscal years beginning after December 15, 2018. The guidance is required to be applied by the modified retrospective transition approach. Early adoption is permitted. We are currently assessing the impact of the adoption of this authoritative guidance on our consolidated financial statements. However, we anticipate that the adoption of this standard will have a material impact on our consolidated balance sheet. New Revenue Recognition Standard: In May 2014, the FASB issued ASU No. 2014-09, which outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers and supersedes and replaces nearly all existing GAAP revenue recognition guidance, including industry-specific guidance. The authoritative guidance provides a five-step analysis of transactions to determine when and how revenue is recognized. The five steps are: (i) identify the contract with the customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations; and (v) recognize revenue when or as each performance obligation is satisfied. The authoritative guidance applies to all contracts with customers except those that are within the scope of other topics in the FASB ASC. The authoritative guidance requires significantly expanded disclosures about revenue recognition and was initially effective for fiscal years and the interim periods within these fiscal years beginning on or after December 15, 2016. In August 2015, the FASB issued ASU No. 2015-14 “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date.” This standard defers for one year the effective date of ASU No. 2014-09. The deferral will result in this standard being effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2017. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016 including interim reporting periods within that reporting period. In March 2016, the FASB issued ASU No. 2016-08 “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net).” This guidance amends the principal versus agent guidance in the new revenue standard. The amendments retain the guidance that the principal in an arrangement controls a good or service before it is transferred to a customer. The amendments clarify how an entity should identify the unit of accounting for principal versus agent evaluation and how it should apply the control principle to certain types of arrangements, such as service transactions. The amendments also reframe the indicators to focus on evidence that an entity is acting as a principal rather than an agent, revise examples in the new standard and add new examples. In April 2016, the FASB issued ASU No. 2016-10 “Revenue From Contracts With Customers (Topic 606): Identifying Performance Obligations and Licensing.” The guidance amends identifying performance obligations and accounting for licenses of intellectual property in the new revenue standard. The amendments address implementation issues that were raised by stakeholders and discussed by the Revenue Recognition Transition Resource Group. The amendments updated examples and added several new examples to illustrate the new guidance. In May 2016, the FASB issued ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting (SEC Update)” which rescinds certain SEC guidance from the FASB Accounting Standards Codification in response to announcements made by the SEC staff at the EITF’s March 3, 2016, meeting. In May 2016, the FASB issued ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients,” which amends certain aspects of ASU No. 2014-09 such as assessing collectibility, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. In December 2016, the FASB issued ASU No. 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers,” which clarifies certain aspects of the revenue recognition guidance, including allowing entities to not make quantitative disclosures about remaining performance obligations in certain cases and requiring entities that use any of the new or previously existing optional exemptions to expand their qualitative disclosures. The amendments do not change any of the principles in ASU No. 2014-09. We will adopt the new revenue guidance on January 1, 2018 and apply the modified retrospective transition method. We are currently assessing the impact of the adoption of this authoritative guidance on our consolidated financial statements and anticipate this standard will have a material impact on our consolidated financial statements. While we are continuing to assess all potential impacts of the standard, we currently believe the most significant changes relate to how we identify performance obligations for certain data products, accounting for non-cancelable multi-year contracts, determining our receivable, net contract asset or liability for each contract, capitalization and amortization of sales commissions and additional disclosures (e.g., unsatisfied performance obligations in non-cancelable multi-year contracts). We have identified an implementation project team and related oversight processes. Given the scope of the work required to implement the recognition and disclosure requirements under the new standard, we began the assessment process in 2014 and have since made significant progress, including identification of changes to policy, processes, systems and controls. This also includes the assessment of data availability and presentation necessary to meet the additional disclosure requirements of the guidance in the notes to the consolidated financial statements.

Restructuring Charge

Restructuring Charge	9 Months Ended
	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring Charge	Restructuring Charge We incurred restructuring charges (which generally consist of employee severance and termination costs, contract terminations and/or costs to terminate lease obligations less assumed sublease income). These charges were incurred as a result of eliminating, consolidating, standardizing and/or automating our business functions. Restructuring charges have been recorded in accordance with ASC 712-10, “Nonretirement Postemployment Benefits,” or “ASC 712-10” and/or ASC 420-10, “Exit or Disposal Cost Obligations,” or “ASC 420-10”, as appropriate. We record severance costs provided under an ongoing benefit arrangement once they are both probable and reasonably estimable in accordance with the provisions of ASC 712-10. We account for one-time termination benefits, contract terminations and/or costs to terminate lease obligations less assumed sublease income in accordance with ASC 420-10, which addresses financial accounting and reporting for costs associated with restructuring activities. Under ASC 420-10, we establish a liability for costs associated with an exit or disposal activity, including severance and lease termination obligations, and other related costs, when the liability is incurred, rather than at the date that we commit to an exit plan. We reassess the expected cost to complete the exit or disposal activities at the end of each reporting period and adjust our remaining estimated liabilities, if necessary. The determination of when we accrue for severance costs and which standard applies depends on whether the termination benefits are provided under an ongoing arrangement as described in ASC 712-10 or under a one-time benefit arrangement as defined by ASC 420-10. Inherent in the estimation of the costs related to the restructurings are assessments related to the most likely expected outcome of the significant actions to accomplish the exit or disposal activities. In determining the charges related to the restructurings, we had to make estimates related to the expenses associated with the restructurings. These estimates may vary significantly from actual costs depending, in part, upon factors that may be beyond our control. We will continue to review the status of our restructuring obligations on a quarterly basis and, if appropriate, record changes to these obligations in current operations based on management’s most current estimates. Three Months Ended September 30, 2017 vs. Three Months Ended September 30, 2016 During the three months ended September 30, 2017 , we recorded a $5.8 million restructuring charge. This charge was comprised of: • Severance costs of $3.6 million in accordance with the provisions of ASC 712-10. Approximately 50 employees were impacted. Most of the employees impacted exited the Company by the end of the third quarter of 2017 . The cash payments for these employees will be substantially completed by the end of the second quarter of 2018 ; and • Contract termination, lease termination obligations and other exit costs, including those to consolidate or close facilities of $2.2 million . During the three months ended September 30, 2016 , we recorded a $3.2 million restructuring charge. This charge was comprised of: • Severance costs of $3.2 million in accordance with the provisions of ASC 712-10. Approximately 70 employees were impacted. Of these 70 employees, approximately 60 employees exited the Company by the end of the third quarter of 2016 , with the remaining primarily having exited by the end of the fourth quarter of 2016 . The cash payments for these employees were substantially completed by the end of the first quarter of 2017 . Nine Months Ended September 30, 2017 vs. Nine Months Ended September 30, 2016 During the nine months ended September 30, 2017 , we recorded a $22.3 million restructuring charge. This charge was comprised of: • Severance costs of $15.6 million and $1.6 million in accordance with the provisions of ASC 712-10 and ASC 420-10, respectively. Approximately 320 employees were impacted. Of these 320 employees, approximately 285 employees exited the Company by the end of the third quarter of 2017 , with the remaining primarily to exit by the end of the fourth quarter of 2017 . The cash payments for these employees will be substantially completed by the end of the second quarter of 2018 ; and • Contract termination, lease termination obligations and other exit costs, including those to consolidate or close facilities of $5.1 million . During the nine months ended September 30, 2016 , we recorded a $18.8 million restructuring charge. This charge was comprised of: • Severance costs of $18.8 million in accordance with the provisions of ASC 712-10. Approximately 325 employees were impacted. Of these 325 employees, approximately 315 employees exited the Company by the end of the third quarter of 2016 , with the remaining primarily having exited by the end of the fourth quarter of 2016 . The cash payments for these employees were substantially completed by the end of the first quarter of 2017 . The following tables set forth, in accordance with ASC 712-10 and/or ASC 420-10, the restructuring reserves and utilization: Severance and Termination Contract Termination, Lease Termination Obligations and Other Exit Costs Total Restructuring Charges: Balance Remaining as of December 31, 2016 $ 8.3 $ 1.7 $ 10.0 Charge Taken during the First Quarter 2017 7.7 1.3 9.0 Payments Made during the First Quarter 2017 (4.1 ) (0.4 ) (4.5 ) Balance Remaining as of March 31, 2017 $ 11.9 $ 2.6 $ 14.5 Charge Taken during the Second Quarter 2017 5.9 1.6 7.5 Payments Made during the Second Quarter 2017 (6.2 ) (1.8 ) (8.0 ) Balance Remaining as of June 30, 2017 $ 11.6 $ 2.4 $ 14.0 Charge Taken during the Third Quarter 2017 $ 3.6 $ 2.2 $ 5.8 Payments Made during the Third Quarter 2017 (5.7 ) (0.6 ) (6.3 ) Balance Remaining as of September 30, 2017 $ 9.5 $ 4.0 $ 13.5 Severance and Termination Contract Termination, Lease Termination Obligations and Other Exit Costs Total Restructuring Charges: Balance Remaining as of December 31, 2015 $ 18.6 $ 2.3 $ 20.9 Charge Taken during the First Quarter 2016 9.7 — 9.7 Payments Made during the First Quarter 2016 (10.1 ) (0.3 ) (10.4 ) Balance Remaining as of March 31, 2016 $ 18.2 $ 2.0 $ 20.2 Charge Taken during the Second Quarter 2016 5.9 — 5.9 Payments Made during the Second Quarter 2016 (10.0 ) (0.4 ) (10.4 ) Balance Remaining as of June 30, 2016 $ 14.1 $ 1.6 $ 15.7 Charge Taken during the Third Quarter 2016 $ 3.2 $ — $ 3.2 Payments Made during the Third Quarter 2016 (7.6 ) (0.1 ) (7.7 ) Balance Remaining as of September 30, 2016 $ 9.7 $ 1.5 $ 11.2

Notes Payable and Indebtedness

Notes Payable and Indebtedness	9 Months Ended
	Sep. 30, 2017
Disclosure Notes Payable And Indebtedness Additional Information [Abstract]
Notes Payable and Indebtedness	Notes Payable and Indebtedness Our borrowings are summarized in the following table: September 30, 2017 At December 31, 2016 Maturity Principal Amount Debt Issuance Costs and Discount* Carrying Value Principal Amount Debt Issuance Costs and Discount* Carrying Value Short-Term Debt: Term Loan Facility $ 30.0 $ — $ 30.0 $ 22.5 $ — $ 22.5 Total Short-Term Debt $ 30.0 $ — $ 30.0 $ 22.5 $ — $ 22.5 Long-Term Debt: Five Year 3.50% senior notes (1) (2) December 1, 2017 $ 450.0 $ 0.1 $ 449.9 $ 450.0 $ 0.6 $ 449.4 Ten Year 4.625% senior notes (1) (2) December 1, 2022 300.0 2.8 297.2 300.0 3.2 296.8 Five Year 4.25% senior notes (1) (3) June 15, 2020 300.0 2.1 297.9 300.0 2.7 297.3 Term Loan Facility November 13, 2020 330.0 1.0 329.0 352.5 1.3 351.2 Revolving Credit Facility July 23, 2019 277.6 — 277.6 199.8 — 199.8 Commercial Paper Program July 23, 2019 — — — — — — Total Long-Term Debt $ 1,657.6 $ 6.0 $ 1,651.6 $ 1,602.3 $ 7.8 $ 1,594.5 *Represents unamortized portion of debt issuance costs and discounts. (1) The notes contain certain covenants that limit our ability to create liens, enter into sale and leaseback transactions and consolidate, merge or sell assets to another entity. We were in compliance with these non-financial covenants at September 30, 2017 and December 31, 2016 . The notes do not contain any financial covenants. (2) The interest rates are subject to an upward adjustment if our debt ratings decline three levels below the Standard & Poor ’ s ® and/or Fitch ® BBB+ credit ratings that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rates and the rates cannot adjust below the initial interest rates (see further discussion below). (3) The interest rate is subject to an upward adjustment if our debt ratings decline one level below the Standard & Poor’s BBB- credit rating and/or two levels below the Fitch BBB credit rating that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rate and the rate cannot adjust below the initial interest rate (see further discussion below). On March 27, 2017, Standard & Poor’s Ratings Services downgraded our corporate credit rating to BB+ from BBB-. As a result, and in accordance with the provisions of their indentures, the interest rates on each of our senior notes were adjusted above their initial stated coupons by 25 basis points commencing with the interest period during which the downgrade occurred. As a result of the coupon adjustment, the incremental interest cost for the quarter ended March 31, 2017 was approximately $0.8 million , which included a component that was retroactive to the commencement of the respective senior note interest periods in December 2016. Starting in the second quarter of 2017, the incremental interest cost per quarter is $0.7 million until either the maturity of any one of the senior notes or a change in our corporate credit rating that triggers an adjustment in our interest rate coupons, whichever is earlier. On May 22, 2017, Fitch Ratings downgraded our corporate credit rating to BBB- from BBB. The interest rates on each of our senior notes were not impacted as a result of the downgrade. Any further downgrade in our corporate credit rating by either rating agency would result in additional increases in the interest rates of our senior notes. In addition, further downgrades may increase our overall cost of borrowing and/or may negatively impact our ability to raise additional debt capital. In accordance with ASC 470, “Debt,” a short-term obligation that will be refinanced with successive short-term obligations may be classified as non-current as long as the cumulative period covered by the financing agreement is uninterrupted and extends beyond one year. In addition, a short-term obligation shall be excluded from current liabilities if the entity has both the intention and ability to refinance the obligation on a long-term basis. Accordingly, the outstanding balances associated with the five year 3.50% senior notes and the $1 billion revolving credit facility were both classified as “Long-Term Debt” as of September 30, 2017 and December 31, 2016. Term Loan Facility On May 14, 2015, we entered into a delayed draw unsecured term loan facility which provided for borrowings in the form of up to two drawdowns in an aggregate principal amount of up to $400 million at any time up to and including November 15, 2015 (the “term loan facility”). The term loan facility matures five years from the date of the initial drawdown. Proceeds under the term loan facility were designated to be used for general corporate purposes including the refinancing of the 2.875% senior notes that matured in November 2015 and the repayment of borrowings outstanding under the $1 billion revolving credit facility. Borrowings under the term loan facility bear interest at a rate of LIBOR plus a spread. On March 27, 2017, Standard & Poor’s Ratings Services downgraded our corporate credit rating to BB+ from BBB-. As a result, and in accordance with the terms of the term loan facility, the spread under the term loan facility increased from 137.5 basis points to 150.0 basis points. Our initial draw down under the term loan facility in the amount of $400 million was made in November 2015, establishing a maturity of November 2020. We also committed to repay the borrowings in prescribed installments over the five year period. Repayments expected to be made within one year are classified as “Short-Term Debt” and the remaining outstanding balance is classified as “Long-Term Debt.” The weighted average interest rates associated with the outstanding balances as of September 30, 2017 and December 31, 2016 were 2.73% and 2.03% , respectively. The term loan facility requires the maintenance of interest coverage and total debt to Earnings Before Interest, Income Taxes, Depreciation and Amortization (“EBITDA”) ratios, which are defined in the term loan facility credit agreement and which are generally identical to those contained in the $1 billion revolving credit facility. We were in compliance with the term loan facility financial and non-financial covenants at September 30, 2017 and December 31, 2016. Revolving Credit Facility and Commercial Paper Program We currently have a $1 billion revolving credit facility maturing in July 2019. Borrowings under the $1 billion revolving credit facility bear interest at a rate of LIBOR plus a spread. On March 27, 2017, Standard & Poor’s Rating Services downgraded our corporate credit rating to BB+ from BBB-. As a result, and in accordance with the terms of the facility, the spread under the $1 billion revolving credit facility increased from 110.0 basis points to 120.0 basis points. The facility requires the maintenance of interest coverage and total debt to EBITDA ratios which are defined in the $1 billion revolving credit facility credit agreement. We were in compliance with the $1 billion revolving credit facility financial and non-financial covenants at September 30, 2017 and December 31, 2016. The weighted average interest rates associated with the outstanding balances as of September 30, 2017 and December 31, 2016 were 2.45% and 2.07% , respectively. We borrowed under this facility from time to time during the nine months ended September 30, 2017 and the year ended December 31, 2016 to supplement the timing of receipts in order to fund our working capital. We also borrowed under this facility during the first quarter of 2017 to fund a portion of the consideration for our purchase of Avention. This facility also supports our commercial paper program. Under this program, we may issue from time to time unsecured promissory notes in the commercial paper market in private placements exempt from registration under the Securities Act of 1933, as amended, for a cumulative face amount not to exceed $800 million outstanding at any one time and with maturities not exceeding 364 days from the date of issuance. Outstanding commercial paper would effectively reduce the amount available for borrowing under our $1 billion revolving credit facility. We did not borrow under our commercial paper program during the nine months ended September 30, 2017 and the year ended December 31, 2016. Other We were contingently liable under open standby letters of credit and bank guarantees issued by our banks in favor of third parties totaling $2.9 million at September 30, 2017 and $2.6 million at December 31, 2016. Interest paid for all outstanding debt totaled $32.6 million and $29.5 million during the nine months ended September 30, 2017 and 2016 , respectively.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings (loss) per share (“EPS”) is computed by dividing net income (loss) for the period by the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted-average number of common shares outstanding during the period, plus the dilutive effect of outstanding restricted stock unit awards, stock options, and contingently issuable shares using the treasury stock method. See Note 1 to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2016 for further detail on our accounting policies related to EPS. The following table sets forth the computation of basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders – Basic and Diluted $ 54.1 $ (28.5 ) $ 115.5 $ 20.3 Loss from Discontinued Operations – Net of Income Taxes — (0.9 ) (0.8 ) (0.9 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders – Basic and Diluted $ 54.1 $ (29.4 ) $ 114.7 $ 19.4 Weighted Average Number of Shares Outstanding – Basic 37.0 36.6 36.9 36.4 Dilutive Effect of Our Stock Incentive Plans 0.2 — 0.2 0.3 Weighted Average Number of Shares Outstanding – Diluted 37.2 36.6 37.1 36.7 Basic Earnings (Loss) Per Share of Common Stock: Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders $ 1.46 $ (0.78 ) $ 3.13 $ 0.56 Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders — (0.02 ) (0.02 ) (0.03 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 1.46 $ (0.80 ) $ 3.11 $ 0.53 Diluted Earnings (Loss) Per Share of Common Stock: Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders $ 1.45 $ (0.78 ) $ 3.11 $ 0.55 Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders — (0.02 ) (0.02 ) (0.02 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 1.45 $ (0.80 ) $ 3.09 $ 0.53 The weighted average number of shares outstanding used in the computation of diluted earnings per share excludes the effect of outstanding common shares potentially issuable totaling 8,899 shares and 13,887 shares at the three month and nine month periods ended September 30, 2017 , respectively, as compared to 330,813 shares and 14,793 shares at the three month and nine month periods ended September 30, 2016 , respectively. These potentially issuable common shares were not included in the calculation of diluted earnings per share because their effect would be anti-dilutive. No shares were repurchased during the three month and nine month periods ended September 30, 2017 and 2016 . We currently have in place a $100 million share repurchase program to mitigate the dilutive effect of shares issued under our stock incentive plans and Employee Stock Purchase Program, and to be used for discretionary share repurchases from time to time. This program was approved by our Board of Directors in August 2014 and will remain open until it has been fully utilized. There is currently no definitive timeline under which the program will be completed. As of September 30, 2017 , we had not yet commenced repurchasing under this program.

Other Accrued and Current Liabi

Other Accrued and Current Liabilities	9 Months Ended
	Sep. 30, 2017
Disclosure Other Accrued And Current Liabilities [Abstract]
Other Accrued and Current Liabilities	Other Accrued and Current Liabilities September 30, December 31, 2016 Restructuring Accruals $ 13.5 $ 10.0 Professional Fees 33.3 39.3 Operating Expenses 46.8 40.2 Other Accrued Liabilities (1) 40.8 65.1 $ 134.4 $ 154.6 (1) The decrease in other accrued liabilities from December 31, 2016 to September 30, 2017 was primarily due to a payment in the first quarter of 2017 for a service-based award related to the acquisition of Dun and Bradstreet Credibility Corp (“DBCC”), a payment to resolve a legal matter (Jeffrey A. Thomas v. DBCC) during the second quarter of 2017 and a decrease in the accrual for the Securities and Exchange Commission (“SEC”) and the United States Department of Justice (“DOJ”) investigation of our China operations during the second quarter of 2017.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2017
Disclosure Contingencies Additional Information [Abstract]
Contingencies	Contingencies We are involved in legal proceedings, claims and litigation arising in the ordinary course of business for which we believe that we have adequate reserves, and such reserves are not material to the consolidated financial statements. We record a liability when management believes that it is both probable that a liability has been incurred and we can reasonably estimate the amount of the loss. For such matters where management believes a liability is not probable but is reasonably possible, a liability is not recorded; instead, an estimate of loss or range of loss, if material individually or in the aggregate, is disclosed if reasonably estimable, or a statement will be made that an estimate of loss cannot be made. Once we have disclosed a matter that we believe is or could be material to us, we continue to report on such matter until there is finality of outcome or until we determine that disclosure is no longer warranted. Further, other than specifically stated below to the contrary, we believe our estimate of the aggregate range of reasonably possible losses, in excess of established reserves, for our legal proceedings was not material at September 30, 2017 . In addition, from time to time, we may be involved in additional matters, which could become material and for which we may also establish reserve amounts, as discussed below. In accordance with ASC 450, “Contingencies,” or “ASC 450,” as of September 30, 2017, we have accrued approximately $12 million with respect to the matters set forth below. China Operations On March 18, 2012, we announced we had temporarily suspended our Shanghai Roadway D&B Marketing Services Co. Ltd. (“Roadway”) operations in China, pending an investigation into allegations that its data collection practices may have violated local Chinese consumer data privacy laws. Thereafter, the Company decided to permanently cease the operations of Roadway. In addition, we have been reviewing certain allegations that we may have violated the Foreign Corrupt Practices Act and certain other laws in our China operations. As previously reported, we have voluntarily contacted the SEC and the DOJ to advise both agencies of our investigation, which has now ended, although we are continuing to meet with representatives of both the SEC and DOJ to fully resolve the matter. On September 28, 2012, Roadway was charged in a Bill of Prosecution, along with five former employees, by the Shanghai District Prosecutor with illegally obtaining private information of Chinese citizens. On December 28, 2012, the Chinese court imposed a monetary fine on Roadway and fines and imprisonment on four former Roadway employees. A fifth former Roadway employee was separated from the case. Although our discussions with both the SEC and DOJ are ongoing, we do not believe that the ultimate outcome will be material to our business, financial condition or results of operations. Based on our discussions with the SEC and DOJ, including indications from the SEC of its estimate of the amount of net benefit potentially earned by the Company as a result of the challenged activities, we continue to believe that it is probable that the Company will incur a loss related to the government’s investigation. We continue to have follow-up meetings with the SEC and DOJ, most recently meeting with the SEC in October 2017 and separately with the DOJ in July 2017. The factual investigation into this matter has concluded. The parties are discussing the potential resolution of this matter, which is expected to be limited to the preparation of related documentation. In accordance with ASC 450, during the second quarter of 2017 we adjusted the amount in respect of this matter that has been accrued in the consolidated financial statements. Dun & Bradstreet Credibility Corp. Class Action Litigations In May 2015, the Company acquired the parent company of DBCC pursuant to a merger transaction and, as a result, assumed all of DBCC’s obligations in the class action litigation matters described below. As described in Note 18 to our consolidated financial statements included in our Annual Report on Form 10-K, a part of the merger consideration was placed in escrow to indemnify the Company against a portion of the losses, if any, arising out of such class action litigation matters, subject to a cap and other conditions. In June 2016, we agreed to release the escrows after the Company was indemnified for $2.0 million out of such escrow accounts. O&R Construction, LLC v. Dun & Bradstreet Credibility Corp., et al., No. 2:12 CV 02184 (TSZ) (W.D. Wash.) On December 13, 2012, plaintiff O&R Construction LLC filed a putative class action in the United States District Court for the Western District of Washington against the Company and DBCC. In May 2015, the Company acquired the parent company of DBCC, Credibility. The complaint alleged, among other things, that defendants violated the antitrust laws, used deceptive marketing practices to sell the CreditBuilder credit monitoring products and allegedly misrepresented the nature, need and value of the products. The plaintiff purports to sue on behalf of a putative class of purchasers of CreditBuilder and seeks recovery of damages and equitable relief. DBCC was served with the complaint on December 14, 2012. The Company was served with the complaint on December 17, 2012. On February 18, 2013, the defendants filed motions to dismiss the complaint. On April 5, 2013, plaintiff filed an amended complaint in lieu of responding to the motion. The amended complaint dropped the antitrust claims and retained the deceptive practices allegations. The defendants filed new motions to dismiss the amended complaint on May 3, 2013. On August 23, 2013, the Court heard the motions and denied DBCC’s motion but granted the Company’s motion. Specifically, the Court dismissed the contract claim against the Company with prejudice, and dismissed all the remaining claims against the Company without prejudice. On September 23, 2013, plaintiff filed a Second Amended Complaint (“SAC”). The SAC alleges claims for negligence, defamation and unfair business practices under Washington state law against the Company for alleged inaccuracies in small business credit reports. The SAC also alleges liability against the Company under a joint venture or agency theory for practices relating to CreditBuilder®. As against DBCC, the SAC alleges claims for negligent misrepresentation, fraudulent concealment, unfair and deceptive acts, breach of contract and unjust enrichment. DBCC filed a motion to dismiss the claims that were based on a joint venture or agency liability theory. The Company filed a motion to dismiss the SAC. On January 9, 2014, the Court heard argument on the defendants’ motions. It dismissed with prejudice the claims against the defendants based on a joint venture or agency liability theory. The Court denied the Company’s motion with respect to the negligence, defamation and unfair practices claims. On January 23, 2014, the defendants answered the SAC. At a court conference on December 17, 2014, plaintiff informed the Court that it would not be seeking to certify a nationwide class, but instead limit the class to CreditBuilder purchasers in Washington. On May 29, 2015, plaintiff filed motions for class certification against the Company and DBCC. On July 29, 2015, Defendants filed oppositions to the motions for class certification. On September 16, 2015, plaintiff filed reply briefs in support of the motions for class certification. At the request of the parties, on October 30, 2015, the Court entered an order striking plaintiff’s class certification motions without prejudice and striking all upcoming deadlines while the parties negotiated a written settlement agreement. On February 11, 2016, the parties entered into a written settlement term sheet, and on May 16, 2016 the parties executed a settlement agreement, which was subject to Court approval. On May 17, 2016, plaintiff filed an Unopposed Motion for Preliminary Approval of the Class Action Settlement. On August 9, 2016, the Court denied plaintiff’s motion without prejudice and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report. On October 14, 2016, the parties entered into an amended settlement agreement, which amended some of the non-monetary terms of the agreement. On the same day, plaintiff filed with the Court the amended settlement agreement together with an unopposed renewed motion for preliminary approval of the amended settlement. On December 22, 2016, the Court denied plaintiff’s renewed motion and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report within 70 days. On March 2, 2017, the parties entered into a second amended settlement agreement. On the same day, plaintiff filed the second amended settlement agreement together with an unopposed renewed motion for preliminary approval of the second amended settlement. On May 5, 2017, the Court entered an order preliminarily certifying the class for settlement; approving the settlement, including the settlement amount, subject to certain changes to the settlement’s notice and administration provisions; and directing Plaintiffs to file supplemental papers addressing the notice and administration issues the Court identified. On August 25, 2017, the parties entered into a third amended stipulation of settlement, and plaintiffs filed a supplemental brief seeking approval of the third amended stipulation of settlement and addressing the issues identified in the Court’s May 5, 2017 order. On October 13, 2017, the Court denied Plaintiff’s motion without prejudice and directed the parties to file within 60 days either a joint status report or a renewed motion for preliminary approval addressing issues identified by the Court regarding the settlement class definition and the allocation of the settlement proceeds. Our ultimate liability related to this matter is contingent upon our insurance coverage and we do not expect the impact will be material to our financial results (see further discussion of Sentry matter below). Die-Mension Corporation v. Dun & Bradstreet Credibility Corp. et al., No. 2:14-cv-00855 (TSZ) (W.D. Wash.) (filed as No. 1:14-cv-392 (N.D. Oh.)) On February 20, 2014, plaintiff Die-Mension Corporation (“Die-Mension”) filed a putative class action in the United States District Court for the Northern District of Ohio against the Company and DBCC, purporting to sue on behalf of a putative class of all purchasers of a CreditBuilder product in the United States or in such state(s) as the Court may certify. The complaint alleged that DBCC used deceptive marketing practices to sell the CreditBuilder credit monitoring products. As against the Company, the complaint alleged a violation of Ohio’s Deceptive Trade Practices Act (“DTPA”), defamation, and negligence. As against DBCC, the complaint alleged violations of the DTPA, negligent misrepresentation and concealment. On March 4, 2014, in response to a direction from the Ohio court, Die-Mension withdrew its original complaint and filed an amended complaint. The amended complaint contains the same substantive allegations as the original complaint, but limits the purported class to small businesses in Ohio that purchased the CreditBuilder product. On March 12, 2014, DBCC agreed to waive service of the amended complaint and on March 13, 2014, the Company agreed to waive service. On May 5, 2014, the Company and DBCC filed a Joint Motion to Transfer the litigation to the Western District of Washington. On June 9, 2014, the Ohio court issued an order granting the Defendants’ Joint Motion to Transfer. On June 22, 2014, the case was transferred to the Western District of Washington. Pursuant to an order entered on December 17, 2014 by the Washington court, this case was coordinated for pre-trial discovery purposes with related cases transferred to the Western District of Washington. On January 6, 2015, the Court entered a stipulation and order setting forth the case management schedule. On January 15, 2015, Defendants filed motions to dismiss the amended complaint. In response, Die-Mension filed a second amended complaint on March 13, 2015. On April 3, 2015, Defendants filed motions to dismiss the second amended complaint, and on May 22, 2015, Die-Mension filed its oppositions to the motions. Defendants filed reply briefs on June 12, 2015. On July 17, 2015, Die-Mension filed motions for class certification against the Company and DBCC. On September 9, 2015, the Washington court entered an order denying the Company’s motion to dismiss, and on September 10, 2015, it entered an order granting DBCC’s motion to dismiss without prejudice. At the request of the parties, on October 30, 2015, the Court entered an order striking plaintiff’s class certification motions without prejudice and striking all upcoming deadlines while the parties negotiated a written settlement agreement. On February 11, 2016, the parties entered into a written settlement term sheet, and on May 16, 2016, the parties executed a settlement agreement, which was subject to Court approval. On May 17, 2016, plaintiff filed an Unopposed Motion for Preliminary Approval of the Class Action Settlement. On August 9, 2016, the Court denied plaintiff’s motion without prejudice and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report. On October 14, 2016, the parties entered into an amended settlement agreement, which amended some of the non-monetary terms of the agreement. On the same day, plaintiff filed with the Court the amended settlement agreement together with an unopposed renewed motion for preliminary approval of the amended settlement. On December 22, 2016, the Court denied plaintiff’s renewed motion and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report within 70 days. On March 2, 2017, the parties entered into a second amended settlement agreement. On the same day, plaintiff filed the second amended settlement agreement together with an unopposed renewed motion for preliminary approval of the second amended settlement. On May 5, 2017, the Court entered an order preliminarily certifying the class for settlement; approving the settlement, including the settlement amount, subject to certain changes to the settlement’s notice and administration provisions; and directing Plaintiffs to file supplemental papers addressing the notice and administration issues the Court identified. On August 25, 2017, the parties entered into a third amended stipulation of settlement, and plaintiffs filed a supplemental brief seeking approval of the third amended stipulation of settlement and addressing the issues identified in the Court’s May 5, 2017 order. On October 13, 2017, the Court denied Plaintiff’s motion without prejudice and directed the parties to file within 60 days either a joint status report or a renewed motion for preliminary approval addressing issues identified by the Court regarding the settlement class definition and the allocation of the settlement proceeds. Our ultimate liability related to this matter is contingent upon our insurance coverage and we do not expect the impact will be material to our financial results (see further discussion of Sentry matter below). Vinotemp International Corporation and CPrint®, Inc. v. Dun & Bradstreet Credibility Corp., et al., No. 2:14-cv-01021 (TSZ) (W.D. Wash.) (filed as No. 8:14-cv-00451 (C.D. Cal.)) On March 24, 2014, plaintiffs Vinotemp International Corporation (“Vinotemp”) and CPrint®, Inc. (“CPrint”) filed a putative class action in the United States District Court for the Central District of California against the Company and DBCC. Vinotemp and CPrint purport to sue on behalf of all purchasers of DBCC’s CreditBuilder product in the state of California. The complaint alleges that DBCC used deceptive marketing practices to sell the CreditBuilder credit monitoring products, in violation of §17200 and §17500 of the California Business and Professions Code. The complaint also alleges negligent misrepresentation and concealment against DBCC. As against the Company, the complaint alleges that the Company entered false and inaccurate information on credit reports in violation of §17200 of the California Business and Professions Code, and also alleges negligence and defamation claims. On March 31, 2014, the Company agreed to waive service of the complaint and on April 2, 2014, DBCC agreed to waive service. On June 13, 2014, the Company and DBCC filed a Joint Unopposed Motion to Transfer the litigation to the Western District of Washington. On July 2, 2014, the California court granted the Defendants’ Joint Motion to Transfer, and on July 8, 2014, the case was transferred to the Western District of Washington. Pursuant to an order entered on December 17, 2014 by the Washington court, this case was coordinated for pre-trial discovery purposes with related cases transferred to the Western District of Washington. On January 6, 2015, the Court entered a stipulation and order setting forth the case management schedule. On January 15, 2015, Defendants filed motions to dismiss the complaint. In response, plaintiffs filed an amended complaint on March 13, 2015. On April 3, 2015, Defendants filed motions to dismiss the amended complaint, and on May 22, 2015, plaintiffs filed their oppositions to the motions. Defendants filed reply briefs on June 12, 2015. On July 17, 2015, Plaintiffs filed motions for class certification against the Company and DBCC. On September 9, 2015, the Washington court entered an order denying the Company’s motion to dismiss. At the request of the parties, on October 30, 2015, the Court entered an order striking plaintiff’s class certification motions and DBCC’s motion to dismiss without prejudice and striking all upcoming deadlines while the parties negotiated a written settlement agreement. On February 11, 2016, the parties entered into a written settlement term sheet, and on May 16, 2016, the parties executed a settlement agreement, which was subject to Court approval. On May 17, 2016, plaintiffs filed an Unopposed Motion for Preliminary Approval of the Class Action Settlement. On August 9, 2016, the Court denied plaintiffs’ motion without prejudice and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report. On October 14, 2016, the parties entered into an amended settlement agreement, which amended some of the non-monetary terms of the agreement. On the same day, plaintiffs filed with the Court the amended settlement agreement together with an unopposed renewed motion for preliminary approval of the amended settlement. On December 22, 2016, the Court denied plaintiffs’ renewed motion and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report within 70 days. On March 2, 2017, the parties entered into a second amended settlement agreement. On the same day, plaintiff filed the second amended settlement agreement together with an unopposed renewed motion for preliminary approval of the second amended settlement. On May 5, 2017, the Court entered an order preliminarily certifying the class for settlement; approving the settlement, including the settlement amount, subject to certain changes to the settlement’s notice and administration provisions; and directing Plaintiffs to file supplemental papers addressing the notice and administration issues the Court identified. On August 25, 2017, the parties entered into a third amended stipulation of settlement, and plaintiffs filed a supplemental brief seeking approval of the third amended stipulation of settlement and addressing the issues identified in the Court’s May 5, 2017 order. On October 13, 2017, the Court denied Plaintiffs’ motion without prejudice and directed the parties to file within 60 days either a joint status report or a renewed motion for preliminary approval addressing issues identified by the Court regarding the settlement class definition and the allocation of the settlement proceeds. Our ultimate liability related to this matter is contingent upon our insurance coverage and we do not expect the impact will be material to our financial results (see further discussion of Sentry matter below). Flow Sciences Inc. v. Dun & Bradstreet Credibility Corp., et al., No. 2:14-cv-01404 (TSZ) (W.D. Wash.) (filed as No. 7:14-cv-128 (E.D.N.C.)) On June 13, 2014, plaintiff Flow Sciences Inc. (“Flow Sciences”) filed a putative class action in the United States District Court for the Eastern District of North Carolina against the Company and DBCC. Flow Sciences purports to sue on behalf of all purchasers of DBCC’s CreditBuilder product in the state of North Carolina. The complaint alleges that the Company and DBCC engaged in deceptive practices in connection with DBCC’s sale of the CreditBuilder credit monitoring products, in violation of North Carolina’s Unfair Trade Practices Act, N.C. Gen. Stat. § 75-1.1 et seq. In addition, as against the Company, the complaint alleges negligence and defamation claims. The complaint also alleges negligent misrepresentation and concealment against DBCC. On June 18, 2014, DBCC agreed to waive service of the complaint and on June 26, 2014, the Company agreed to waive service of the complaint. On August 4, 2014, the Company and DBCC filed a Joint Unopposed Motion to Transfer the litigation to the Western District of Washington. On September 8, 2014, the North Carolina court granted the motion to transfer, and on September 9, 2014, the case was transferred to the Western District of Washington. Pursuant to an order entered on December 17, 2014 by the Washington court, this case was coordinated for pre-trial discovery purposes with related cases transferred to the Western District of Washington. On January 6, 2015, the Court entered a stipulation and order setting forth the case management schedule. On January 15, 2015, Defendants filed motions to dismiss the complaint. In response, Flow Sciences filed an amended complaint on March 13, 2015. On April 3, 2015, Defendants filed motions to dismiss the amended complaint, and on May 22, 2015, Flow Science filed its oppositions to the motions. Defendants filed reply briefs on June 12, 2015. On July 17, 2015, Flow Sciences filed motions for class certification against the Company and DBCC. On September 9, 2015, the Washington court entered an order denying the Company’s motion to dismiss and on October 19, 2015, it entered an order denying DBCC’s motion to dismiss. At the request of the parties, on October 30, 2015, the Court entered an order striking plaintiff’s class certification motions without prejudice and striking all upcoming deadlines while the parties negotiated a written settlement agreement. On February 11, 2016, the parties entered into a written settlement term sheet, and on May 16, 2016, the parties executed a settlement agreement, which was subject to Court approval. On May 17, 2016, plaintiff filed an Unopposed Motion for Preliminary Approval of the Class Action Settlement. On August 9, 2016, the Court denied plaintiff’s motion without prejudice and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report. On October 14, 2016, the parties entered into an amended settlement agreement, which amended some of the non-monetary terms of the agreement. On the same day, plaintiff filed with the Court the amended settlement agreement together with an unopposed renewed motion for preliminary approval of the amended settlement. On December 22, 2016, the Court denied plaintiff’s renewed motion and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report within 70 days. On March 2, 2017, the parties entered into a second amended settlement agreement. On the same day, plaintiff filed the second amended settlement agreement together with an unopposed renewed motion for preliminary approval of the second amended settlement. On May 5, 2017, the Court entered an order preliminarily certifying the class for settlement; approving the settlement, including the settlement amount, subject to certain changes to the settlement’s notice and administration provisions; and directing Plaintiffs to file supplemental papers addressing the notice and administration issues the Court identified. On August 25, 2017, the parties entered into a third amended stipulation of settlement, and plaintiffs filed a supplemental brief seeking approval of the third amended stipulation of settlement and addressing the issues identified in the Court’s May 5, 2017 order. On October 13, 2017, the Court denied Plaintiff’s motion without prejudice and directed the parties to file within 60 days either a joint status report or a renewed motion for preliminary approval addressing issues identified by the Court regarding the settlement class definition and the allocation of the settlement proceeds. Our ultimate liability related to this matter is contingent upon our insurance coverage and we do not expect the impact will be material to our financial results (see further discussion of Sentry matter below). Altaflo, LLC v. Dun & Bradstreet Credibility Corp., et al., No. 2:14-cv-01288 (TSZ) (W.D. Wash.) (filed as No. 2:14-cv-03961 (D.N.J.)) On June 20, 2014, plaintiff Altaflo, LLC (“Altaflo”) filed a putative class action in the United States District Court for the District of New Jersey against the Company and DBCC. Altaflo purports to sue on behalf of all purchasers of DBCC’s CreditBuilder product in the state of New Jersey. The complaint alleges that the Company and DBCC engaged in deceptive practices in connection with DBCC’s sale of the CreditBuilder credit monitoring products, in violation of the New Jersey Consumer Fraud Act, N.J. Stat. § 56:8-1 et seq. In addition, as against the Company, the complaint alleges negligence and defamation claims. The complaint also alleges negligent misrepresentation and concealment against DBCC. On June 26, 2014, the Company agreed to waive service of the complaint, and on July 2, 2014, DBCC agreed to waive service. On July 29, 2014, the Company and DBCC filed a Joint Unopposed Motion to Transfer the litigation to the Western District of Washington. On July 31, 2014, the New Jersey court granted the Defendants’ Joint Motion to Transfer, and the case was transferred to the Western District of Washington on August 20, 2014. Pursuant to an order entered on December 17, 2014 by the Washington court, this case was coordinated for pre-trial discovery purposes with related cases transferred to the Western District of Washington. On January 6, 2015, the Court entered a stipulation and order setting forth the case management schedule. On January 15, 2015, Defendants filed motions to dismiss the complaint. In response, Altaflo filed an amended complaint on March 13, 2015. On April 3, 2015, Defendants filed motions to dismiss the amended complaint, and on May 22, 2015, Altaflo filed its oppositions to the motions. Defendants filed reply briefs on June 12, 2015. On July 17, 2015, Altaflo filed motions for class certification against the Company and DBCC. On September 9, 2015, the Washington court entered an order denying the Company’s motion to dismiss, and on October 19, 2015, it entered an order granting DBCC’s motion to dismiss without prejudice. At the request of the parties, on October 30, 2015, the Court entered an order striking plaintiff’s class certification motions without prejudice and striking all upcoming deadlines while the parties negotiated a written settlement agreement. On February 11, 2016, the parties entered into a written settlement term sheet, and on May 16, 2016, the parties executed a settlement agreement, which was subject to Court approval. On May 17, 2016, plaintiff filed an Unopposed Motion for Preliminary Approval of the Class Action Settlement. On August 9, 2016, the Court denied plaintiff’s motion without prejudice and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report. On October 14, 2016, the parties entered into an amended settlement agreement, which amended some of the non-monetary terms of the agreement. On the same day, plaintiff filed with the Court the amended settlement agreement together with an unopposed renewed motion for preliminary approval of the amended settlement. On December 22, 2016, the Court denied plaintiff’s renewed motion and directed the parties to file either a renewed motion for preliminary approval of the class action settlement or a joint status report within 70 days. On March 2, 2017, the parties entered into a second amended settlement agreement. On the same day, plaintiff filed the second amended settlement agreement together with an unopposed renewed motion for preliminary approval of the second amended settlement. On May 5, 2017, the Court entered an order preliminarily certifying the class for settlement; approving the settlement, including the settlement amount, subject to certain changes to the settlement’s notice and administration provisions; and directing Plaintiffs to file supplemental papers addressing the notice and administration issues the Court identified. On August 25, 2017, the parties entered into a third amended stipulation of settlement, and plaintiffs filed a supplemental brief seeking approval of the third amended stipulation of settlement and addressing the issues identified in the Court’s May 5, 2017 order. On October 13, 2017, the Court denied Plaintiff’s motion without prejudice and directed the parties to file within 60 days either a joint status report or a renewed motion for preliminary approval addressing issues identified by the Court regarding the settlement class definition and the allocation of the settlement proceeds. Our ultimate liability related to this matter is contingent upon our insurance coverage and we do not expect the impact will be material to our financial results (see further discussion of Sentry matter below). Sentry Insurance, a Mutual Company v. The Dun & Bradstreet Corporation and Dun & Bradstreet, Inc., No. 2:15-cv-01952 (SRC) (D.N.J.) On March 17, 2015, Sentry Insurance filed a Declaratory Judgment Action in the United States District Court for the District of New Jersey against The Dun & Bradstreet Corporation and Dun & Bradstreet, Inc. (collectively, “Dun & Bradstreet”). The Complaint seeks a judicial declaration that Sentry, which issued a General Commercial Liability insurance policy (the “CGL Policy”), to Dun & Bradstreet, does not have a duty under the CGL Policy to provide Dun & Bradstreet with a defense or indemnification in connection with five putative class action complaints (the “Class Actions”) filed against Dun & Bradstreet and DBCC. Against Dun & Bradstreet, the Class Actions complaints allege negligence, defamation and violations of state laws prohibiting unfair and deceptive practices in connection with DBCC’s marketing and sale of credit monitoring products. Sentry’s Complaint alleges that Dun & Bradstreet is not entitled to a defense or indemnification for any losses it sustains in the Class Actions because the underlying claims in the Class Actions fall within various exceptions in the CGL policy, including exclusions for claims: (i) that arise from Dun and Bradstreet’s provision of “professional services”; (ii) that are based on intentional or fraudulent acts; and (iii) that are based on conduct that took place prior to the beginning of the CGL Policy periods. We do not believe the exclusions are applicable under governing law interpreting similar provisions. On March 26, 2015, Sentry filed and served an Amended Complaint which added several exhibits but did not otherwise materially differ from the original Complaint. Dun & Bradstreet filed an Answer to the Amended Complaint on April 16, 2015 and also asserted counterclaims. The coverage litigation was then temporarily stayed while the parties engaged in informal settlement discussions which did not resolve the matter. On June 30, 2016, Dun & Bradstreet filed a motion to join National Union Fire Insurance Company of Pittsburgh (“National Union”) as an additional party due to National Union

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended September 30, 2017, our effective tax rate was 30.5% as compared to (243.2)% for the three months ended September 30, 2016, resulting from the prior year period pre-tax loss of $8.2 million which was primarily due to the divestiture of Benelux and Latin America (see Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q). The improvement of the effective tax rate for the 2017 period compared to the prior year period was primarily due to: (i) the negative effect to the effective tax rate in 2016 attributable to the loss on the divestiture of our operations in Benelux and Latin America, most of which was as a result of the release of a cumulative foreign currency translation loss, that is not deductible for tax purposes; partially offset by (ii) a lower tax benefit in the 2017 period associated with the release of reserves for uncertain tax positions primarily as a result of the expiration of statute of limitations. For the three months ended September 30, 2017, there are no known changes in our effective tax rate that either have had or that we expect may reasonably have a material impact on our operations or future performance. For the nine months ended September 30, 2017, our effective tax rate was 30.5% as compared to 68.4% for the nine months ended September 30, 2016. The lower effective tax rate for 2017 was primarily attributable to: (i) the loss in the prior year period on the divestiture of our operations in Benelux and Latin America, most of which was as a result of the release of a cumulative foreign currency translation loss, that is not deductible for tax purposes and (ii) higher non-taxable income in the current year period and a higher non-deductible expense in the prior year period, both related to the legal reserve associated with the SEC and DOJ investigation of our China operations; partially offset by (iii) a lower tax benefit recognized in the current year period associated with the release of reserves for uncertain tax positions primarily as a result of the expiration of statute of limitations. For the nine months ended September 30, 2017, there are no known changes in our effective tax rate that either have had or that we expect may reasonably have a material impact on our operations or future performance. The total amount of gross unrecognized tax benefits as of September 30, 2017 was $7.3 million . The amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate is $6.8 million , net of related tax benefits. We or one of our subsidiaries file income tax returns in the U.S. federal, and various state, local and foreign jurisdictions. In the U.S. federal jurisdiction, we are no longer subject to examination by the Internal Revenue Service (“IRS”) for years prior to 2014. In state and local jurisdictions, with a few exceptions, we are no longer subject to examinations by tax authorities for years prior to 2012. In foreign jurisdictions, with a few exceptions, we are no longer subject to examinations by tax authorities for years prior to 2011. We recognize accrued interest expense related to unrecognized tax benefits in income tax expense. The total amount of interest expense recognized for the three month and nine month periods ended September 30, 2017 was $0.1 million and $0.2 million , respectively, net of tax benefits, as compared to $0.1 million and $0.3 million , net of tax benefits, for the three month and nine month periods ended September 30, 2016, respectively. The total amount of accrued interest as of September 30, 2017 was $0.4 million , net of tax benefits, as compared to $0.2 million , net of tax benefits, as of September 30, 2016.

Pension and Postretirement Bene

Pension and Postretirement Benefits	9 Months Ended
	Sep. 30, 2017
Disclosure Pension And Postretirement Benefits Additional Information [Abstract]
Pension and Postretirement Benefits	Pension and Postretirement Benefits The following table sets forth the components of the net periodic cost (income) associated with our pension plans and our postretirement benefit obligations: Pension Plans Postretirement Benefit Obligations For the Three Months Ended September 30, For the Nine Months Ended September 30, For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 2017 2016 2017 2016 Components of Net Periodic Cost (Income): Service Cost $ 0.7 $ 0.8 $ 2.1 $ 2.3 $ 0.1 $ 0.1 $ 0.5 $ 0.5 Interest Cost 14.9 15.1 43.4 44.9 0.1 0.1 0.3 0.3 Expected Return on Plan Assets (23.6 ) (23.9 ) (70.5 ) (72.5 ) — — — — Amortization of Prior Service Cost (Credit) 0.1 0.1 0.2 0.2 (0.2 ) (0.4 ) (0.8 ) (1.2 ) Recognized Actuarial Loss (Gain) 10.0 9.7 30.0 29.0 (0.5 ) (0.3 ) (1.1 ) (1.1 ) Net Periodic Cost (Income) $ 2.1 $ 1.8 $ 5.2 $ 3.9 $ (0.5 ) $ (0.5 ) $ (1.1 ) $ (1.5 ) We previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2016 that we expected to contribute approximately $29 million to our U.S. Non-Qualified plans and non-U.S. pension plans and approximately $2 million to our postretirement benefit plan for the year ended December 31, 2017 . As of September 30, 2017 , we have made contributions to our U.S. Non-Qualified and non-U.S. pension plans of $23.7 million and we have made contributions of $1.0 million to our postretirement benefit plan.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The operating segments reported below are our segments for which separate financial information is available and upon which operating results are evaluated by management on a timely basis to assess performance and to allocate resources. We manage and report our business through two segments: • Americas, which consists of our operations in the U.S., Canada, and our Latin America Worldwide Network (we divested our Latin America operations in September 2016); and • Non-Americas, which consists of our operations in the U.K., Greater China, India and our European and Asia Pacific Worldwide Network (we divested our operations in Benelux in November 2016 and our Australian operations in June 2015). Our customer solution sets are D&B Risk Management Solutions™ and D&B Sales & Marketing Solutions™. Inter-segment sales are immaterial, and no single customer accounted for 10% or more of our total revenue. For management reporting purposes, we evaluate business segment performance before intercompany transactions and restructuring charges, as well as certain other costs, because these charges are not considered as part of our ongoing income or expenses and may have a disproportionate positive or negative impact on the results of our ongoing underlying business. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Revenue: Americas $ 352.0 $ 338.8 $ 1,000.1 $ 974.9 Non-Americas 76.3 74.0 215.4 211.7 Consolidated Total $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 Operating Income: Americas $ 99.7 $ 100.6 $ 233.5 $ 253.9 Non-Americas 23.4 20.0 62.8 47.2 Total Segments 123.1 120.6 296.3 301.1 Corporate and Other (1) (27.9 ) (23.8 ) (83.8 ) (104.6 ) Consolidated Total 95.2 96.8 212.5 196.5 Non-Operating Income (Expense) - Net (2) (15.7 ) (105.0 ) (44.6 ) (130.6 ) Income (Loss) Before Provision for Income Taxes and Equity in Net Income of Affiliates $ 79.5 $ (8.2 ) $ 167.9 $ 65.9 (1) The following table summarizes “Corporate and Other:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Corporate Costs $ (21.9 ) $ (20.0 ) $ (64.6 ) $ (57.5 ) Restructuring Expense (5.8 ) (3.2 ) (22.3 ) (18.8 ) Acquisition-Related Costs (a) (0.2 ) (0.2 ) (4.8 ) (0.8 ) Decrease/(Increase) of Accrual for Legal Matters (b) — — 8.0 (26.0 ) Legal and Other Professional Fees and Shut-Down (Costs) Recoveries Related to Matters in China — (0.4 ) (0.1 ) (1.5 ) Total Corporate and Other $ (27.9 ) $ (23.8 ) $ (83.8 ) $ (104.6 ) (a) The acquisition-related costs (e.g., banker's fees) for the three month and nine month periods ended September 30, 2017 were primarily related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q. (b) The decrease in the accrued expenses for legal matters for the nine months ended September 30, 2017 was related to the SEC and DOJ investigation of our China operations. The accrued expenses for legal matters for the nine months ended September 30, 2016 is related to litigation (Jeffrey A. Thomas v. DBCC), net of an indemnification from the DBCC acquisition escrows, and the SEC and DOJ investigation of our China operations. (2) The following table summarizes “Non-Operating Income (Expense) - Net:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Interest Income $ 0.4 $ 0.4 $ 1.2 $ 1.4 Interest Expense (15.2 ) (13.2 ) (44.9 ) (40.1 ) Other Income (Expense) - Net (a) (0.9 ) (92.2 ) (0.9 ) (91.9 ) Non-Operating Income (Expense) - Net $ (15.7 ) $ (105.0 ) $ (44.6 ) $ (130.6 ) (a) The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q. Supplemental Geographic and Customer Solution Set Information: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Customer Solution Set Revenue: Americas: Risk Management Solutions $ 202.6 $ 203.6 $ 567.9 $ 565.4 Sales & Marketing Solutions 149.4 135.2 432.2 409.5 Total Americas Revenue $ 352.0 $ 338.8 $ 1,000.1 $ 974.9 Non-Americas: Risk Management Solutions $ 60.2 $ 60.3 $ 171.9 $ 175.0 Sales & Marketing Solutions 16.1 13.7 43.5 36.7 Total Non-Americas Revenue $ 76.3 $ 74.0 $ 215.4 $ 211.7 Consolidated Total: Risk Management Solutions $ 262.8 $ 263.9 $ 739.8 $ 740.4 Sales & Marketing Solutions 165.5 148.9 475.7 446.2 Consolidated Total Revenue $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 At September 30, 2017 At December 31, 2016 Assets: Americas (3) $ 1,409.7 $ 1,432.6 Non-Americas (4) 698.4 555.9 Total Segments 2,108.1 1,988.5 Corporate and Other (5) 192.9 220.7 Consolidated Total $ 2,301.0 $ 2,209.2 Goodwill: Americas $ 633.5 $ 550.6 Non-Americas 141.1 101.3 Consolidated Total (6) $ 774.6 $ 651.9 (3) Total assets in the Americas segment at September 30, 2017 decreased by $22.9 million compared to December 31, 2016, primarily driven by a decrease in accounts receivable resulting from the cyclical sales pattern of our Americas business and a decrease in other intangible assets due to normal amortization, partially offset by an increase in total assets as the result of the acquisition of Avention in the first quarter of 2017 (see Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q), and an increase in computer software due to software-related enhancements on products. (4) Total assets in the Non-Americas segment at September 30, 2017 increased by $142.5 million compared to December 31, 2016, primarily driven by a net increase in cash as a result of the cyclical pattern of collections in the segment, an increase due to the acquisition of Avention in the first quarter of 2017, and the positive impact of foreign currency translation. (5) Total assets in Corporate and Other at September 30, 2017 decreased by $27.8 million compared to December 31, 2016, primarily driven by a net decrease in cash and a decrease in net deferred tax assets due to the acquisition of Avention. (6) Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2017
Disclosure Financial Instruments Additional Information [Abstract]
Financial Instruments	Financial Instruments We employ established policies and procedures to manage our exposure to changes in interest rates and foreign currencies. We use foreign exchange forward and option contracts to hedge short-term foreign currency denominated loans and certain third-party and intercompany transactions. We may also use foreign exchange forward contracts to hedge our net investments in our foreign subsidiaries. In addition, we may use interest rate derivatives to hedge a portion of the interest rate exposure on our outstanding debt or in anticipation of a future debt issuance, as discussed under “Interest Rate Risk Management” below. We do not use derivative financial instruments for trading or speculative purposes. If a hedging instrument ceases to qualify as a hedge in accordance with hedge accounting guidelines, any subsequent gains and losses are recognized currently in income. Collateral is generally not required for these types of instruments. By their nature, all such instruments involve risk, including the credit risk of non-performance by counterparties. However, at September 30, 2017 and December 31, 2016 , there was no significant risk of loss in the event of non-performance of the counterparties to these financial instruments. We control our exposure to credit risk through monitoring procedures. Our trade receivables do not represent a significant concentration of credit risk at September 30, 2017 and December 31, 2016 , because we sell to a large number of customers in different geographical locations and industries. Interest Rate Risk Management Our objective in managing our exposure to interest rates is to limit the impact of interest rate changes on our earnings, cash flows and financial position, and to lower our overall borrowing costs. To achieve these objectives, we maintain a policy that floating-rate debt be managed within a minimum and maximum range of our total debt exposure. To manage our exposure and limit volatility, we may use fixed-rate debt, floating-rate debt and/or interest rate swaps. We recognize all derivative instruments as either assets or liabilities at fair value in the statement of financial position. As of September 30, 2017 and December 31, 2016 , we did not have any interest rate derivatives outstanding. Foreign Exchange Risk Management Our objective in managing exposure to foreign currency fluctuations is to reduce the volatility caused by foreign exchange rate changes on the earnings, cash flows and financial position of our international operations. We follow a policy of hedging balance sheet positions denominated in currencies other than the functional currency applicable to each of our various subsidiaries. In addition, we are subject to foreign exchange risk associated with our international earnings and net investments in our foreign subsidiaries. We use short-term, foreign exchange forward and, from time to time, option contracts to execute our hedging strategies. Typically, these contracts have maturities of 12 months or less. These contracts are denominated primarily in the British pound sterling, the Euro, the Canadian dollar and the Hong Kong dollar. The gains and losses on the forward contracts associated with our balance sheet positions are recorded in “Other Income (Expense) – Net” in the unaudited consolidated statements of operations and comprehensive income and are essentially offset by the losses and gains on the underlying foreign currency transactions. Our foreign exchange forward contracts are not designated as hedging instruments under authoritative guidance. As in prior years, we have hedged substantially all balance sheet positions denominated in a currency other than the functional currency applicable to each of our various subsidiaries with short-term, foreign exchange forward contracts. In addition, we may use foreign exchange forward contracts to hedge certain net investment positions. The underlying transactions and the corresponding foreign exchange forward contracts are marked-to-market at the end of each quarter and the fair value impacts are reflected within the unaudited consolidated financial statements. As of September 30, 2017 and December 31, 2016 , the notional amounts of our foreign exchange contracts were $275.4 million and $280.1 million , respectively. Fair Values of Derivative Instruments in the Consolidated Balance Sheet Asset Derivatives Liability Derivatives September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives not designated as hedging instruments Foreign exchange forward contracts Other Current Assets $ 1.3 Other Current Assets $ 1.5 Other Accrued & Current Liabilities $ 1.4 Other Accrued & Current Liabilities $ 1.4 Total derivatives not designated as hedging instruments $ 1.3 $ 1.5 $ 1.4 $ 1.4 Total Derivatives $ 1.3 $ 1.5 $ 1.4 $ 1.4 Our foreign exchange forward contracts are not designated as hedging instruments under authoritative guidance. The Effect of Derivative Instruments on the Consolidated Statement of Operations and Comprehensive Income (Loss) Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Foreign exchange forward contracts Non-Operating Income (Expenses) – Net $ 3.8 $ 0.9 $ 8.6 $ (5.9 ) Fair Value of Financial Instruments Our financial assets and liabilities that are reflected in the consolidated financial statements include derivative financial instruments, cash and cash equivalents, accounts receivable, other receivables, accounts payable, short-term borrowings and long-term borrowings. We use short-term foreign exchange forward contracts to hedge short-term foreign currency-denominated intercompany loans and certain third-party and intercompany transactions. Fair value for derivative financial instruments is determined utilizing a market approach. We have a process for determining fair values. Fair value is based upon quoted market prices, where available. If listed prices or quotes are not available, we use quotes from independent pricing vendors based on recent trading activity and other relevant information including market interest rate curves and referenced credit spreads. In addition to utilizing external valuations, we conduct our own internal assessment of the reasonableness of the external valuations by utilizing a variety of valuation techniques including Black-Scholes option pricing and discounted cash flow models that are consistently applied. Inputs to these models include observable market data, such as yield curves, and foreign exchange rates where applicable. Our assessments are designed to identify prices that do not accurately reflect the current market environment, those that have changed significantly from prior valuations and other anomalies that may indicate that a price may not be accurate. We also follow established routines for reviewing and reconfirming valuations with the pricing provider, if deemed appropriate. In addition, the pricing provider has an established challenge process in place for all valuations, which facilitates identification and resolution of potentially erroneous prices. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments include amounts to reflect counterparty credit quality and our own creditworthiness and constraints on liquidity. For inactive markets that do not have observable pricing or sufficient trading volumes, or for positions that are subject to transfer restrictions, valuations are adjusted to reflect illiquidity and/or non-transferability. Such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. The following table presents information about our assets and liabilities measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016 , and indicates the fair value hierarchy of the valuation techniques utilized by us to determine such fair value. Level inputs, as defined by authoritative guidance, are as follows: Level Input: Input Definition: Level I Observable inputs utilizing quoted prices (unadjusted) for identical assets or liabilities in active markets at the measurement date. Level II Inputs other than quoted prices included in Level I that are either directly or indirectly observable for the asset or liability through corroboration with market data at the measurement date. Level III Unobservable inputs for the asset or liability in which little or no market data exists therefore requiring management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. The following table summarizes fair value measurements by level at September 30, 2017 for assets and liabilities measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level I) Significant Other Observable Inputs (Level II) Significant Unobservable Inputs (Level III) Balance at September 30, 2017 Assets: Cash Equivalents (1) $ 208.2 $ — $ — $ 208.2 Other Current Assets: Foreign Exchange Forwards (2) $ — $ 1.3 $ — $ 1.3 Liabilities: Other Accrued and Current Liabilities: Foreign Exchange Forwards (2) $ — $ 1.4 $ — $ 1.4 (1) Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less. (2) Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation. There were no transfers between Levels I and II for the nine months ended September 30, 2017 . There were no transfers in or transfers out of Level III in the fair value hierarchy for the nine months ended September 30, 2017 . The following table summarizes fair value measurements by level at December 31, 2016 for assets and liabilities measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level I) Significant Other Observable Inputs (Level II) Significant Unobservable Inputs (Level III) Balance at December 31, 2016 Assets: Cash Equivalents (1) $ 238.3 $ — $ — $ 238.3 Other Current Assets: Foreign Exchange Forwards (2) $ — $ 1.5 $ — $ 1.5 Liabilities: Other Accrued and Current Liabilities: Foreign Exchange Forwards (2) $ — $ 1.4 $ — $ 1.4 Contingent Consideration (3) $ — $ — $ — $ — Other Non-Current Liabilities: Contingent Consideration (3) $ — $ — $ — $ — (1) Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less. (2) Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation. (3) Relates to our contingent consideration liability associated with the acquisition of DBCC in the second quarter of 2015. In October 2016, there was an amendment to the Earnout Agreement, replacing it with a service-based award. As a result, in the fourth quarter of 2016, we reversed the balance of the contingent consideration liability of $9.1 million and accrued $14.0 million related to the service-based award associated with 2016. Both adjustments were reflected in “Operating Costs” in our Americas segment in the fourth quarter of 2016. See Note 18 to the consolidated financial statements included in our Annual Report on Form 10-K for further detail. There were no transfers between Levels I and II for the year ended December 31, 2016 . There were no transfers in or transfers out of Level III in the fair value hierarchy for the year ended December 31, 2016 . At September 30, 2017 and December 31, 2016 , the fair value of cash and cash equivalents, accounts receivable, other receivables and accounts payable approximated carrying value due to the short-term nature of these instruments. The estimated fair values of other financial instruments subject to fair value disclosures, determined based on valuation models using discounted cash flow methodologies with market data inputs from globally recognized data providers and third-party quotes from major financial institutions (categorized as Level II in the fair value hierarchy), are as follows: Balance at September 30, 2017 December 31, 2016 Carrying Amount (Asset) Liability Fair Value (Asset) Liability Carrying Amount (Asset) Liability Fair Value (Asset) Liability Short-term and Long-term Debt $ 1,045.0 $ 1,076.6 $ 1,043.5 $ 1,063.1 Revolving Credit Facility $ 277.6 $ 276.8 $ 199.8 $ 200.2 Term Loan Facility $ 359.0 $ 363.3 $ 373.7 $ 383.6 Items Measured at Fair Value on a Nonrecurring Basis In addition to assets and liabilities that are recorded at fair value on a recurring basis, we are required to record assets and liabilities at fair value on a nonrecurring basis as required by GAAP. Generally, assets are recorded at fair value on a nonrecurring basis as a result of impairment charges. During the three month and nine month periods ended September 30, 2017, we recorded an impairment charge of $1.1 million in Corporate and Other related to certain software assets for our corporate back-office systems as a result of our decision to use alternative technology. We determined that the fair value of the assets was zero as there was no alternative use. The charge was included in “Selling and Administrative Expenses” in the unaudited consolidated statement of operations. During the three month and nine month periods ended September 30, 2016, we recorded a loss of $89.6 million related to the divestiture of our operations in Benelux and Latin America. Both businesses were classified as assets held for sale at September 30, 2016 and were measured at the lower of their carrying amount or fair value less cost to sell based on Level II inputs. During the first quarter of 2017, we recorded an additional pre-tax loss of $0.7 million reflecting the final working capital adjustment for the sale of the Benelux businesses. The loss was recorded in “Other Income (Expense) - Net” in the unaudited consolidated statements of operations. See Note 14 to the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q for further detail.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table summarizes the changes in the accumulated balances for each component of accumulated other comprehensive income (“AOCI”) as of September 30, 2017 and 2016 : Foreign Currency Translation Adjustments Defined Benefit Pension Plans Total Balance, December 31, 2015 $ (291.7 ) $ (673.8 ) $ (965.5 ) Other Comprehensive Income Before Reclassifications (41.1 ) (3.9 ) (45.0 ) Amounts Reclassified From Accumulated Other Comprehensive Income, net of tax 45.8 17.7 63.5 Balance, September 30, 2016 $ (287.0 ) $ (660.0 ) $ (947.0 ) Balance, December 31, 2016 $ (266.2 ) $ (683.4 ) $ (949.6 ) Other Comprehensive Income Before Reclassifications 35.7 (3.9 ) 31.8 Amounts Reclassified From Accumulated Other Comprehensive Income, net of tax — 18.8 18.8 Balance, September 30, 2017 $ (230.5 ) $ (668.5 ) $ (899.0 ) The following table summarizes the reclassifications out of AOCI as of September 30, 2017 and 2016 : Details About Accumulated Other Comprehensive Income Components Affected Line Item in the Statement Where Net Income is Presented Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Foreign Currency Translation Adjustments: Sale of Business Other Income (Expense) – Net $ — $ 45.8 $ — $ 45.8 Defined Benefit Pension Plans: Amortization of Prior Service Costs Selling and Administrative Expenses $ (0.1 ) $ (0.3 ) $ (0.4 ) $ (0.7 ) Operating Expenses — (0.1 ) (0.2 ) (0.3 ) Amortization of Actuarial Gain/Loss Selling and Administrative Expenses 6.2 6.4 18.8 18.8 Operating Expenses 3.4 3.1 10.2 9.1 Total Before Tax 9.5 9.1 28.4 26.9 Tax (Expense) or Benefit (3.0 ) (3.0 ) (9.6 ) (9.2 ) Total After Tax $ 6.5 $ 6.1 $ 18.8 $ 17.7 Total Reclassifications for the Period, Net of Tax $ 6.5 $ 51.9 $ 18.8 $ 63.5

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisition	Acquisition Avention, Inc. On January 9, 2017, we acquired a 100% equity interest in Avention. Avention is a Massachusetts-based company that provides organizations with a deeper understanding of company, contact and market data, delivered through a robust technology platform. As a result of the acquisition, the combined capability of our data and Avention’s technology positions Dun & Bradstreet as a leader in the sales acceleration market. The results of Avention have been included in our unaudited consolidated financial statements since the date of acquisition. The acquisition was accounted for in accordance with ASC 805 “Business Combinations.” The acquisition was valued at $150 million , net of cash acquired. Transaction costs of $4.1 million were included in Selling and Administrative Expenses in the unaudited consolidated statement of operations and comprehensive income (loss). The acquisition was accounted for as a purchase transaction, and accordingly, the assets and liabilities of the acquired entity were recorded at their estimated fair values at the date of the acquisition. The table below reflects the purchase price related to the acquisition and the resulting purchase allocation: Measurement Period Adjustments Amortization Life (years) Preliminary Purchase Price Allocation at March 31, 2017 Second Quarter of 2017 Third Quarter of 2017 Preliminary Purchase Price Allocation at September 30, 2017 Cash $ 4.2 $ — $ — $ 4.2 Accounts Receivable 13.6 — — 13.6 Other Current Assets 2.3 — — 2.3 Total Current Assets $ 20.1 $ — $ — $ 20.1 Intangible Assets: Customer Relationships 10 to 12 31.2 1.0 (1.3 ) 30.9 Technology 6 15.8 (0.7 ) (0.7 ) 14.4 Backlog 2 5.8 1.0 (0.3 ) 6.5 Goodwill Indefinite 112.8 0.8 0.5 114.1 Other 5.3 — — 5.3 Total Assets Acquired $ 191.0 $ 2.1 $ (1.8 ) $ 191.3 Deferred Revenue $ 23.3 $ (1.0 ) $ — $ 22.3 Deferred Tax Liability 7.7 3.1 (1.8 ) 9.0 Other Liabilities 5.8 — — 5.8 Total Liabilities Assumed $ 36.8 $ 2.1 $ (1.8 ) $ 37.1 Total Purchase Price 154.2 — — 154.2 Less: Cash Acquired (4.2 ) — — (4.2 ) Net Cash Consideration $ 150.0 $ — $ — $ 150.0 The fair value of the customer relationships and backlog intangible assets were determined by applying the income approach through a discounted cash flow analysis, specifically a multi-period excess earnings method. The valuation was based on the present value of the net earnings, or after-tax cash flows attributable to the measured assets. The technology intangible asset represents Avention’s data service platform to deliver customer services and solutions. The fair value of this intangible asset was determined by applying the income approach; specifically, a relief-from-royalty method. The fair value of the deferred revenue was determined based on estimated direct costs to fulfill the related obligations, plus a reasonable profit margin based on selected peer companies’ margins as a benchmark. The preliminary fair values of the acquired assets and liabilities are subject to change within the one -year measurement period. We expect to continue to obtain information to determine the fair values of the net assets acquired at the acquisition date during the measurement period. Since the initial valuation reflected in our financial results as of March 31, 2017, we have allocated goodwill and intangible assets between our Americas and Non-Americas segments based on their respective projected cash flows. In addition, we recorded adjustments to the deferred tax liability reflecting the allocation of intangible assets between segments. The above measurement period adjustments to the preliminary valuation of assets and liabilities resulted in a net increase of goodwill of $0.8 million in the second quarter of 2017 and $0.5 million in the third quarter of 2017. We expect to finalize the purchase accounting process in the fourth quarter of 2017 upon the completion of the analysis of certain tax attributes such as net operating loss and foreign tax credits. We believe that the information gathered to date provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. But, if facts and circumstances arise that necessitate change, we will adjust the associated fair values. Thus, the provisional measurements of fair value set forth above may be subject to further change. Goodwill of $81.3 million and $32.8 million was assigned to our Americas and Non-Americas segment, respectively, at September 30, 2017. The value of the goodwill is primarily related to Avention’s capability associated with product development which provides potential growth opportunities in the Sales Acceleration space. In addition, we expect cost synergies as a result of the acquisition. The intangible assets, with useful lives from 2 to 12 years, are being amortized over a weighted-average useful life of 8.6 years utilizing a straight-line method, which approximates the timing of the benefits derived. The intangibles have been recorded within Other Intangibles in our unaudited consolidated balance sheet since the date of acquisition. Tax Treatment of Goodwill The goodwill acquired is not deductible for tax purposes. Unaudited Pro Forma Financial Information The following unaudited pro forma statements of operations data presents the combined results of Dun & Bradstreet and Avention, assuming that the acquisition had occurred on January 1, 2016. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Reported GAAP Revenue (1) $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 Add: Avention Preacquisition Revenue — 14.7 — 44.3 Add: Deferred Revenue Fair Value Adjustment 1.7 (1.7 ) 6.7 (6.7 ) Pro Forma Revenue $ 430.0 $ 425.8 $ 1,222.2 $ 1,224.2 Reported GAAP Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders (2) $ 54.1 $ (29.4 ) $ 114.7 $ 19.4 Pro Forma Adjustments - Net of Income Tax: Preacquisition Net Income (Losses) — (1.9 ) — (6.0 ) Deferred Revenue Fair Value Adjustment 1.4 (1.4 ) 4.6 (4.6 ) Amortization for Intangible Assets — (1.3 ) — (4.1 ) Acquisition-Related Costs — — 2.8 (2.8 ) Pro Forma Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 55.5 $ (34.0 ) $ 122.1 $ 1.9 (1) Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively. (2) Reported GAAP Net Income Attributable to Dun & Bradstreet Common Shareholders includes a net loss from Avention since the acquisition date of $1.6 million and $6.6 million for the three month and nine month periods ended September 30, 2017, respectively.

Divestitures and Discontinued O

Divestitures and Discontinued Operations	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Divestitures and Discontinued Operations	Divestitures and Discontinued Operations Divestitures As part of our growth strategy, we decided to shift our businesses in Latin America and Benelux to a Worldwide Network partner model. On August 1, 2016, our Board approved the divestiture of our domestic operations in Latin America and Benelux. As a result, we entered into a definitive agreement with CB Alliance to sell our Latin America businesses, and a separate definitive agreement to sell our Benelux businesses to Banque Populaire Developpement. Subsequent to the signing of the definitive agreement, but prior to the closing, CB Alliance assigned its rights and obligations under the definitive agreement to its affiliates Amerigo Alliance AG (“Amerigo”) and Jade Green Investments, Inc. In addition, subsequent to the signing of the definitive agreement, but prior to the closing, Banque Populaire Developpement assigned its rights and obligations under the definitive agreement to its affiliate Altares B.V. Both transactions also include long-term commercial arrangements where we will receive future cash payments primarily for our global data, brand licensing and technology services. These commercial agreements also provide us access to the domestic data in the Benelux and Latin America territories. Both transactions were closed in the fourth quarter of 2016 with the completion of the Latin America divestiture on September 30, 2016 and the Benelux divestiture on November 7, 2016. Our subsidiaries outside the U.S. and Canada reflect a year-end of November 30. Latin America The sale was valued at $11 million , for which we received a five -year note with an interest rate of 2% per annum. We received a payment of $1.2 million during the third quarter of 2017, of which $1.0 million was related to the annual principal payment and $0.2 million was related to the accrued interest payment. We recorded a total pre-tax loss of $18.4 million in connection with the sale of the Latin America businesses for the year ended December 31, 2016, of which $17.5 million was reported in the third quarter of 2016 when the Latin America businesses were classified as assets held for sale and $0.9 million was reported in the fourth quarter of 2016, reflecting the final asset value on the disposal date. The loss was primarily attributable to the release of a cumulative foreign currency translation loss of $16.6 million . We also recognized a liability of $ 1.8 million related to our contingent liability to reimburse the purchasers for certain future severance payments and other employee benefit payments related to our former employees transferred to the buyer as part of the divestiture transaction. The liability was established based on our estimate of the probable outcome of the related contingent events. As of September 30, 2017, we have made payments of $0.7 million to the purchasers related to our former employees’ benefits which were included in “Cash Flows from Operating Activities” in our Consolidated Statements of Cash Flows for the nine months ended September 30, 2017. In addition, we have made payments of $0.3 million related to severance payments incurred by the purchasers, which were included in “Cash Flows from Investing Activities” in our Consolidated Statements of Cash Flows for the nine months ended September 30, 2017. Our businesses in Latin America were historically included in our Americas segment. Transaction costs associated with the divestiture were $4.4 million , of which $1.6 million , $2.7 million and $0.1 million were paid in the third quarter of 2016, the fourth quarter of 2016 and the first quarter of 2017, respectively. Payments for transaction costs were included as “Cash Flows from Investing Activities” in our Consolidated Statements of Cash Flows. The assets and liabilities in the Latin America businesses on the disposal date were as follows: At Disposal Date Cash and Cash Equivalents $ 1.7 Accounts Receivable 0.6 Other Current Assets 0.4 Goodwill 5.5 Other Long-Term Assets 2.0 Total Assets $ 10.2 Accrued and Other Current Liabilities $ 1.7 Deferred Revenue 1.6 Other Long-Term Liabilities 0.3 Total Liabilities $ 3.6 In connection with the divestiture, we also entered into a commercial service agreement with the initial term of eight years through 2024. The agreement is renewable subject to certain terms and conditions. Under the agreement, Amerigo will act as the exclusive distributor of our products and services in the Latin American territory, and we will act as the exclusive data distributor of Amerigo outside the Latin American territory. As part of this commercial service agreement, we also entered into a trademark license agreement and technology services agreement with the same term as the commercial service agreement. We expect to receive total payments of approximately $36 million under these agreements during the initial eight -year period. Benelux The sale was valued at $27 million , net of a working capital adjustment of $0.9 million . In November 2016, we received proceeds, net of divested cash, of $24 million and estimated a working capital adjustment of $0.2 million payable to the buyer. In the first quarter of 2017, we have finalized the working capital adjustment and made a payment of $0.9 million to the buyer. As a result, we recorded an additional pre-tax loss of $0.7 million for the sale of the Benelux businesses in the first quarter of 2017. For the year ended December 31, 2016, we recorded a total pre-tax loss of $76.7 million related to the divestiture of the Benelux businesses, of which $72.1 million was reported when the Benelux businesses were classified as assets held for sale in the third quarter of 2016 and $4.6 million was reported in the fourth quarter of 2016, reflecting the final net asset value on the disposal date. The loss was primarily attributable to the release of a cumulative foreign currency translation loss of $72.9 million . We also recognized a liability of $0.8 million related to our contingent liability to reimburse Altares B.V. for certain future severance payments to our former employees transferred to the buyer as part of the divestiture transaction. The liability was established based on our estimate of the probable outcome of the related contingent events. As of September 30, 2017, we have made payments of $0.7 million to the purchaser which were included as “Cash Flows from Investing Activities” in our Consolidated Statements of Cash Flows for the nine months ended September 30, 2017. Our businesses in Benelux were historically included in our Non-Americas segment. Transaction costs associated with the divestiture were $5.0 million , of which $1.5 million and $3.5 million were paid in the third quarter of 2016 and fourth quarter of 2016, respectively. Payments for transaction costs were included as “Cash Flows from Investing Activities” in our Consolidated Statements of Cash Flows. The assets and liabilities in the Benelux businesses on the disposal date were as follows: At Disposal Date Cash and Cash Equivalents $ 3.7 Accounts Receivable 12.4 Other Current Assets 0.8 Goodwill 31.4 Other Long-Term Assets 0.8 Total Assets $ 49.1 Accrued and Other Current Liabilities $ 5.3 Deferred Revenue 18.0 Other Long-Term Liabilities — Total Liabilities $ 23.3 In connection with the divestiture, we also entered into a commercial service agreement with the initial term of ten years through 2026. The agreement is renewable subject to certain terms and conditions. Under the agreement, Altares B.V., will act as the exclusive distributor of our products and services in the Benelux territory, and we will act as the exclusive data distributor of Altares B.V. outside the Benelux territory. As part of this commercial service agreement, we also entered into a trademark license agreement and technology services agreement co-terminous with the commercial service agreement. Subsequently, the commercial service agreement was extended for an additional five -year term in the third quarter of 2017. We expect to receive total payments of approximately $400 million under these agreements during the 15 -year period. Discontinued Operations As part of our growth strategy, we decided to shift our business in Australia and New Zealand (“ANZ”) to a Worldwide Network partner model. On June 12, 2015, we entered into an agreement with Archer Capital (“Archer”) to sell our business in ANZ. The transaction was completed on June 30, 2015, or the third quarter of 2015. In accordance with ASC 205-20, “Discontinued Operations,” if a disposal of a business represents a strategic shift that has a major effect on an entity’s operations and financial results, the disposal transaction should be reported in discontinued operations. Accordingly, we have reclassified the historical financial results of the ANZ business as discontinued operations. The sale was initially valued at $169.8 million , of which we received proceeds of $159.7 million , inclusive of a working capital adjustment of $0.7 million . The remaining proceeds of $10.1 million were being held in an escrow account until the resolution of certain contingent events as defined in the Share Sale Agreement. Under the agreement the escrow funds may be used to reimburse certain future costs incurred by Archer related to data supplier arrangements and specified technology and data operation infrastructure upgrades over the next three years since the disposal date. A reserve was established based on our estimate of the probable outcome of the contingent events discussed above. We recorded a pre-tax loss on the disposal of a business of $0.9 million during the third quarter of 2016, reflecting the increase of escrow reserve discussed above. At December 31, 2016, we did not expect to receive any payment from the escrow fund and had a reserve of $10.1 million . In March 2017, there was an amendment to the Share Sale Agreement eliminating the escrow requirements. In addition, during the first quarter of 2017 we recorded a loss on the disposal of business of $0.8 million , resulting from a settlement payment associated with Archer’s warranty claim. Our business in ANZ was historically recorded in our Non-Americas segment. In connection with the divestiture, we also entered into a commercial service agreement with the initial term of five years through 2020. The agreement is renewable subject to certain terms and conditions. Under the agreement, Archer will act as the exclusive distributor of our products and services in the ANZ territory, and we will act as Archer’s exclusive product distributor outside the ANZ territory. As part of this commercial service agreement, we also entered into a trademark license agreement with the same term as the commercial service agreement. Under the trademark agreement, Archer is granted an exclusive right to use our domain name and trademark in the ANZ territories with certain restrictions. We will receive total royalty payments of approximately $8 million during the initial five -year period.

Goodwill and Other Intangibles

Goodwill and Other Intangibles	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other Intangibles Computer Software and Goodwill: Computer Software Goodwill December 31, 2016 $ 108.1 $ 651.9 Acquisitions (1) 0.6 112.8 Additions at Cost (2) 12.7 — Amortization (7.7 ) — Other (3) (0.1 ) 0.3 March 31, 2017 113.6 765.0 Acquisitions (1) — 0.8 Additions at Cost (2) 14.5 — Amortization (7.8 ) — Other (3) 2.7 4.4 June 30, 2017 123.0 770.2 Acquisitions (1) — 0.5 Additions at Cost (2) 14.5 — Amortization (8.9 ) — Write-off (1.1 ) — Other (3) 2.0 3.9 September 30, 2017 $ 129.5 $ 774.6 (1) Computer Software and Goodwill - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q. (2) Computer Software - Primarily due to software-related enhancements on products and the purchase of third party licenses. (3) Computer Software and Goodwill - Primarily due to the impact of foreign currency fluctuations. Other Intangibles: Customer Relationships Other Definite-Lived Intangibles Other Indefinite-Lived Intangibles Total December 31, 2016 (4) $ 74.6 $ 63.1 $ 158.4 $ 296.1 Acquisitions (5) 31.2 21.6 — 52.8 Additions at Cost — — — — Amortization (3.7 ) (4.5 ) — (8.2 ) Other 0.1 — — 0.1 March 31, 2017 (4) 102.2 80.2 158.4 340.8 Acquisitions (5) 1.0 0.3 — 1.3 Additions at Cost — 0.2 — 0.2 Amortization (3.8 ) (4.6 ) — (8.4 ) Other 0.4 0.1 — 0.5 June 30, 2017 (4) 99.8 76.2 158.4 334.4 Acquisitions (5) (1.3 ) (1.0 ) — (2.3 ) Additions at Cost — 0.3 — 0.3 Amortization (3.7 ) (4.2 ) — (7.9 ) Other — — — — September 30, 2017 $ 94.8 $ 71.3 $ 158.4 $ 324.5 (4) Customer Relationships - Net of accumulated amortization of $36.7 million , $32.9 million , $28.8 million and $25.1 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. Other Definite-Lived Intangibles - Net of accumulated amortization of $99.0 million , $100.7 million , $95.4 million and $91.2 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. (5) Customer Relationships and Other Definite-Lived Intangibles - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.

Contractual Obligations

Contractual Obligations	9 Months Ended
	Sep. 30, 2017
Contractual Obligations [Abstract]
Contractual Obligations	Contractual Obligations Convergys Customer Management Group We currently have outsourcing agreements with Convergys Customer Management Group (“CCMG”) through December 2022 related to our customer contact center solution. The primary scope of the agreement includes the following services for our North America business: (i) Inbound Customer Service, which principally involves the receipt of, response to and resolution of inquiries received from customers; (ii) Outbound Customer Service, which principally involves the collection, compilation and verification of information contained in our databases; and (iii) Data Update Service, which principally involves the bulk or discrete updates to the critical data elements about companies in our databases. In March 2017, we notified CCMG of our decision to discontinue certain services under the outsourcing agreements primarily related to the Inbound Customer Service function effective September 2017, resulting in a reduction of service commitments of approximately $19 million . At March 31, 2017, total expected payments to CCMG over the remaining terms of the above contracts will aggregate to approximately $70 million . The agreements specify service level commitments required of CCMG for achievement of our customer satisfaction targets and our overall satisfaction. The agreements also specify a methodology for calculating credits to us if CCMG fails to meet certain service levels. As a result of the above amendment, we have updated our future contractual obligations as the following: Contractual Obligations 2017 2018 2019 2020 2021 Thereafter Total Obligations to Outsourcers $ 138.5 $ 76.7 $ 45.3 $ 36.3 $ 29.8 $ 12.4 $ 339.0

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration In October 2017 , the Board of Directors approved the declaration of a dividend of $0.5025 per share of common stock for the fourth quarter of 2017 . This cash dividend will be payable on December 8, 2017 to shareholders of record at the close of business on November 22, 2017 .

Restructuring Charge (Tables)

Restructuring Charge (Tables)	9 Months Ended
	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring Reserves and Utilization Related to Financial Flexibility Initiatives	The following tables set forth, in accordance with ASC 712-10 and/or ASC 420-10, the restructuring reserves and utilization: Severance and Termination Contract Termination, Lease Termination Obligations and Other Exit Costs Total Restructuring Charges: Balance Remaining as of December 31, 2016 $ 8.3 $ 1.7 $ 10.0 Charge Taken during the First Quarter 2017 7.7 1.3 9.0 Payments Made during the First Quarter 2017 (4.1 ) (0.4 ) (4.5 ) Balance Remaining as of March 31, 2017 $ 11.9 $ 2.6 $ 14.5 Charge Taken during the Second Quarter 2017 5.9 1.6 7.5 Payments Made during the Second Quarter 2017 (6.2 ) (1.8 ) (8.0 ) Balance Remaining as of June 30, 2017 $ 11.6 $ 2.4 $ 14.0 Charge Taken during the Third Quarter 2017 $ 3.6 $ 2.2 $ 5.8 Payments Made during the Third Quarter 2017 (5.7 ) (0.6 ) (6.3 ) Balance Remaining as of September 30, 2017 $ 9.5 $ 4.0 $ 13.5 Severance and Termination Contract Termination, Lease Termination Obligations and Other Exit Costs Total Restructuring Charges: Balance Remaining as of December 31, 2015 $ 18.6 $ 2.3 $ 20.9 Charge Taken during the First Quarter 2016 9.7 — 9.7 Payments Made during the First Quarter 2016 (10.1 ) (0.3 ) (10.4 ) Balance Remaining as of March 31, 2016 $ 18.2 $ 2.0 $ 20.2 Charge Taken during the Second Quarter 2016 5.9 — 5.9 Payments Made during the Second Quarter 2016 (10.0 ) (0.4 ) (10.4 ) Balance Remaining as of June 30, 2016 $ 14.1 $ 1.6 $ 15.7 Charge Taken during the Third Quarter 2016 $ 3.2 $ — $ 3.2 Payments Made during the Third Quarter 2016 (7.6 ) (0.1 ) (7.7 ) Balance Remaining as of September 30, 2016 $ 9.7 $ 1.5 $ 11.2

Notes Payable and Indebtedness

Notes Payable and Indebtedness (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Notes Payable And Indebtedness Additional Information [Abstract]
Borrowings	Our borrowings are summarized in the following table: September 30, 2017 At December 31, 2016 Maturity Principal Amount Debt Issuance Costs and Discount* Carrying Value Principal Amount Debt Issuance Costs and Discount* Carrying Value Short-Term Debt: Term Loan Facility $ 30.0 $ — $ 30.0 $ 22.5 $ — $ 22.5 Total Short-Term Debt $ 30.0 $ — $ 30.0 $ 22.5 $ — $ 22.5 Long-Term Debt: Five Year 3.50% senior notes (1) (2) December 1, 2017 $ 450.0 $ 0.1 $ 449.9 $ 450.0 $ 0.6 $ 449.4 Ten Year 4.625% senior notes (1) (2) December 1, 2022 300.0 2.8 297.2 300.0 3.2 296.8 Five Year 4.25% senior notes (1) (3) June 15, 2020 300.0 2.1 297.9 300.0 2.7 297.3 Term Loan Facility November 13, 2020 330.0 1.0 329.0 352.5 1.3 351.2 Revolving Credit Facility July 23, 2019 277.6 — 277.6 199.8 — 199.8 Commercial Paper Program July 23, 2019 — — — — — — Total Long-Term Debt $ 1,657.6 $ 6.0 $ 1,651.6 $ 1,602.3 $ 7.8 $ 1,594.5 *Represents unamortized portion of debt issuance costs and discounts. (1) The notes contain certain covenants that limit our ability to create liens, enter into sale and leaseback transactions and consolidate, merge or sell assets to another entity. We were in compliance with these non-financial covenants at September 30, 2017 and December 31, 2016 . The notes do not contain any financial covenants. (2) The interest rates are subject to an upward adjustment if our debt ratings decline three levels below the Standard & Poor ’ s ® and/or Fitch ® BBB+ credit ratings that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rates and the rates cannot adjust below the initial interest rates (see further discussion below). (3) The interest rate is subject to an upward adjustment if our debt ratings decline one level below the Standard & Poor’s BBB- credit rating and/or two levels below the Fitch BBB credit rating that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rate and the rate cannot adjust below the initial interest rate (see further discussion below).

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	The following table sets forth the computation of basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders – Basic and Diluted $ 54.1 $ (28.5 ) $ 115.5 $ 20.3 Loss from Discontinued Operations – Net of Income Taxes — (0.9 ) (0.8 ) (0.9 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders – Basic and Diluted $ 54.1 $ (29.4 ) $ 114.7 $ 19.4 Weighted Average Number of Shares Outstanding – Basic 37.0 36.6 36.9 36.4 Dilutive Effect of Our Stock Incentive Plans 0.2 — 0.2 0.3 Weighted Average Number of Shares Outstanding – Diluted 37.2 36.6 37.1 36.7 Basic Earnings (Loss) Per Share of Common Stock: Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders $ 1.46 $ (0.78 ) $ 3.13 $ 0.56 Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders — (0.02 ) (0.02 ) (0.03 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 1.46 $ (0.80 ) $ 3.11 $ 0.53 Diluted Earnings (Loss) Per Share of Common Stock: Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders $ 1.45 $ (0.78 ) $ 3.11 $ 0.55 Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders — (0.02 ) (0.02 ) (0.02 ) Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 1.45 $ (0.80 ) $ 3.09 $ 0.53

Other Accrued and Current Lia29

Other Accrued and Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Other Accrued And Current Liabilities [Abstract]
Schedule of Accrued Liabilities [Table Text Block]	Other Accrued and Current Liabilities September 30, December 31, 2016 Restructuring Accruals $ 13.5 $ 10.0 Professional Fees 33.3 39.3 Operating Expenses 46.8 40.2 Other Accrued Liabilities (1) 40.8 65.1 $ 134.4 $ 154.6 (1) The decrease in other accrued liabilities from December 31, 2016 to September 30, 2017 was primarily due to a payment in the first quarter of 2017 for a service-based award related to the acquisition of Dun and Bradstreet Credibility Corp (“DBCC”), a payment to resolve a legal matter (Jeffrey A. Thomas v. DBCC) during the second quarter of 2017 and a decrease in the accrual for the Securities and Exchange Commission (“SEC”) and the United States Department of Justice (“DOJ”) investigation of our China operations during the second quarter of 2017.

Pension and Postretirement Be30

Pension and Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Pension And Postretirement Benefits Additional Information [Abstract]
Components of Net Periodic (Income) Cost Associated with Pension Plans and Postretirement Benefit Obligations	The following table sets forth the components of the net periodic cost (income) associated with our pension plans and our postretirement benefit obligations: Pension Plans Postretirement Benefit Obligations For the Three Months Ended September 30, For the Nine Months Ended September 30, For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 2017 2016 2017 2016 Components of Net Periodic Cost (Income): Service Cost $ 0.7 $ 0.8 $ 2.1 $ 2.3 $ 0.1 $ 0.1 $ 0.5 $ 0.5 Interest Cost 14.9 15.1 43.4 44.9 0.1 0.1 0.3 0.3 Expected Return on Plan Assets (23.6 ) (23.9 ) (70.5 ) (72.5 ) — — — — Amortization of Prior Service Cost (Credit) 0.1 0.1 0.2 0.2 (0.2 ) (0.4 ) (0.8 ) (1.2 ) Recognized Actuarial Loss (Gain) 10.0 9.7 30.0 29.0 (0.5 ) (0.3 ) (1.1 ) (1.1 ) Net Periodic Cost (Income) $ 2.1 $ 1.8 $ 5.2 $ 3.9 $ (0.5 ) $ (0.5 ) $ (1.1 ) $ (1.5 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information, Revenue and Operating Income (Loss)	For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Revenue: Americas $ 352.0 $ 338.8 $ 1,000.1 $ 974.9 Non-Americas 76.3 74.0 215.4 211.7 Consolidated Total $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 Operating Income: Americas $ 99.7 $ 100.6 $ 233.5 $ 253.9 Non-Americas 23.4 20.0 62.8 47.2 Total Segments 123.1 120.6 296.3 301.1 Corporate and Other (1) (27.9 ) (23.8 ) (83.8 ) (104.6 ) Consolidated Total 95.2 96.8 212.5 196.5 Non-Operating Income (Expense) - Net (2) (15.7 ) (105.0 ) (44.6 ) (130.6 ) Income (Loss) Before Provision for Income Taxes and Equity in Net Income of Affiliates $ 79.5 $ (8.2 ) $ 167.9 $ 65.9 (1) The following table summarizes “Corporate and Other:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Corporate Costs $ (21.9 ) $ (20.0 ) $ (64.6 ) $ (57.5 ) Restructuring Expense (5.8 ) (3.2 ) (22.3 ) (18.8 ) Acquisition-Related Costs (a) (0.2 ) (0.2 ) (4.8 ) (0.8 ) Decrease/(Increase) of Accrual for Legal Matters (b) — — 8.0 (26.0 ) Legal and Other Professional Fees and Shut-Down (Costs) Recoveries Related to Matters in China — (0.4 ) (0.1 ) (1.5 ) Total Corporate and Other $ (27.9 ) $ (23.8 ) $ (83.8 ) $ (104.6 ) (a) The acquisition-related costs (e.g., banker's fees) for the three month and nine month periods ended September 30, 2017 were primarily related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q. (b) The decrease in the accrued expenses for legal matters for the nine months ended September 30, 2017 was related to the SEC and DOJ investigation of our China operations. The accrued expenses for legal matters for the nine months ended September 30, 2016 is related to litigation (Jeffrey A. Thomas v. DBCC), net of an indemnification from the DBCC acquisition escrows, and the SEC and DOJ investigation of our China operations. (2) The following table summarizes “Non-Operating Income (Expense) - Net:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Interest Income $ 0.4 $ 0.4 $ 1.2 $ 1.4 Interest Expense (15.2 ) (13.2 ) (44.9 ) (40.1 ) Other Income (Expense) - Net (a) (0.9 ) (92.2 ) (0.9 ) (91.9 ) Non-Operating Income (Expense) - Net $ (15.7 ) $ (105.0 ) $ (44.6 ) $ (130.6 ) (a) The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
Supplemental Geographic and Customer Solution Set Information	Supplemental Geographic and Customer Solution Set Information: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Customer Solution Set Revenue: Americas: Risk Management Solutions $ 202.6 $ 203.6 $ 567.9 $ 565.4 Sales & Marketing Solutions 149.4 135.2 432.2 409.5 Total Americas Revenue $ 352.0 $ 338.8 $ 1,000.1 $ 974.9 Non-Americas: Risk Management Solutions $ 60.2 $ 60.3 $ 171.9 $ 175.0 Sales & Marketing Solutions 16.1 13.7 43.5 36.7 Total Non-Americas Revenue $ 76.3 $ 74.0 $ 215.4 $ 211.7 Consolidated Total: Risk Management Solutions $ 262.8 $ 263.9 $ 739.8 $ 740.4 Sales & Marketing Solutions 165.5 148.9 475.7 446.2 Consolidated Total Revenue $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 At September 30, 2017 At December 31, 2016 Assets: Americas (3) $ 1,409.7 $ 1,432.6 Non-Americas (4) 698.4 555.9 Total Segments 2,108.1 1,988.5 Corporate and Other (5) 192.9 220.7 Consolidated Total $ 2,301.0 $ 2,209.2 Goodwill: Americas $ 633.5 $ 550.6 Non-Americas 141.1 101.3 Consolidated Total (6) $ 774.6 $ 651.9 (3) Total assets in the Americas segment at September 30, 2017 decreased by $22.9 million compared to December 31, 2016, primarily driven by a decrease in accounts receivable resulting from the cyclical sales pattern of our Americas business and a decrease in other intangible assets due to normal amortization, partially offset by an increase in total assets as the result of the acquisition of Avention in the first quarter of 2017 (see Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q), and an increase in computer software due to software-related enhancements on products. (4) Total assets in the Non-Americas segment at September 30, 2017 increased by $142.5 million compared to December 31, 2016, primarily driven by a net increase in cash as a result of the cyclical pattern of collections in the segment, an increase due to the acquisition of Avention in the first quarter of 2017, and the positive impact of foreign currency translation. (5) Total assets in Corporate and Other at September 30, 2017 decreased by $27.8 million compared to December 31, 2016, primarily driven by a net decrease in cash and a decrease in net deferred tax assets due to the acquisition of Avention. (6) Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Financial Instruments Additional Information [Abstract]
Fair Values of Derivative Instruments in Consolidated Balance Sheet	Fair Values of Derivative Instruments in the Consolidated Balance Sheet Asset Derivatives Liability Derivatives September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives not designated as hedging instruments Foreign exchange forward contracts Other Current Assets $ 1.3 Other Current Assets $ 1.5 Other Accrued & Current Liabilities $ 1.4 Other Accrued & Current Liabilities $ 1.4 Total derivatives not designated as hedging instruments $ 1.3 $ 1.5 $ 1.4 $ 1.4 Total Derivatives $ 1.3 $ 1.5 $ 1.4 $ 1.4
Effect of Derivative Instruments on Consolidated Statement of Operations	The Effect of Derivative Instruments on the Consolidated Statement of Operations and Comprehensive Income (Loss) Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income on Derivatives Amount of Gain or (Loss) Recognized in Income on Derivatives For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016 Foreign exchange forward contracts Non-Operating Income (Expenses) – Net $ 3.8 $ 0.9 $ 8.6 $ (5.9 )
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes fair value measurements by level at September 30, 2017 for assets and liabilities measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level I) Significant Other Observable Inputs (Level II) Significant Unobservable Inputs (Level III) Balance at September 30, 2017 Assets: Cash Equivalents (1) $ 208.2 $ — $ — $ 208.2 Other Current Assets: Foreign Exchange Forwards (2) $ — $ 1.3 $ — $ 1.3 Liabilities: Other Accrued and Current Liabilities: Foreign Exchange Forwards (2) $ — $ 1.4 $ — $ 1.4 (1) Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less. (2) Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation. There were no transfers between Levels I and II for the nine months ended September 30, 2017 . There were no transfers in or transfers out of Level III in the fair value hierarchy for the nine months ended September 30, 2017 . The following table summarizes fair value measurements by level at December 31, 2016 for assets and liabilities measured at fair value on a recurring basis: Quoted Prices in Active Markets for Identical Assets (Level I) Significant Other Observable Inputs (Level II) Significant Unobservable Inputs (Level III) Balance at December 31, 2016 Assets: Cash Equivalents (1) $ 238.3 $ — $ — $ 238.3 Other Current Assets: Foreign Exchange Forwards (2) $ — $ 1.5 $ — $ 1.5 Liabilities: Other Accrued and Current Liabilities: Foreign Exchange Forwards (2) $ — $ 1.4 $ — $ 1.4 Contingent Consideration (3) $ — $ — $ — $ — Other Non-Current Liabilities: Contingent Consideration (3) $ — $ — $ — $ — (1) Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less. (2) Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation. (3) Relates to our contingent consideration liability associated with the acquisition of DBCC in the second quarter of 2015. In October 2016, there was an amendment to the Earnout Agreement, replacing it with a service-based award. As a result, in the fourth quarter of 2016, we reversed the balance of the contingent consideration liability of $9.1 million and accrued $14.0 million related to the service-based award associated with 2016. Both adjustments were reflected in “Operating Costs” in our Americas segment in the fourth quarter of 2016. See Note 18 to the consolidated financial statements included in our Annual Report on Form 10-K for further detail.
Carrying Amount and Estimated Fair Value of Asset (Liability)	The estimated fair values of other financial instruments subject to fair value disclosures, determined based on valuation models using discounted cash flow methodologies with market data inputs from globally recognized data providers and third-party quotes from major financial institutions (categorized as Level II in the fair value hierarchy), are as follows: Balance at September 30, 2017 December 31, 2016 Carrying Amount (Asset) Liability Fair Value (Asset) Liability Carrying Amount (Asset) Liability Fair Value (Asset) Liability Short-term and Long-term Debt $ 1,045.0 $ 1,076.6 $ 1,043.5 $ 1,063.1 Revolving Credit Facility $ 277.6 $ 276.8 $ 199.8 $ 200.2 Term Loan Facility $ 359.0 $ 363.3 $ 373.7 $ 383.6

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassifications out of AOCI [Table Text Block]	The following table summarizes the reclassifications out of AOCI as of September 30, 2017 and 2016 : Details About Accumulated Other Comprehensive Income Components Affected Line Item in the Statement Where Net Income is Presented Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Foreign Currency Translation Adjustments: Sale of Business Other Income (Expense) – Net $ — $ 45.8 $ — $ 45.8 Defined Benefit Pension Plans: Amortization of Prior Service Costs Selling and Administrative Expenses $ (0.1 ) $ (0.3 ) $ (0.4 ) $ (0.7 ) Operating Expenses — (0.1 ) (0.2 ) (0.3 ) Amortization of Actuarial Gain/Loss Selling and Administrative Expenses 6.2 6.4 18.8 18.8 Operating Expenses 3.4 3.1 10.2 9.1 Total Before Tax 9.5 9.1 28.4 26.9 Tax (Expense) or Benefit (3.0 ) (3.0 ) (9.6 ) (9.2 ) Total After Tax $ 6.5 $ 6.1 $ 18.8 $ 17.7 Total Reclassifications for the Period, Net of Tax $ 6.5 $ 51.9 $ 18.8 $ 63.5
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the changes in the accumulated balances for each component of accumulated other comprehensive income (“AOCI”) as of September 30, 2017 and 2016 : Foreign Currency Translation Adjustments Defined Benefit Pension Plans Total Balance, December 31, 2015 $ (291.7 ) $ (673.8 ) $ (965.5 ) Other Comprehensive Income Before Reclassifications (41.1 ) (3.9 ) (45.0 ) Amounts Reclassified From Accumulated Other Comprehensive Income, net of tax 45.8 17.7 63.5 Balance, September 30, 2016 $ (287.0 ) $ (660.0 ) $ (947.0 ) Balance, December 31, 2016 $ (266.2 ) $ (683.4 ) $ (949.6 ) Other Comprehensive Income Before Reclassifications 35.7 (3.9 ) 31.8 Amounts Reclassified From Accumulated Other Comprehensive Income, net of tax — 18.8 18.8 Balance, September 30, 2017 $ (230.5 ) $ (668.5 ) $ (899.0 )

Acquisition Acquisition (Tables

Acquisition Acquisition (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]	The following unaudited pro forma statements of operations data presents the combined results of Dun & Bradstreet and Avention, assuming that the acquisition had occurred on January 1, 2016. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Reported GAAP Revenue (1) $ 428.3 $ 412.8 $ 1,215.5 $ 1,186.6 Add: Avention Preacquisition Revenue — 14.7 — 44.3 Add: Deferred Revenue Fair Value Adjustment 1.7 (1.7 ) 6.7 (6.7 ) Pro Forma Revenue $ 430.0 $ 425.8 $ 1,222.2 $ 1,224.2 Reported GAAP Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders (2) $ 54.1 $ (29.4 ) $ 114.7 $ 19.4 Pro Forma Adjustments - Net of Income Tax: Preacquisition Net Income (Losses) — (1.9 ) — (6.0 ) Deferred Revenue Fair Value Adjustment 1.4 (1.4 ) 4.6 (4.6 ) Amortization for Intangible Assets — (1.3 ) — (4.1 ) Acquisition-Related Costs — — 2.8 (2.8 ) Pro Forma Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders $ 55.5 $ (34.0 ) $ 122.1 $ 1.9 (1) Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively. (2) Reported GAAP Net Income Attributable to Dun & Bradstreet Common Shareholders includes a net loss from Avention since the acquisition date of $1.6 million and $6.6 million for the three month and nine month periods ended September 30, 2017, respectively.
Purchase Price Allocation [Table Text Block]	The table below reflects the purchase price related to the acquisition and the resulting purchase allocation: Measurement Period Adjustments Amortization Life (years) Preliminary Purchase Price Allocation at March 31, 2017 Second Quarter of 2017 Third Quarter of 2017 Preliminary Purchase Price Allocation at September 30, 2017 Cash $ 4.2 $ — $ — $ 4.2 Accounts Receivable 13.6 — — 13.6 Other Current Assets 2.3 — — 2.3 Total Current Assets $ 20.1 $ — $ — $ 20.1 Intangible Assets: Customer Relationships 10 to 12 31.2 1.0 (1.3 ) 30.9 Technology 6 15.8 (0.7 ) (0.7 ) 14.4 Backlog 2 5.8 1.0 (0.3 ) 6.5 Goodwill Indefinite 112.8 0.8 0.5 114.1 Other 5.3 — — 5.3 Total Assets Acquired $ 191.0 $ 2.1 $ (1.8 ) $ 191.3 Deferred Revenue $ 23.3 $ (1.0 ) $ — $ 22.3 Deferred Tax Liability 7.7 3.1 (1.8 ) 9.0 Other Liabilities 5.8 — — 5.8 Total Liabilities Assumed $ 36.8 $ 2.1 $ (1.8 ) $ 37.1 Total Purchase Price 154.2 — — 154.2 Less: Cash Acquired (4.2 ) — — (4.2 ) Net Cash Consideration $ 150.0 $ — $ — $ 150.0

Divestitures and Discontinued35

Divestitures and Discontinued Operations Divestiures and Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Divestiture, Disposed of by Sale, Benelux [Table Text Block]	The assets and liabilities in the Benelux businesses on the disposal date were as follows: At Disposal Date Cash and Cash Equivalents $ 3.7 Accounts Receivable 12.4 Other Current Assets 0.8 Goodwill 31.4 Other Long-Term Assets 0.8 Total Assets $ 49.1 Accrued and Other Current Liabilities $ 5.3 Deferred Revenue 18.0 Other Long-Term Liabilities — Total Liabilities $ 23.3
Divestiture, Disposed of by Sale, Latin America [Table Text Block]	The assets and liabilities in the Latin America businesses on the disposal date were as follows: At Disposal Date Cash and Cash Equivalents $ 1.7 Accounts Receivable 0.6 Other Current Assets 0.4 Goodwill 5.5 Other Long-Term Assets 2.0 Total Assets $ 10.2 Accrued and Other Current Liabilities $ 1.7 Deferred Revenue 1.6 Other Long-Term Liabilities 0.3 Total Liabilities $ 3.6

Goodwill and Other Intangibles

Goodwill and Other Intangibles Goodwill and other Intangibles (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	Computer Software and Goodwill: Computer Software Goodwill December 31, 2016 $ 108.1 $ 651.9 Acquisitions (1) 0.6 112.8 Additions at Cost (2) 12.7 — Amortization (7.7 ) — Other (3) (0.1 ) 0.3 March 31, 2017 113.6 765.0 Acquisitions (1) — 0.8 Additions at Cost (2) 14.5 — Amortization (7.8 ) — Other (3) 2.7 4.4 June 30, 2017 123.0 770.2 Acquisitions (1) — 0.5 Additions at Cost (2) 14.5 — Amortization (8.9 ) — Write-off (1.1 ) — Other (3) 2.0 3.9 September 30, 2017 $ 129.5 $ 774.6 (1) Computer Software and Goodwill - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q. (2) Computer Software - Primarily due to software-related enhancements on products and the purchase of third party licenses. (3) Computer Software and Goodwill - Primarily due to the impact of foreign currency fluctuations.
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Other Intangibles: Customer Relationships Other Definite-Lived Intangibles Other Indefinite-Lived Intangibles Total December 31, 2016 (4) $ 74.6 $ 63.1 $ 158.4 $ 296.1 Acquisitions (5) 31.2 21.6 — 52.8 Additions at Cost — — — — Amortization (3.7 ) (4.5 ) — (8.2 ) Other 0.1 — — 0.1 March 31, 2017 (4) 102.2 80.2 158.4 340.8 Acquisitions (5) 1.0 0.3 — 1.3 Additions at Cost — 0.2 — 0.2 Amortization (3.8 ) (4.6 ) — (8.4 ) Other 0.4 0.1 — 0.5 June 30, 2017 (4) 99.8 76.2 158.4 334.4 Acquisitions (5) (1.3 ) (1.0 ) — (2.3 ) Additions at Cost — 0.3 — 0.3 Amortization (3.7 ) (4.2 ) — (7.9 ) Other — — — — September 30, 2017 $ 94.8 $ 71.3 $ 158.4 $ 324.5 (4) Customer Relationships - Net of accumulated amortization of $36.7 million , $32.9 million , $28.8 million and $25.1 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. Other Definite-Lived Intangibles - Net of accumulated amortization of $99.0 million , $100.7 million , $95.4 million and $91.2 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. (5) Customer Relationships and Other Definite-Lived Intangibles - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.

Contractual Obligations Contrac

Contractual Obligations Contractual Obligations (Tables)	9 Months Ended
	Sep. 30, 2017
Contractual Obligations [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	As a result of the above amendment, we have updated our future contractual obligations as the following: Contractual Obligations 2017 2018 2019 2020 2021 Thereafter Total Obligations to Outsourcers $ 138.5 $ 76.7 $ 45.3 $ 36.3 $ 29.8 $ 12.4 $ 339.0

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017segment
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Operating Segments	2

Restructuring Charge - Addition

Restructuring Charge - Additional Information (Detail) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2017USD ($)person	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Sep. 30, 2016USD ($)person	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Sep. 30, 2017USD ($)person	Sep. 30, 2016USD ($)person
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 5.8	$ 7.5	$ 9	$ 3.2	$ 5.9	$ 9.7	$ 22.3	$ 18.8
Number of employees exited | person				60			285	315
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 3.6			$ 3.2			$ 15.6	$ 18.8
Number of employees impacted | person	50			70			320	325
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charge							$ 1.6
Lease Termination Obligations and Other Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 2.2	$ 1.6	$ 1.3	$ 0	$ 0	$ 0	$ 5.1

Restructuring Reserves and Util

Restructuring Reserves and Utilization Related to Financial Flexibility Initiatives (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Rollforward]
Beginning Balance	$ 14	$ 14.5	$ 10	$ 15.7	$ 20.2	$ 20.9	$ 10	$ 20.9
Charge Taken during the period	5.8	7.5	9	3.2	5.9	9.7	22.3	18.8
Payments for Restructuring	(6.3)	(8)	(4.5)	(7.7)	(10.4)	(10.4)	(18.6)	(28.4)
Ending Balance	13.5	14	14.5	11.2	15.7	20.2	13.5	11.2
Severance and Termination
Restructuring Reserve [Rollforward]
Beginning Balance	11.6	11.9	8.3	14.1	18.2	18.6	8.3	18.6
Charge Taken during the period	3.6	5.9	7.7	3.2	5.9	9.7
Payments for Restructuring	(5.7)	(6.2)	(4.1)	(7.6)	(10)	(10.1)
Ending Balance	9.5	11.6	11.9	9.7	14.1	18.2	9.5	9.7
Lease Termination Obligations and Other Exit Costs
Restructuring Reserve [Rollforward]
Beginning Balance	2.4	2.6	1.7	1.6	2	2.3	1.7	2.3
Charge Taken during the period	2.2	1.6	1.3	0	0	0	5.1
Payments for Restructuring	(0.6)	(1.8)	(0.4)	(0.1)	(0.4)	(0.3)
Ending Balance	$ 4	$ 2.4	$ 2.6	$ 1.5	$ 1.6	$ 2	$ 4	$ 1.5

Notes Payable and Indebtednes41

Notes Payable and Indebtedness - Additional Information (Detail) $ in Millions

May 14, 2015USD ($)segment

Dec. 01, 2012

Jun. 30, 2017USD ($)

Mar. 31, 2017USD ($)

Sep. 30, 2017USD ($)debt_rating_level

Sep. 30, 2016USD ($)

Mar. 27, 2017

Dec. 31, 2016USD ($)

Nov. 30, 2015USD ($)

Jul. 23, 2014USD ($)

Nov. 29, 2010

Debt Instrument [Line Items]

The period in which a financing agreement must extend beyond, for a short term obligation to be classified as non-current

1 year

Initial Draw Down under the Term Loan Facility

$ 400

Maximum number of drawdowns for borrowings related to delayed draw unsecured term loan facility | segment

2

Unsecured Term Loan Facility, Maximum Borrowing Capacity

$ 400

Finite-Lived Intangible Asset, Useful Life

5 years

Unsecured Term Loan Facility, the period within which repayments are expected to be made which are classified as short term debt

1 year

Contingent liability under open standby letters of credit in favor of third parties

$ 2.9

$ 2.6

Interest paid for all outstanding debt

(32.6)

$ (29.5)

Senior Notes Due 2017 [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

[1],[2]

$ 450

450

Long-Term Fixed-Rate Notes, annual interest rate

3.50%

Long-Term Fixed-Rate Notes

[1],[2]

$ 449.9

449.4

Debt Instrument, Term

5 years

Senior Notes Due 2022 [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

[1],[2]

$ 300

300

Long-Term Fixed-Rate Notes, annual interest rate

4.625%

Long-Term Fixed-Rate Notes

[1],[2]

$ 297.2

296.8

Senior Notes Due June 2020 [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

[2],[3]

$ 300

300

Long-Term Fixed-Rate Notes, annual interest rate

4.25%

Debt Instrument, Debt Rating Decrease Threshold below the Standard & Poor's BBB- Credit rating | debt_rating_level

1

Debt Instrument, Debt Rating Decrease Threshold | debt_rating_level

2

Long-Term Fixed-Rate Notes

[2],[3]

$ 297.9

$ 297.3

Maximum adjustments above initial interest rate

2.00%

Senior Notes Due 2017, 2020, and 2022 [Member]

Debt Instrument [Line Items]

Number of basis points that interest rates on senior notes were adjusted above their initial stated coupons, as a result of a downgrade to the corporate credit rating

25

Incremental Interest Cost

$ 0.7

$ 0.8

Senior Notes Due November 2015

Debt Instrument [Line Items]

Long-Term Fixed-Rate Notes, annual interest rate

2.875%

Senior Notes Due 2017 and 2022 [Member]

Debt Instrument [Line Items]

Debt Instrument, Debt Rating Decrease Threshold | debt_rating_level

3

Maximum adjustments above initial interest rate

2.00%

Term Loan [Member]

Debt Instrument [Line Items]

Number of basis points of the spread

137.5

Number of basis points of the spread after downgrade to corporate credit rating

150

Debt, Weighted Average Interest Rate

2.73%

2.03%

Commercial Paper [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

$ 0

$ 0

Credit facility, maximum borrowing capacity

$ 800

Debt Instrument, Number of Days From Issuance

364 days

Revolving Credit Facility October 2016

Debt Instrument [Line Items]

Debt Instrument, Face Amount

$ 277.6

199.8

Credit facility, maximum borrowing capacity

$ 1,000

$ 1,000

$ 1,000

Number of basis points of the spread

110

Number of basis points of the spread after downgrade to corporate credit rating

120

Debt, Weighted Average Interest Rate

2.45%

2.07%

Short-term Debt [Member] | Term Loan [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

$ 30

$ 22.5

Long-term Debt [Member] | Term Loan [Member]

Debt Instrument [Line Items]

Debt Instrument, Face Amount

$ 330

$ 352.5

[1]

The interest rates are subject to an upward adjustment if our debt ratings decline three levels below the Standard & Poor’s® and/or Fitch® BBB+ credit ratings that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rates and the rates cannot adjust below the initial interest rates (see further discussion below).

[2]

The notes contain certain covenants that limit our ability to create liens, enter into sale and leaseback transactions and consolidate, merge or sell assets to another entity. We were in compliance with these non-financial covenants at September 30, 2017 and December 31, 2016. The notes do not contain any financial covenants

[3]

The interest rate is subject to an upward adjustment if our debt ratings decline one level below the Standard & Poor’s BBB- credit rating and/or two levels below the Fitch BBB credit rating that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rate and the rate cannot adjust below the initial interest rate (see further discussion below).

Borrowings (Detail)

Borrowings (Detail) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Debt Maturing Within One Year:
Total Debt Maturing Within One year		$ 30	$ 22.5
Short-Term Debt		30	22.5
Debt Maturing After One Year:
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		6	7.8
Long-term Commercial Paper, Noncurrent		0	0
Total Debt Maturing After One Year		1,657.6	1,602.3
Long-Term Debt		1,651.6	1,594.5
Senior Notes Due 2017 [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount	[1],[2]	450	450
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[1],[2]	0.1	0.6
Long-Term Fixed-Rate Notes	[1],[2]	449.9	449.4
Senior Notes Due 2022 [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount	[1],[2]	300	300
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[1],[2]	2.8	3.2
Long-Term Fixed-Rate Notes	[1],[2]	297.2	296.8
Senior Notes Due June 2020 [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount	[2],[3]	300	300
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[2],[3]	2.1	2.7
Long-Term Fixed-Rate Notes	[2],[3]	297.9	297.3
Term Loan [Member]
Debt Maturing Within One Year:
Loans Payable, Current		30	22.5
Debt Maturing After One Year:
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		1	1.3
Loans Payable, Noncurrent		329	351.2
Short-term Debt [Member] | Term Loan [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount		30	22.5
Long-term Debt [Member] | Term Loan [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount		330	352.5
Revolving Credit Facility [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount		277.6	199.8
Credit Facility		277.6	199.8
Commercial Paper [Member]
Debt Maturing After One Year:
Debt Instrument, Face Amount		$ 0	$ 0
[1]	The interest rates are subject to an upward adjustment if our debt ratings decline three levels below the Standard & Poor’s® and/or Fitch® BBB+ credit ratings that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rates and the rates cannot adjust below the initial interest rates (see further discussion below).
[2]	The notes contain certain covenants that limit our ability to create liens, enter into sale and leaseback transactions and consolidate, merge or sell assets to another entity. We were in compliance with these non-financial covenants at September 30, 2017 and December 31, 2016. The notes do not contain any financial covenants
[3]	The interest rate is subject to an upward adjustment if our debt ratings decline one level below the Standard & Poor’s BBB- credit rating and/or two levels below the Fitch BBB credit rating that we held on the date of issuance. After a rate adjustment, if our debt ratings are subsequently upgraded, the adjustment(s) would reverse. The maximum adjustment is 2.00% above the initial interest rate and the rate cannot adjust below the initial interest rate (see further discussion below).

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock-based awards to acquire shares of common stock outstanding but not included in computation of diluted earnings per share (in shares)	8,899	330,813	13,887	14,793
Repurchase Program To Mitigate Dilutive Effect [Member] | Share Repurchase Program Twenty Fourteen [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock Repurchase Program, Authorized Amount					$ 100

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Disclosure [Line Items]
Income from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders- Basic and Diluted		$ 54.1		$ (28.5)		$ 115.5	$ 20.3
Loss from Discontinued Operations – Net of Income Taxes		0	[1]	(0.9)	[1]	(0.8)	(0.9)
Net Income Attributable to Dun & Bradstreet Common Shareholders - Basic and Diluted	[2]	$ 54.1		$ (29.4)		$ 114.7	$ 19.4
Weighted Average Number of Shares Outstanding – Basic		37		36.6		36.9	36.4
Dilutive Effect of Our Stock Incentive Plans		0.2		0		0.2	0.3
Weighted Average Number of Shares Outstanding – Diluted		37.2		36.6		37.1	36.7
Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders		$ 1.46		$ (0.78)		$ 3.13	$ 0.56
Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders		0		(0.02)		(0.02)	(0.03)
Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders		1.46		(0.80)		3.11	0.53
Income (Loss) from Continuing Operations Attributable to Dun & Bradstreet Common Shareholders		1.45		(0.78)		3.11	0.55
Loss from Discontinued Operations Attributable to Dun & Bradstreet Common Shareholders		0		(0.02)		(0.02)	(0.02)
Net Income (Loss) Attributable to Dun & Bradstreet Common Shareholders		$ 1.45		$ (0.80)		$ 3.09	$ 0.53
[1]	Tax Benefit (Expense) of $0.1 million and $0.2 million during the three months ended September 30, 2017 and 2016, respectively. Tax Benefit (Expense) of $0.3 million and $0.4 million during the nine months ended September 30, 2017 and 2016, respectively.
[2]	Reported GAAP Net Income Attributable to Dun & Bradstreet Common Shareholders includes a net loss from Avention since the acquisition date of $1.6 million and $6.6 million for the three month and nine month periods ended September 30, 2017, respectively.

Other Accrued and Current Lia45

Other Accrued and Current Liabilities (Detail) - USD ($) $ in Millions		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Accrued Liabilities [Line Items]
Restructuring Accruals		$ 13.5	$ 14	$ 14.5	$ 10	$ 11.2	$ 15.7	$ 20.2	$ 20.9
Professional Fees		33.3			39.3
Operating Expenses		46.8			40.2
Other Accrued Liabilities (1)	[1]	40.8			65.1
Accounts Payable and Other Accrued Liabilities		$ 134.4			$ 154.6
[1]	The decrease in other accrued liabilities from December 31, 2016 to September 30, 2017 was primarily due to a payment in the first quarter of 2017 for a service-based award related to the acquisition of Dun and Bradstreet Credibility Corp (“DBCC”), a payment to resolve a legal matter (Jeffrey A. Thomas v. DBCC) during the second quarter of 2017 and a decrease in the accrual for the Securities and Exchange Commission (“SEC”) and the United States Department of Justice (“DOJ”) investigation of our China operations during the second quarter of 2017.

Contingencies- Additional Infor

Contingencies- Additional Information (Detail)	Apr. 28, 2015USD ($)	Dec. 28, 2012person	Sep. 28, 2012person	Sep. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Mar. 17, 2015
Commitments and Contingencies Disclosure [Line Items]
Estimated Litigation Liability				$ 12,000,000
Loss Contingency, Pending Claims, Number						5
Pending Litigation [Member] | Shanghai Roadway D&B Marketing Services Co Ltd.
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Number of Defendants | person			5
Fines and Imprisonment [Member] | Shanghai Roadway D&B Marketing Services Co Ltd.
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Number of Defendants | person		4
D&B Credibility Corporation [Member] [Member]
Commitments and Contingencies Disclosure [Line Items]
Indemnification					$ 2,000,000
Maximum [Member]
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Damages Sought, Value	$ 1,500
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, Damages Sought, Value	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Effective tax rate	30.50%	(243.20%)	30.50%	68.40%
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ (79.5)	$ 8.2	$ (167.9)	$ (65.9)
Gross unrecognized tax benefits	7.3		7.3
Unrecognized tax benefits that, if recognized, would impact effective tax rate	6.8		6.8
Interest expense related to unrecognized tax benefits	0.1	0.1	0.2	0.3
Accrued interest expense related to unrecognized tax benefits	$ 0.4	$ 0.2	$ 0.4	$ 0.2

Components of Net Periodic (Inc

Components of Net Periodic (Income) Cost Associated with Pension Plans and Postretirement Benefit Obligations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Plans
Components of Net Periodic Cost (Income):
Service cost	$ 0.7	$ 0.8	$ 2.1	$ 2.3
Interest cost	14.9	15.1	43.4	44.9
Expected return on plan assets	(23.6)	(23.9)	(70.5)	(72.5)
Amortization of prior service cost (credit)	0.1	0.1	0.2	0.2
Recognized actuarial loss (gain)	10	9.7	30	29
Net Periodic Cost (Income)	2.1	1.8	5.2	3.9
Postretirement Benefit Obligations
Components of Net Periodic Cost (Income):
Service cost	0.1	0.1	0.5	0.5
Interest cost	0.1	0.1	0.3	0.3
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(0.2)	(0.4)	(0.8)	(1.2)
Recognized actuarial loss (gain)	(0.5)	(0.3)	(1.1)	(1.1)
Net Periodic Cost (Income)	$ (0.5)	$ (0.5)	$ (1.1)	$ (1.5)

Pension and Postretirement Be49

Pension and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
US Non-Qualified and Non-US Pension Plans [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 29
Employer contribution to employee benefit plans	$ 23.7
Postretirement Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 2
Employer contribution to employee benefit plans	$ 1

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Millions		9 Months Ended
		Sep. 30, 2017USD ($)segment		Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Disclosure [Line Items]
Assets		$ 2,301				$ 2,209.2
Number of Operating Segments | segment		2
Goodwill		$ 774.6	[1]	$ 770.2	$ 765	651.9	[1]
Maximum
Segment Reporting Disclosure [Line Items]
Percentage of total revenue from single customer		10.00%
Americas [Member]
Segment Reporting Disclosure [Line Items]
Assets	[2]	$ 1,409.7				1,432.6
Goodwill		633.5				550.6
Non-Americas [Member]
Segment Reporting Disclosure [Line Items]
Assets	[3]	698.4				555.9
Goodwill		$ 141.1				$ 101.3
[1]	Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.
[2]	Total assets in the Americas segment at September 30, 2017 decreased by $22.9 million compared to December 31, 2016, primarily driven by a decrease in accounts receivable resulting from the cyclical sales pattern of our Americas business and a decrease in other intangible assets due to normal amortization, partially offset by an increase in total assets as the result of the acquisition of Avention in the first quarter of 2017 (see Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q), and an increase in computer software due to software-related enhancements on products.
[3]	Total assets in the Non-Americas segment at September 30, 2017 increased by $142.5 million compared to December 31, 2016, primarily driven by a net increase in cash as a result of the cyclical pattern of collections in the segment, an increase due to the acquisition of Avention in the first quarter of 2017, and the positive impact of foreign currency translation.

Segment Information (Detail)

Segment Information (Detail) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Disclosure [Line Items]
Revenue	[1]	$ 428.3			$ 412.8			$ 1,215.5	$ 1,186.6
Operating Income		95.2			96.8			212.5	196.5
Non-Operating Income (Expense) - Net (2)	[2]	(15.7)			(105)			(44.6)	(130.6)
Income (Loss) Before Provision for Income Taxes and Equity in Net Income of Affiliates		79.5			(8.2)			167.9	65.9
Corporate Costs		142.6			130.7			424.3	396.1
Restructuring Charge		5.8	$ 7.5	$ 9	3.2	$ 5.9	$ 9.7	22.3	18.8
Interest Income		0.4			0.4			1.2	1.4
Interest Expense		(15.2)			(13.2)			(44.9)	(40.1)
Other Income (Expense) - Net (a)	[3]	(0.9)			(92.2)			(0.9)	(91.9)
Corporate, Non-Segment [Member]
Segment Reporting Disclosure [Line Items]
Operating Income	[4]	(27.9)			(23.8)			(83.8)	(104.6)
Corporate Costs		21.9			20			64.6	57.5
Restructuring Charge		5.8			3.2			22.3	18.8
Acquisition-Related Costs (a)	[5]	0.2			0.2			4.8	0.8
Decrease/(Increase) of Accrual for Legal Matters (b)	[6]	0			0			(8)	26
Legal and Other Professional Fees and Shut-Down (Costs) Recoveries Related to Matters in China		0			0.4			0.1	1.5
Total Segments
Segment Reporting Disclosure [Line Items]
Operating Income		123.1			120.6			296.3	301.1
Americas [Member]
Segment Reporting Disclosure [Line Items]
Revenue		352			338.8			1,000.1	974.9
Operating Income		99.7			100.6			233.5	253.9
Non-Americas [Member]
Segment Reporting Disclosure [Line Items]
Revenue		76.3			74			215.4	211.7
Operating Income		$ 23.4			$ 20			$ 62.8	$ 47.2
[1]	Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively.
[2]	The following table summarizes “Non-Operating Income (Expense) - Net:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016Interest Income$0.4 $0.4 $1.2 $1.4Interest Expense(15.2) (13.2) (44.9) (40.1)Other Income (Expense) - Net (a)(0.9) (92.2) (0.9) (91.9)Non-Operating Income (Expense) - Net$(15.7) $(105.0) $(44.6) $(130.6) (a) The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[3]	The decrease in Other Expense - Net for the three month and nine month periods ended September 30, 2017 as compared to the three month and nine month periods ended September 30, 2016, was primarily due to a loss on the divestiture of our operations in Benelux and Latin America in 2016. See Note 14 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[4]	The following table summarizes “Corporate and Other:” For the Three Months Ended September 30, For the Nine Months Ended September 30, 2017 2016 2017 2016Corporate Costs$(21.9) $(20.0) $(64.6) $(57.5)Restructuring Expense(5.8) (3.2) (22.3) (18.8)Acquisition-Related Costs (a)(0.2) (0.2) (4.8) (0.8)Decrease/(Increase) of Accrual for Legal Matters (b)— — 8.0 (26.0)Legal and Other Professional Fees and Shut-Down (Costs) Recoveries Related to Matters in China— (0.4) (0.1) (1.5)Total Corporate and Other$(27.9) $(23.8) $(83.8) $(104.6)(a) The acquisition-related costs (e.g., banker's fees) for the three month and nine month periods ended September 30, 2017 were primarily related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.(b)The decrease in the accrued expenses for legal matters for the nine months ended September 30, 2017 was related to the SEC and DOJ investigation of our China operations. The accrued expenses for legal matters for the nine months ended September 30, 2016 is related to litigation (Jeffrey A. Thomas v. DBCC), net of an indemnification from the DBCC acquisition escrows, and the SEC and DOJ investigation of our China operations.
[5]	The acquisition-related costs (e.g., banker's fees) for the three month and nine month periods ended September 30, 2017 were primarily related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[6]	The decrease in the accrued expenses for legal matters for the nine months ended September 30, 2017 was related to the SEC and DOJ investigation of our China operations. The accrued expenses for legal matters for the nine months ended September 30, 2016 is related to litigation (Jeffrey A. Thomas v. DBCC), net of an indemnification from the DBCC acquisition escrows, and the SEC and DOJ investigation of our China operations.

Supplemental Geographic and Cus

Supplemental Geographic and Customer Solution Set Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Disclosure [Line Items]
Revenue	[1]	$ 428.3	$ 412.8	$ 1,215.5	$ 1,186.6
Risk Management Solutions
Segment Reporting Disclosure [Line Items]
Revenue		262.8	263.9	739.8	740.4
Sales and Marketing Solutions
Segment Reporting Disclosure [Line Items]
Revenue		165.5	148.9	475.7	446.2
Americas [Member]
Segment Reporting Disclosure [Line Items]
Revenue		352	338.8	1,000.1	974.9
Americas [Member] | Risk Management Solutions
Segment Reporting Disclosure [Line Items]
Revenue		202.6	203.6	567.9	565.4
Americas [Member] | Sales and Marketing Solutions
Segment Reporting Disclosure [Line Items]
Revenue		149.4	135.2	432.2	409.5
Non-Americas [Member]
Segment Reporting Disclosure [Line Items]
Revenue		76.3	74	215.4	211.7
Non-Americas [Member] | Risk Management Solutions
Segment Reporting Disclosure [Line Items]
Revenue		60.2	60.3	171.9	175
Non-Americas [Member] | Sales and Marketing Solutions
Segment Reporting Disclosure [Line Items]
Revenue		$ 16.1	$ 13.7	$ 43.5	$ 36.7
[1]	Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively.

Segment Information Segment Inf

Segment Information Segment Information, Assets and Goodwill (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets		$ 2,301				$ 2,209.2
Goodwill		774.6	[1]	$ 770.2	$ 765	651.9	[1]
Goodwill, Period Increase (Decrease)		122.7
Americas [Member]
Segment Reporting Information [Line Items]
Assets	[2]	1,409.7				1,432.6
Goodwill		633.5				550.6
Increase (Decrease) in Operating Assets		22.9
Non-Americas [Member]
Segment Reporting Information [Line Items]
Assets	[3]	698.4				555.9
Goodwill		141.1				101.3
Increase (Decrease) in Operating Assets		(142.5)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets		2,108.1				1,988.5
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Assets	[4]	192.9				$ 220.7
Increase (Decrease) in Operating Assets		$ 27.8
[1]	Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.
[2]	Total assets in the Americas segment at September 30, 2017 decreased by $22.9 million compared to December 31, 2016, primarily driven by a decrease in accounts receivable resulting from the cyclical sales pattern of our Americas business and a decrease in other intangible assets due to normal amortization, partially offset by an increase in total assets as the result of the acquisition of Avention in the first quarter of 2017 (see Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q), and an increase in computer software due to software-related enhancements on products.
[3]	Total assets in the Non-Americas segment at September 30, 2017 increased by $142.5 million compared to December 31, 2016, primarily driven by a net increase in cash as a result of the cyclical pattern of collections in the segment, an increase due to the acquisition of Avention in the first quarter of 2017, and the positive impact of foreign currency translation.
[4]	Total assets in Corporate and Other at September 30, 2017 decreased by $27.8 million compared to December 31, 2016, primarily driven by a net decrease in cash and a decrease in net deferred tax assets due to the acquisition of Avention.

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	$ 1,100,000				$ 1,100,000
Assets, Fair Value Disclosure, Nonrecurring	0				0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal					$ 700,000	$ 89,600,000
Maximum Remaining Maturity of Foreign Currency Derivatives					12 months
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 275,400,000		$ 280,100,000		$ 275,400,000		$ 280,100,000
D&B Credibility Corporation [Member] [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Fair Value subsequent to Acquisition date				$ 9,100,000		9,100,000
Accrued Service-Based Award			14,000,000				14,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Benelux and Latin America [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				89,600,000		$ 89,600,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Benelux [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 700,000	$ 4,600,000	$ 72,100,000			$ 76,700,000

Fair Values of Derivative Instr

Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Assets Derivatives	$ 1.3	$ 1.5
Liabilities Derivative	1.4	1.4
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Assets Derivatives	1.3	1.5
Liabilities Derivative	1.4	1.4
Derivatives not designated as hedging instruments | Other Accrued and Current Liabilities | Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Liabilities Derivative	1.4	1.4
Derivatives not designated as hedging instruments | Other Current Assets | Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Assets Derivatives	$ 1.3	$ 1.5

Effect of Derivative Instrument

Effect of Derivative Instruments on Consolidated Statement of Operations and Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Not Designated as Hedging Instrument [Member] | Forward exchange contracts | Non-Operating Income (Expenses) - Net
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative	$ 3.8	$ 0.9	$ 8.6	$ (5.9)

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2017		Dec. 31, 2016
Assets:
Cash Equivalents (1)		$ 208.2	[1]	$ 238.3	[2]
Liabilities:
Foreign Exchange Forwards (2)		1,076.6		1,063.1
Other Current Assets | Foreign exchange forward contracts
Assets:
Foreign Exchange Forwards (2)		1.3	[3]	1.5	[4]
Other Accrued And Current Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Other Accrued And Current Liabilities [Member] | Foreign exchange forward contracts
Liabilities:
Foreign Exchange Forwards (2)		1.4	[3]	1.4	[4]
Other Noncurrent Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Quoted Prices in Active Markets for Identical Assets (Level I)
Assets:
Cash Equivalents (1)		208.2	[1]	238.3	[2]
Quoted Prices in Active Markets for Identical Assets (Level I) | Other Current Assets | Foreign exchange forward contracts
Assets:
Foreign Exchange Forwards (2)		0	[3]	0	[4]
Quoted Prices in Active Markets for Identical Assets (Level I) | Other Accrued And Current Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Quoted Prices in Active Markets for Identical Assets (Level I) | Other Accrued And Current Liabilities [Member] | Foreign exchange forward contracts
Liabilities:
Foreign Exchange Forwards (2)		0	[3]	0	[4]
Quoted Prices in Active Markets for Identical Assets (Level I) | Other Noncurrent Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Significant Other Observable Inputs (Level II)
Assets:
Cash Equivalents (1)		0	[1]	0	[2]
Significant Other Observable Inputs (Level II) | Other Current Assets | Foreign exchange forward contracts
Assets:
Foreign Exchange Forwards (2)		1.3	[3]	1.5	[4]
Significant Other Observable Inputs (Level II) | Other Accrued And Current Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Significant Other Observable Inputs (Level II) | Other Accrued And Current Liabilities [Member] | Foreign exchange forward contracts
Liabilities:
Foreign Exchange Forwards (2)		1.4	[3]	1.4	[4]
Significant Other Observable Inputs (Level II) | Other Noncurrent Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Significant Unobservable Inputs (Level III)
Assets:
Cash Equivalents (1)		0	[1]	0	[2]
Significant Unobservable Inputs (Level III) | Other Current Assets | Foreign exchange forward contracts
Assets:
Foreign Exchange Forwards (2)		0	[3]	0	[4]
Significant Unobservable Inputs (Level III) | Other Accrued And Current Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			0
Significant Unobservable Inputs (Level III) | Other Accrued And Current Liabilities [Member] | Foreign exchange forward contracts
Liabilities:
Foreign Exchange Forwards (2)		$ 0	[3]	0	[4]
Significant Unobservable Inputs (Level III) | Other Noncurrent Liabilities [Member]
Liabilities:
Contingent Consideration (3)	[5]			$ 0
[1]	Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less.
[2]	Cash equivalents represents fair value as it consists of highly-liquid investments with an initial term from the date of purchase by the Company to maturity of three months or less.
[3]	Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation.
[4]	Primarily represents foreign currency forward contracts. Fair value is determined utilizing a market approach and considers a factor for nonperformance in the valuation.
[5]	Relates to our contingent consideration liability associated with the acquisition of DBCC in the second quarter of 2015. In October 2016, there was an amendment to the Earnout Agreement, replacing it with a service-based award. As a result, in the fourth quarter of 2016, we reversed the balance of the contingent consideration liability of $9.1 million and accrued $14.0 million related to the service-based award associated with 2016. Both adjustments were reflected in “Operating Costs” in our Americas segment in the fourth quarter of 2016. See Note 18 to the consolidated financial statements included in our Annual Report on Form 10-K for further detail.

Carrying Amount and Estimated F

Carrying Amount and Estimated Fair Value of Asset (Liability) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term and Long-term Debt	$ 1,045	$ 1,043.5
Obligations, Fair Value Disclosure	1,076.6	1,063.1
Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable	359	373.7
Loans Payable, Fair Value Disclosure	363.3	383.6
Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit Facilities, Carrying Amount (Asset) Liability	277.6	199.8
Line of Credit Facility, Fair Value of Amount Outstanding	$ 276.8	$ 200.2

Accumulated Other Comprehensi59

Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance			$ (949.6)	$ (965.5)
Other Comprehensive Income before Reclassifications			31.8	(45)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax	$ 6.5	$ 51.9	18.8	63.5
Ending Balance	(899)	(947)	(899)	(947)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance			(266.2)	(291.7)
Other Comprehensive Income before Reclassifications			35.7	(41.1)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax			0	45.8
Ending Balance	(230.5)	(287)	(230.5)	(287)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance			(683.4)	(673.8)
Other Comprehensive Income before Reclassifications			(3.9)	(3.9)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax	6.5	6.1	18.8	17.7
Ending Balance	$ (668.5)	$ (660)	$ (668.5)	$ (660)

Accumulated Other Comprehensi60

Accumulated Other Comprehensive Income (Loss) Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassifications out of AOCI [Line Items]
Total Reclassifications for the Period, Net of Tax	$ 6.5	$ 51.9	$ 18.8	$ 63.5
Cumulative Translation Adjustment
Reclassifications out of AOCI [Line Items]
Total Reclassifications for the Period, Net of Tax			0	45.8
Cumulative Translation Adjustment | Other Nonoperating Income (Expense) [Member]
Reclassifications out of AOCI [Line Items]
Total Reclassifications for the Period, Net of Tax	0	45.8	0	45.8
Amortization of Prior Service Costs | Selling and Administrative Expenses
Reclassifications out of AOCI [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), before Tax	(0.1)	(0.3)	(0.4)	(0.7)
Amortization of Prior Service Costs | Operating Expenses
Reclassifications out of AOCI [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), before Tax	0	(0.1)	(0.2)	(0.3)
Amortization of Actuarial Gain/Loss | Selling and Administrative Expenses
Reclassifications out of AOCI [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), before Tax	6.2	6.4	18.8	18.8
Amortization of Actuarial Gain/Loss | Operating Expenses
Reclassifications out of AOCI [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), before Tax	3.4	3.1	10.2	9.1
Defined Benefit Pension Plans
Reclassifications out of AOCI [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), before Tax	9.5	9.1	28.4	26.9
Tax (Expense) or Benefit	(3)	(3)	(9.6)	(9.2)
Total Reclassifications for the Period, Net of Tax	$ 6.5	$ 6.1	$ 18.8	$ 17.7

Acquisition Acquisition (Detail

Acquisition Acquisition (Details) - USD ($) $ in Millions		Sep. 30, 2017		Mar. 31, 2017	Jan. 09, 2017	Sep. 30, 2017		Jun. 30, 2017	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Purchase Price Allocation [Line Items]
Goodwill, Period Increase (Decrease)									$ 122.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	[1]					$ (2.3)		$ 1.3
Goodwill		$ 774.6	[2]	$ 765		774.6	[2]	770.2	774.6	[2]		$ 651.9	[2]
Payments to Acquire Businesses, Net of Cash Acquired									150		$ 0
Customer Relationships [Member]
Purchase Price Allocation [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	[1]					(1.3)		1
Avention [Member]
Purchase Price Allocation [Line Items]
Equity Method Investment, Ownership Percentage					100.00%
The period of time from the acquisition date when the purchase accounting process is expected to be completed, at the latest					1 year
Goodwill, Period Increase (Decrease)						0.5		0.8
Business Acquisition, Transaction Costs		4.1				4.1			4.1
Cash		4.2		4.2		4.2			4.2
Accounts Receivables		13.6		13.6		13.6			13.6
Other Current Assets		2.3		2.3		2.3			2.3
Current Assets		20.1		20.1		20.1			20.1
Goodwill		114.1		112.8		114.1			114.1
Goodwill, Purchase Accounting Adjustments						0.5		0.8
Other		5.3		5.3		5.3			5.3
Total Assets Acquired		191.3		191		191.3			191.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets						(1.8)		2.1
Deferred Revenue		22.3		23.3		22.3			22.3
Deferred Tax Liability		9		7.7		9			9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities						(1.8)		2.1
Other Liabilities		5.8		5.8		5.8			5.8
Total Liabilities Assumed		37.1		36.8		37.1			37.1
Total Purchase Price		154.2		154.2
Cash Assumed		(4.2)		(4.2)
Payments to Acquire Businesses, Net of Cash Acquired		150		150	$ 150
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					8 years 219 days
Avention [Member] | Customer Relationships [Member]
Purchase Price Allocation [Line Items]
Intangible Assets		30.9		31.2		30.9			30.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						(1.3)		1
Avention [Member] | Technology-Based Intangible Assets [Member]
Purchase Price Allocation [Line Items]
Intangible Assets		14.4		15.8		14.4			14.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						(0.7)		(0.7)
Finite-Lived Intangible Asset, Useful Life					6 years
Avention [Member] | Order or Production Backlog [Member]
Purchase Price Allocation [Line Items]
Intangible Assets		6.5		$ 5.8		6.5			6.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						(0.3)		1
Finite-Lived Intangible Asset, Useful Life					2 years
Avention [Member] | Minimum [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Asset, Useful Life					2 years
Avention [Member] | Minimum [Member] | Customer Relationships [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Asset, Useful Life					10 years
Avention [Member] | Maximum [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Asset, Useful Life					12 years
Avention [Member] | Maximum [Member] | Customer Relationships [Member]
Purchase Price Allocation [Line Items]
Finite-Lived Intangible Asset, Useful Life					12 years
Deferred revenue fair value adjustment [Member] | Avention [Member]
Purchase Price Allocation [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities						0		(1)
Deferred Tax Liability [Member] | Avention [Member]
Purchase Price Allocation [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities						(1.8)		$ 3.1
Americas [Member]
Purchase Price Allocation [Line Items]
Goodwill		633.5				633.5			633.5			550.6
Americas [Member] | Avention [Member]
Purchase Price Allocation [Line Items]
Goodwill		81.3				81.3			81.3
Non-Americas [Member]
Purchase Price Allocation [Line Items]
Goodwill		141.1				141.1			141.1			$ 101.3
Non-Americas [Member] | Avention [Member]
Purchase Price Allocation [Line Items]
Goodwill		$ 32.8				$ 32.8			$ 32.8
[1]	Customer Relationships and Other Definite-Lived Intangibles - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[2]	Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.

Acquisition Acquisition - Pro F

Acquisition Acquisition - Pro Forma Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	[1]	$ (428.3)	$ (412.8)	$ (1,215.5)	$ (1,186.6)
Net Income (Loss) Attributable to Parent	[2]	54.1	(29.4)	114.7	19.4
Avention [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Add: Avention Preacquisition Revenue		0	14.7	0	44.3
Pro Forma Revenue		430	425.8	1,222.2	1,224.2
Pro Forma Net Income Attributable to Dun & Bradstreet Common Shareholders		55.5	(34)	122.1	1.9
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		10.9		33.2
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		(1.6)		(6.6)
Avention [Member] | Fair Value Adjustment to Acquisition Date deferred Revenue [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues		(1.7)	1.7	(6.7)	6.7
Avention [Member] | Pre-Acquisition Net Income (Loss) [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Income (Loss) Attributable to Parent		0	(1.9)	0	(6)
Avention [Member] | Fair Value Adjustment to Acquisition Date deferred Revenue, Net of tax [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Income (Loss) Attributable to Parent		1.4	(1.4)	4.6	(4.6)
Avention [Member] | Amortization for Intangible Assets [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Income (Loss) Attributable to Parent		0	(1.3)	0	(4.1)
Avention [Member] | Acquisition-related Costs [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Income (Loss) Attributable to Parent		$ 0	$ 0	$ 2.8	$ (2.8)
[1]	Reported GAAP revenue includes revenue from Avention since the acquisition date of $10.9 million and $33.2 million for the three month and nine month periods ended September 30, 2017, respectively.
[2]	Reported GAAP Net Income Attributable to Dun & Bradstreet Common Shareholders includes a net loss from Avention since the acquisition date of $1.6 million and $6.6 million for the three month and nine month periods ended September 30, 2017, respectively.

Divestitures and Discontinued63

Divestitures and Discontinued Operations Divestitures (Details) - USD ($) $ in Millions	Nov. 07, 2016	Sep. 30, 2016	Nov. 30, 2016	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from Sales of Business								$ (0.7)	$ (89.6)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Latin America [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments Expected to be Received under the commercial service, trademark license, and technology services agreements		$ 36
Noncash or Part Noncash Divestiture, Amount of Consideration Received		$ 11
Debt Instrument, Term		5 years
Debt Instrument, Interest Rate, Stated Percentage		2.00%					2.00%		2.00%
Repayment of Note Receivable, related to a divestiture				$ 1.2
Repayment of Note Receivable, Annual Principal Amount, related to a divestiture				1
Repayment of Note Receivable, Accrued Interest Amount, related to a divestiture				$ 0.2
Loss from Sales of Business						$ (0.9)	$ (17.5)			$ (18.4)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)										(16.6)
Transaction Costs, Divestiture										4.4
Discontinued Operation, Amounts of Material Contingent Liabilities Remaining						1.8				1.8
Payments for Contingent Liabilities for Businesses Divested related to former employees' benefits								0.7
Payments for Contingent Liabilities for Businesses Divested related to severance								0.3
Commercial Agreement Period		8 years
Cash and Cash Equivalents		$ 1.7					1.7		$ 1.7
Accounts Receivable		0.6					0.6		0.6
Other Current Assets		0.4					0.4		0.4
Goodwill		5.5					5.5		5.5
Other Long Term-Assets		2					2		2
Total Assets		10.2					10.2		10.2
Accrued and Other Current Liabilities		1.7					1.7		1.7
Deferred Revenue		1.6					1.6		1.6
Other Long-Term Liabilities		0.3					0.3		0.3
Liabilities		$ 3.6					3.6		$ 3.6
Transaction Costs paid					$ 0.1	2.7	1.6
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Benelux [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments Expected to be Received under the commercial service, trademark license, and technology services agreements	$ 400
Loss from Sales of Business					(0.7)	(4.6)	(72.1)			(76.7)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)										(72.9)
Transaction Costs, Divestiture										5
Discontinued Operation, Amounts of Material Contingent Liabilities Remaining						0.8				$ 0.8
Payments for Contingent Liabilities for Businesses Divested								$ 0.7
Commercial Agreement Period	15 years
Initial Commercial Services Agreement Period	10 years
Commercial Services Agreement Extension Period	5 years
Proceeds from Divestiture of Businesses	$ 27
Working Capital Adjustment	0.9				$ 0.9
Cash and Cash Equivalents	3.7
Accounts Receivable	12.4
Other Current Assets	0.8
Goodwill	31.4
Other Long Term-Assets	0.8
Total Assets	49.1
Accrued and Other Current Liabilities	5.3
Deferred Revenue	18
Other Long-Term Liabilities	0
Liabilities	$ 23.3
Transaction Costs paid						$ 3.5	$ 1.5
Proceeds from Divestiture of Businesses, Net of Cash Divested			$ 24
Payment expected to be made related to a working capital adjustment			$ 0.2

Divestitures and Discontinued64

Divestitures and Discontinued Operations Discontinued Operations (Details) - Australia & New Zealand Business [Member] - Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] - USD ($) $ in Millions	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 169.8
Proceeds from Divestiture of Businesses	$ 159.7
Proceeds from Divestiture of Businesses, Related to a working capital adjustment	0.7
Escrow Deposit	$ 10.1
Period during which escrow funds may be used		3 years
Discontinued Operation, Amounts of Material Contingent Liabilities Remaining					$ 10.1
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			$ (0.8)	$ (0.9)
Initial Commercial Services Agreement Period		5 years
Royalty payments to be received		$ 8
Trademark License Agreement Period		5 years

Goodwill and other Intangible65

Goodwill and other Intangibles (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016
Goodwill and Other Intangible Assets [Roll Forward]
Computer Software, Beginning Balance		$ 123		$ 113.6		$ 108.1
Goodwill, Beginning Balance		770.2		765		651.9	[1]
Computer Software, Acquisitions (1)	[2]	0		0		0.6
Computer Software, Additions at Cost (2)	[3]	14.5		14.5		12.7
Goodwill, Acquisitions (1)	[2]	0.5		0.8		112.8
Computer Software, Amortization		(8.9)		(7.8)		(7.7)
Capitalized Computer Software, Impairments		(1.1)
Computer Software Other (3)	[4]	2		2.7		(0.1)
Goodwill, Other (3)	[4]	3.9		4.4		0.3
Computer Software, Ending Balance		129.5		123		113.6
Goodwill, Ending Balance		774.6	[1]	770.2		765
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	[5]	334.4		340.8		296.1
Finite-lived Intangible Assets Acquisitions (5)	[6]					52.8
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	[6]	(2.3)		1.3
Additions at Cost		0.3		0.2		0
Amortization of Intangible Assets		(7.9)		(8.4)		(8.2)
Other		0		0.5		0.1
Ending Balance		324.5		334.4	[5]	340.8	[5]
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization		36.7		32.9		28.8		$ 25.1
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	[5]	99.8		102.2		74.6
Finite-lived Intangible Assets Acquisitions (5)	[6]					31.2
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	[6]	(1.3)		1
Additions at Cost		0		0		0
Amortization of Intangible Assets		(3.7)		(3.8)		(3.7)
Other		0		0.4		0.1
Ending Balance		94.8		99.8	[5]	102.2	[5]
Patents and Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization		99		100.7		95.4		$ 91.2
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	[5]	76.2		80.2		63.1
Finite-lived Intangible Assets Acquisitions (5)	[6]					21.6
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	[6]	(1)		0.3
Additions at Cost		0.3		0.2		0
Amortization of Intangible Assets		(4.2)		(4.6)		(4.5)
Other		0		0.1		0
Ending Balance		71.3		76.2	[5]	80.2	[5]
Other Intangible Assets [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	[5]	158.4		158.4		158.4
Indefinite-lived Intangible Assets Acquisitions (5)	[6]	0		0		0
Additions at Cost		0		0		0
Amortization of Intangible Assets		0		0		0
Other		0		0		0
Ending Balance		$ 158.4		$ 158.4	[5]	$ 158.4	[5]
[1]	Goodwill increased by $122.7 million at September 30, 2017 compared to December 31, 2016, primarily as the result of the acquisition of Avention in the first quarter of 2017.
[2]	Computer Software and Goodwill - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.
[3]	Computer Software - Primarily due to software-related enhancements on products and the purchase of third party licenses.
[4]	Computer Software and Goodwill - Primarily due to the impact of foreign currency fluctuations.
[5]	Customer Relationships - Net of accumulated amortization of $36.7 million, $32.9 million, $28.8 million and $25.1 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively. Other Definite-Lived Intangibles - Net of accumulated amortization of $99.0 million, $100.7 million, $95.4 million and $91.2 million as of September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively.
[6]	Customer Relationships and Other Definite-Lived Intangibles - Related to the acquisition of Avention. See Note 13 to our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q.

Contractual Obligations Contr66

Contractual Obligations Contractual Obligations (Details) $ in Millions	Mar. 31, 2017USD ($)
Purchase Obligation, 2017	$ 138.5
Purchase Obligation, 2018	76.7
Purchase Obligation, 2019	45.3
Purchase Obligation, 2020	36.3
Purchase Obligation, 2021	29.8
Purchase Obligation, Thereafter	12.4
Purchase Obligations	339
Convergys Customer Management Group [Member]
Reduction of Commitment	19
Expected Future Payments	$ 70

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	Oct. 31, 2017$ / shares
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declared (in dollars per share)	$ 0.5025