Moody's (MCO) 10-Q 1 Aug 19 2019 Q2 Quarterly report Financial data

Document - Document and Entity

Document - Document and Entity Information - $ / shares shares in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Cover [Abstract]
Document Type	10-Q
Entity Registrant Name	MOODYS CORP /DE/
Entity Central Index Key	0001059556
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Period Focus	Q2
Entity Address, Address Line One	7 World Trade Center
Entity Address, Address Line Two	250 Greenwich Street
Entity Address City Or Town	New York
Entity Address, State Or Province	NY
Entity Address Postal Zip Code	10007
Phone Fax Number Description	Registrant’s telephone number, including area code:
City Area Code	(212)
Local Phone Number	553-0300
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Trading Symbol	MCO
Entity Common Stock Shares Outstanding	189.2
Common Stock Par Or Stated Value Per Share	$ 0.01	$ 0.01
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Security Exchange Name	NYSE
Entity File Number	1-14037
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	13-3998945
Document Quarterly Report	true
Document Transition Report	false
Security 12b Title	Common Stock
Entity Ex Transition Period	false

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)
Revenues	$ 1,213.6	$ 1,175.1	$ 2,355.7	$ 2,301.8
Expenses
Operating	339.9	320.2	681.6	635.1
Selling, general and administrative	274.7	270.5	556.2	541.6
Restructuring	53.8		59.3
Depreciation and amortization	51	48.4	101.3	97.5
Acquisition-Related Expenses	2	2	3.4	2.8
Long-lived asset impairment pursuant to the divestiture of MAKS	8.7		8.7
Total expenses	730.1	641.1	1,410.5	1,277
Operating Income	483.5	534	945.2	1,024.8
Non-operating (expense) income, net
Interest expense, net	(50.6)	(53.4)	(103.1)	(104.1)
Other non-operating income, net	0.4	14.9	2.7	15.9
Total non-operating (expense) income, net	(50.2)	(38.5)	(100.4)	(88.2)
Income before provisions for income taxes	433.3	495.5	844.8	936.6
Provision for income taxes	121.3	117.6	159.2	181.9
Net income	312	377.9	685.6	754.7
Less: Net income attributable to noncontrolling interests	1.7	1.7	2.4	5.6
Net income attributable to Moody's	$ 310.3	$ 376.2	$ 683.2	$ 749.1
Earnings per share attributable to Moody's common shareholders
Basic	$ 1.64	$ 1.96	$ 3.60	$ 3.91
Diluted	$ 1.62	$ 1.94	$ 3.56	$ 3.85
Weighted average number of shares outstanding
Basic	189.4	191.9	189.9	191.6
Diluted	191.3	194.4	192.1	194.5

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 312	$ 377.9	$ 685.6	$ 754.7
Foreign currency translation:
Foreign currency translation adjustments - Pre Tax	41.6	(286.9)	14.9	(150.8)
Foreign currency translation adjustments - Net of Tax	41.6	(286.9)	14.9	(150.8)
Net gains (losses) on net investment hedges - Pre Tax	(37)	36.6	(6.6)	22.1
Net gains (losses) on net investment hedges, Tax	7.8	(9.2)	0.9	(5.6)
Net gains (losses) on net investment hedges, Net of Tax	(29.2)	27.4	(5.7)	16.5
Cash flow hedges:
Net realized and unrealized gain (loss) on cash flow hedges - Pre Tax				1.9
Net realized and unrealized gain (loss) on cash flow hedges - Tax				(0.4)
Net realized and unrealized gain (loss) on cash flow hedges - Net of Tax				1.5
Reclassification of losses included in net income - Pre Tax	0.1	(0.1)	0.1	(0.2)
Reclassification of losses included in net income - Tax
Reclassification of losses included in net income- Net of Tax	0.1	(0.1)	0.1	(0.2)
Pension and Other Retirement Benefits:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	0.8	1	1.6	2.4
Amortization of actuarial losses and prior service costs included in net income - Tax	(0.2)	(0.3)	(0.4)	(0.7)
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	0.6	0.7	1.2	1.7
Net actuarial losses and prior service costs - Pre Tax	(2.8)	1.6	(1.7)	1.6
Net actuarial losses and prior service costs - Tax	0.7	(0.4)	0.4	(0.4)
Net actuarial losses and prior service costs - Net of Tax	(2.1)	1.2	(1.3)	1.2
Total other comprehensive (loss) income - Pre Tax	2.7	(247.8)	8.3	(123)
Total other comprehensive (loss)income - Tax	8.3	(9.9)	0.9	(7.1)
Total other comprehensive (loss) income - Net of Tax	11	(257.7)	9.2	(130.1)
Comprehensive income	323	120.2	694.8	624.6
Less: Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interest	3.4	(3.2)	11.6	5.7
Comprehensive income attributable to Moody's	$ 319.6	$ 123.4	$ 683.2	$ 618.9

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,195,900,000	$ 1,685,000,000
Short-term investments	119,500,000	132,500,000
Accounts receivable, net of allowances of $36.9 in 2018 and $36.6 in 2017	1,245,300,000	1,287,100,000
Other current assets	335,800,000	282,300,000
Assets held for sale	258,100,000
Total current assets	3,154,600,000	3,386,900,000
Property and equipment, net of accumulated depreciation of $767.9 in 2018 and $706.0 in 2017	300,400,000	320,400,000
Operating lease right-of-use assets	476,800,000
Goodwill	3,664,900,000	3,781,300,000
Intangible assets, net	1,486,000,000	1,566,100,000
Deferred tax assets, net	191,400,000	197,200,000
Other assets	317,500,000	274,300,000
Total assets	9,591,600,000	9,526,200,000
Current liabilities:
Accounts payable and accrued liabilities	588,700,000	695,200,000
Current portion of operating lease liabilities	89,100,000
Commercial paper	129,900,000
Current portion of long-term debt		449,900,000
Deferred revenue	952,300,000	953,400,000
Liabilities held for sale	79,900,000
Total current liabilities	1,839,900,000	2,098,500,000
Non-current portion of deferred revenue	118,500,000	122,300,000
Long-term debt	5,258,000,000	5,226,100,000
Deferred tax liabilities, net	348,600,000	351,700,000
Uncertain tax positions	450,200,000	494,600,000
Operating lease liabilities	510,200,000
Other liabilities	491,500,000	576,500,000
Total liabilities	9,016,900,000	8,869,700,000
Contingencies (Note 19)
Shareholders' (deficit) equity
Preferred stock, par value $.01 per share; 10,000,000 shares authorized; no shares issued and outstanding
Common stock	3,400,000	3,400,000
Capital surplus	574,500,000	600,900,000
Retained earnings	9,107,700,000	8,594,400,000
Treasury stock, at cost; 151,293,579 and 151,932,157 shares of common stock at September 30, 2018 and December 31, 2017, respectively	(8,886,700,000)	(8,312,500,000)
Accumulated other comprehensive loss	(446,100,000)	(426,300,000)
Total Moody's shareholders' deficit	352,800,000	459,900,000
Noncontrolling interests	221,900,000	196,600,000
Total shareholders' deficit	574,700,000	656,500,000
Total liabilities and shareholders' (deficit) equity	9,591,600,000	9,526,200,000
Series common stock
Shareholders' (deficit) equity
Common stock

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable, allowances	$ 44.8	$ 43.5
Property and equipment, accumulated depreciation	$ 797	$ 790.2
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	342,902,272	342,902,272
Treasury stock, shares	153,740,656	151,598,695
Series common stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 685.6	$ 754.7
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	101.3	97.5
Stock-based compensation expense	69.9	69.5
Deferred income taxes	(3)	(12.1)
ROU Asset impairment & other non-cash restructuring charge	28.9
Long-lived asset impairment pursuant to the divestiture of MAKS	8.7
Changes in assets and liabilities:
Accounts receivable	30.4	17.8
Other current assets	(58.2)	(10.2)
Other assets	(28.6)	(14.3)
Lease obligations	(3.8)
Accounts payable and accrued liabilities	(95.9)	(163.2)
Unrecognized tax benefits and other non-current tax liabilities	(15.4)	(33.6)
Deferred revenue	(8.1)	55.3
Other liabilities	42.7	15.9
Net cash provided by (used in) operating activities	754.5	777.3
Cash flows from investing activities
Capital additions	(38.7)	(37.9)
Purchases of investments	(69.9)	(92.2)
Sales and maturities of short-term investments	92.5	79.1
Cash received upon diposal of a subsidiary, net of cash transferred to purchaser		5.7
Cash paid for acquisitions, net of cash acquired and equity investments	(36.7)
Net cash used in investing activities	(52.8)	(45.3)
Cash flows from financing activities
Issuance of notes		299.6
Repayments of notes	(450)	(450)
Issuance of commercial paper	942.4	359.4
Repayments of commercial paper	(815)	(399.4)
Proceeds from stock-based compensation plans	28.8	36.9
Repurchase of shares related to stock-based compensation	(74.9)	(61.5)
Treasury shares	(615.2)	(81)
Dividends	(189)	(168.6)
Dividends to noncontrolling interests	(0.8)	(1.3)
Payment for noncontrolling interest	(12.3)
Debt issuance costs, extinguishment costs and related fees		(1.7)
Net cash provided (used in) by financing activities	(1,186)	(467.6)
Less: Reclassification of cash to assets held-for-sale	(8)
Effect of exchange rate changes on cash and cash equivalents	3.2	(21.4)
Net increase (decrease) in cash and cash equivalents	(489.1)	243
Cash and cash equivalents, beginning of the period	1,685	1,071.5
Cash and cash equivalents, end of the period	$ 1,195.9	$ 1,314.5

CONSOLIDATED STATEMENT OF SHARE

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings [Member]	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total Moody's Shareholders' Equity (Deficit)	Noncontrolling Interests
Beginning Balance (in shares) at Dec. 31, 2017		342.9			(151.9)
Beginning Balance at Dec. 31, 2017	$ (114.9)	$ 3.4	$ 528.6	$ 7,465.4	$ (8,152.9)	$ (172.2)	$ (327.7)	$ 212.8
Net income	754.7			749.1			749.1	5.6
Dividends	(169.7)			(168.3)			(168.3)	(1.4)
Stock-based compensation	69.5		69.5				69.5
Shares issued for stock-based compensation plans, net	(24.5)		(59.5)		$ 35		(24.5)
Stock Issued During Period Shares Share Based Compensation					1.4
Treasury shares repurchased, shares					(0.5)
Treasury shares repurchased	(81)				$ (81)		(81)
Foreign currency translation adjustments - Net of Tax	(134.3)					(134.5)	(134.5)	0.2
Net actuarial losses and prior service costs - Net of Tax	1.2					1.2	1.2
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	1.7					1.7	1.7
Net realized and unrealized gain on cash flow hedges (net of tax of $1.1 million)	1.3					1.3	1.3
Ending Balance (in shares) at Jun. 30, 2018		342.9			(151)
Ending Balance at Jun. 30, 2018	460.1	$ 3.4	538.6	8,204.6	$ (8,198.9)	(304.8)	242.9	217.2
Beginning Balance (in shares) at Mar. 31, 2018		342.9			(151)
Beginning Balance at Mar. 31, 2018	420	$ 3.4	506.6	7,913	$ (8,171.4)	(51.9)	199.7	220.3
Net income	377.9			376.2			376.2	1.7
Dividends	(84.6)			(84.6)			(84.6)
Stock-based compensation	34.3		34.3				34.3
Shares issued for stock-based compensation plans, net	7.8		(2.3)		$ 10.1		7.8
Stock Issued During Period Shares Share Based Compensation					0.2
Treasury shares repurchased, shares					(0.2)
Treasury shares repurchased	(37.6)				$ (37.6)		(37.6)
Foreign currency translation adjustments - Net of Tax	(259.5)					(254.7)	(254.7)	(4.8)
Net actuarial losses and prior service costs - Net of Tax	1.2					1.2	1.2
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	0.7					0.7	0.7
Net realized and unrealized gain on cash flow hedges (net of tax of $1.1 million)	(0.1)					(0.1)	(0.1)
Ending Balance (in shares) at Jun. 30, 2018		342.9			(151)
Ending Balance at Jun. 30, 2018	460.1	$ 3.4	538.6	8,204.6	$ (8,198.9)	(304.8)	242.9	217.2
Adoption of new ASU | New Revenue Accounting Standard [Member]	(156.1)			(156.1)			(156.1)
Adoption of new ASU | Financial Instruments - Overall (ASU 2016-01) [Member]				(2.3)		2.3
Beginning Balance (in shares) at Dec. 31, 2018		342.9			(151.6)
Beginning Balance at Dec. 31, 2018	656.5	$ 3.4	600.9	8,594.4	$ (8,312.5)	(426.3)	459.9	196.6
Net income	685.6			683.2			683.2	2.4
Dividends	(190.5)			(189.7)			(189.7)	(0.8)
Stock-based compensation	70.1		70.1				70.1
Shares issued for stock-based compensation plans, net	(46.1)		(71.4)		$ 25.3		(46.1)
Stock Issued During Period Shares Share Based Compensation					1.3
Purchase of noncontrolling interest	(12.3)		(9.4)				(9.4)	(2.9)
Non-controlling interest resulting from majority acquisition of Vigeo Eiris	17.4							17.4
Treasury shares repurchased, shares					(3.4)
Treasury shares repurchased	(615.2)	$ (15.7)			$ (599.5)		(615.2)
Foreign currency translation adjustments - Net of Tax	9.2							9.2
Net actuarial losses and prior service costs - Net of Tax	(1.3)					(1.3)	(1.3)
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	1.2					1.2	1.2
Net realized and unrealized gain on cash flow hedges (net of tax of $1.1 million)	0.1					0.1	0.1
Ending Balance (in shares) at Jun. 30, 2019		342.9			(153.7)
Ending Balance at Jun. 30, 2019	574.7	$ 3.4	574.5	9,107.7	$ (8,886.7)	(446.1)	352.8	221.9
Beginning Balance (in shares) at Mar. 31, 2019		342.9			(153.3)
Beginning Balance at Mar. 31, 2019	325	$ 3.4	435.7	8,893.6	$ (8,754)	(455.5)	123.2	201.8
Net income	312			310.3			310.3	1.7
Dividends	(96.8)			(96.2)			(96.2)	(0.6)
Stock-based compensation	34.3		34.3				34.3
Shares issued for stock-based compensation plans, net	13.5		(5.1)		$ 18.6		13.5
Stock Issued During Period Shares Share Based Compensation					0.3
Non-controlling interest resulting from majority acquisition of Vigeo Eiris	17.4							17.4
Treasury shares repurchased, shares					(0.7)
Treasury shares repurchased	(41.7)		109.6		$ (151.3)		(41.7)
Foreign currency translation adjustments - Net of Tax	12.4					10.8	10.8	1.6
Net actuarial losses and prior service costs - Net of Tax	(2.1)					(2.1)	(2.1)
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	0.6					0.6	0.6
Net realized and unrealized gain on cash flow hedges (net of tax of $1.1 million)	0.1					0.1	0.1
Ending Balance (in shares) at Jun. 30, 2019		342.9			(153.7)
Ending Balance at Jun. 30, 2019	$ 574.7	$ 3.4	$ 574.5	9,107.7	$ (8,886.7)	(446.1)	$ 352.8	$ 221.9
Adoption of new ASU | Accounting Standards Update 2018-02 [Member]				$ (19.8)		$ 19.8

CONSOLIDATED STATEMENT OF SHA_2

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Stockholders Equity [Abstract]
Dividends declared per share attributable to Moody's common shareholders	$ 0.50	$ 0.44	$ 1	$ 0.88
Currency translation adjustment, tax	$ (7.8)	$ 9.2	$ (0.9)	$ 5.6
Net actuarial losses and prior service costs - Tax	(0.7)	0.4	(0.4)	0.4
Amortization of actuarial losses and prior service costs included in net income - Tax	$ 0.2	$ 0.3	$ 0.4	0.7
Net unrealized gain on cash flow hedges, tax				$ 0.4

DESCRIPTION OF BUSINESS AND BAS

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
	Jun. 30, 2019
Description of Business and Basis of Presentation [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	NOTE 1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Moody’s is a provider of (i) credit ratings; (ii) credit, capital markets and economic research, data and analytical tools; (iii) software solutions that support financial risk management activities; (iv) quantitatively derived credit scores; (v) learning solutions and certification services; (vi) offshore financial research and analytical services; and (vii) company information and business intelligence products. Moody’s reports in two MIS, the credit rating agency, publishes credit ratings on a wide range of debt obligations and the entities that issue such obligations in markets worldwide. Revenue is primarily derived from the originators and issuers of such transactions who use MIS ratings in the distribution of their debt issues to investors. Additionally, MIS earns revenue from certain non-ratings-related operations which consist primarily of financial instrument pricing services in the Asia-Pacific region as well as revenue from ICRA’s non-ratings operations. The revenue from these operations is included in the MIS Other LOB and is not material to the results of the MIS segment. MA provides financial intelligence and analytical tools to assist businesses in making decisions. MA’s portfolio of solutions consists of specialized research, data, software, and professional services, which are assembled to support the financial analysis and risk management activities of institutional customers worldwide. Following a strategic review of its business portfolio, the Company initiated a plan to sell MAKS and determined that all of the criteria had been met to classify the assets and liabilities of MAKS as held for sale as of June 30, 2019. On July 16, 2019, the Company entered into an agreement to sell the MAKS business to Equistone Partners Europe Limited, a European private equity firm. The operating results of MAKS will continue to be reported within the MA segment (and PS LOB) until the closing of the transaction, which is expected to occur in the second half of 2019. These interim financial statements have been prepared in accordance with the instructions to Form 10-Q and should be read in conjunction with the Company’s consolidated financial statements and related notes in the Company’s 2018 annual report on Form 10-K filed with the SEC on February 25, 2019. The results of interim periods are not necessarily indicative of results for the full year or any subsequent period. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the periods presented have been included. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Certain reclassifications have been made to prior period amounts to conform to the current presentation. Adoption of New Accounting Standards On January 1, 2019, the Company adopted ASU No. 2016-02, “Leases (Topic 842)” and has elected to apply the provisions of the New Lease Accounting Standard on the date of adoption with adjustments to the assets and liabilities on its opening balance sheet, with no cumulative-effect adjustment to the opening balance of retained earnings required. Accordingly, the Company did not restate prior year comparative periods for the impact of the New Lease Accounting Standard. The New Lease Accounting Standard requires lessees to recognize an ROU Asset and lease liability for all leases with terms of more than 12 months. The Company has elected the package of practical expedients permitted under the transition guidance within the New Lease Accounting Standard, which permits the Company not to reassess the following for any expired or existing contracts: i) whether any contracts contain leases; ii) lease classification (i.e. operating lease or finance/capital lease); and iii) initial direct costs. The adoption of the New Lease Accounting Standard resulted in the recognition of an ROU Assets and lease liabilities of approximately $ 518 million and $ 622 million, respectively, at January 1, 2019, consisting primarily of operating leases relating to office space. Pursuant to this transition adjustment, the Company also recognized approximately $ 150 million and approximately $ 125 million in additional deferred tax assets and liabilities, respectively. Compared to previous guidance, the New Lease Accounting Standard does not significantly change the method by which a lessee should recognize, measure and present expenses and cash flows arising from a lease. Refer to Note 2 for a more fulsome description of the Company’s accounting policy relating to the New Lease Accounting Standard, which includes a discussion relating to the pattern of operating lease expense recognition (both prior to and subsequent to an impairment of a ROU Asset). In the first quarter of 2019, the Company adopted ASU No. 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”. Under current GAAP, adjustments to deferred tax assets and liabilities related to a change in tax laws or rates are included in income from continuing operations, even in situations where the related items were originally recognized in OCI (commonly referred to as a “stranded tax effect”). The provisions of this ASU permit the reclassification of the stranded tax effect related to the Tax Act from AOCI to retained earnings. In the first quarter of 2019, the Company reclassified $ 19.8 million of tax benefits from AOCI to retained earnings relating to the aforementioned stranded tax effect of the Tax Act. On January 1, 2019, the Company adopted ASU No. 2018-16, “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes”. The amendments in this ASU permit the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under ASC 815, in addition to the currently permissible benchmark interest rates. This ASU provides the Company the ability to utilize the OIS rate based on SOFR as the benchmark interest rate on certain hedges of interest rate risk. The adoption of this ASU had no impact on the Company’s financial statements upon adoption. Reclassification of Previously Reported Revenue by LOB There were certain organizational/product realignments in both MIS and MA in the first quarter of 2019. Accordingly, in MIS, revenue from REITs, which was previously classified in the SFG LOB, is now classified in the CFG LOB. In MA, revenue relating to the Bureau van Dijk FACT product (a credit assessment and origination solution), which was previously classified in RD&A, is now classified in the ERS LOB. Accordingly, 2018 revenue by LOB was reclassified to conform with this new presentation, as follows: MIS As previously reported Reclassification As Reclassified MA As previously reported Reclassification As Reclassified CFG RD&A Q1 $ 377.7 $ 11.9 $ 389.6 Q1 $ 269.2 $ ( 2.1) $ 267.1 Q2 377.6 13.4 391.0 Q2 279.9 ( 4.0) 275.9 Q3 296.1 11.2 307.3 Q3 282.6 ( 2.3) 280.3 Q4 282.7 8.6 291.3 Q4 302.4 ( 5.3) 297.1 Full year 2018 $ 1,334.1 $ 45.1 $ 1,379.2 Full year 2018 $ 1,134.1 $ ( 13.7) $ 1,120.4 SFG ERS Q1 $ 129.7 $ ( 11.9) $ 117.8 Q1 $ 100.1 $ 2.1 $ 102.2 Q2 141.6 ( 13.4) 128.2 Q2 105.5 4.0 109.5 Q3 125.4 ( 11.2) 114.2 Q3 113.0 2.3 115.3 Q4 129.8 ( 8.6) 121.2 Q4 118.8 5.3 124.1 Full year 2018 $ 526.5 $ ( 45.1) $ 481.4 Full year 2018 $ 437.4 $ 13.7 $ 451.1

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES On January 1, 2019, the Company adopted the New Lease Accounting Standard as more fully discussed in Note 1. Accordingly, the Company revised its lease accounting policy to reflect the provisions of the new standard, which is discussed below. All other significant accounting policies described in the Form 10-K for the year ended December 31, 2018 remain unchanged. Additionally, refer to Note 19 for additional disclosures relating to the Company’s lease obligations. Leases The Company has operating leases, of which substantially all relate to the lease of office space. The Company’s leases which are classified as finance leases are not material to the condensed consolidated financial statements. The Company determines if an arrangement meets the definition of a lease at contract inception. The Company recognizes in its consolidated balance sheet a lease liability and an ROU Asset for all leases with a lease term greater than 12 months. In determining the length of the lease term, the Company utilizes judgment in assessing the likelihood of whether it is reasonably certain that it will exercise an option to extend or early-terminate a lease, if such options are provided in the lease agreement. ROU Assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU Assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As substantially all of the Company’s leases do not provide an implicit interest rate, the Company uses its estimated secured incremental borrowing rates at the lease commencement date in determining the present value of lease payments. These secured incremental borrowing rates are attributable to the currency in which the lease is denominated. At commencement, the Company’s initial measurement of the ROU Asset is calculated as the present value of the remaining lease payments (i.e., lease liability), with additive adjustments reflecting: initial direct costs (e.g., broker commissions) and prepaid lease payments (if any); and reduced by any lease incentives provided by the lessor if: (i) received before lease commencement or (ii) receipt of the lease incentive is contingent upon future events for which the occurrence is both probable and within the Company’s control. Lease expense for minimum operating lease payments is recognized on a straight-line basis over the lease term. This straight-line lease expense represents a single lease cost which is comprised of both an interest accretion component relating to the lease liability and amortization of the ROU Assets. The Company records this single lease cost in operating and SG&A expenses. However, in situations where an operating lease ROU Asset has been impaired, the subsequent amortization of the ROU Asset is then recorded on a straight-line basis over the remaining lease term and is combined with accretion expense on the lease liability to result in single operating lease cost (which subsequent to impairment will no longer follow a straight-line recognition pattern). The Company has lease agreements which include lease and non-lease components. For the Company’s office space leases, the lease components (e.g., fixed rent payments) and non-lease components (e.g., fixed common-area maintenance costs) are combined and accounted for as a single lease component. Variable lease payments (e.g. variable common-area-maintenance costs) are only included in the initial measurement of the lease liability to the extent those payments depend on an index or a rate. Variable lease payments not included in the lease liability are recognized in net income in the period in which the obligation for those payments is incurred.

REVENUES

REVENUES	6 Months Ended
	Jun. 30, 2019
Revenues [Abstract]
REVENUES	NOTE 3. REVENUES Revenue by Category The following table presents the Company’s revenues disaggregated by LOB: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 MIS: Corporate finance (CFG) (1) Investment-grade $ 95.8 $ 72.4 $ 193.2 $ 159.6 High-yield 68.2 58.7 125.5 116.6 Bank loans 83.5 121.3 156.1 231.4 Other accounts (2) 139.9 138.6 268.0 273.0 Total CFG 387.4 391.0 742.8 780.6 Structured finance (SFG) (1) Asset-backed securities 25.6 27.9 48.8 56.1 RMBS 24.1 26.8 47.6 51.1 CMBS 20.4 18.2 38.1 39.5 Structured credit 41.0 54.5 76.2 97.9 Other accounts 1.0 0.8 2.1 1.4 Total SFG 112.1 128.2 212.8 246.0 Financial institutions (FIG) Banking 84.6 77.3 164.2 154.3 Insurance 28.1 32.9 57.1 61.2 Managed investments 9.5 7.2 13.5 12.9 Other accounts 3.0 3.2 6.2 6.5 Total FIG 125.2 120.6 241.0 234.9 Public, project and infrastructure finance (PPIF) Public finance / sovereign 53.0 51.7 99.2 98.6 Project and infrastructure 55.6 56.4 102.1 102.7 Total PPIF 108.6 108.1 201.3 201.3 Total ratings revenue 733.3 747.9 1,397.9 1,462.8 MIS Other 5.1 4.4 10.6 9.4 Total external revenue 738.4 752.3 1,408.5 1,472.2 Intersegment royalty 33.0 30.6 65.3 60.4 Total MIS 771.4 782.9 1,473.8 1,532.6 MA: Research, data and analytics (RD&A) (3) 315.3 275.9 623.0 543.0 Enterprise risk solutions (ERS) (3) 117.7 109.5 239.6 211.7 Professional services (PS) 42.2 37.4 84.6 74.9 Total external revenue 475.2 422.8 947.2 829.6 Intersegment revenue 2.2 2.4 4.6 7.4 Total MA 477.4 425.2 951.8 837.0 Eliminations ( 35.2) ( 33.0) ( 69.9) ( 67.8) Total MCO $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8 (1) (2) (3) The following table presents the Company’s revenues disaggregated by LOB and geographic area: Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 U.S. Non-U.S. Total U.S. Non-U.S. Total MIS: Corporate finance (CFG) (1) $ 242.6 $ 144.8 $ 387.4 $ 255.2 $ 135.8 $ 391.0 Structured finance (SFG) (1) 71.9 40.2 112.1 80.4 47.8 128.2 Financial institutions (FIG) 52.2 73.0 125.2 54.4 66.2 120.6 Public, project and infrastructure finance (PPIF) 69.4 39.2 108.6 61.1 47.0 108.1 Total ratings revenue 436.1 297.2 733.3 451.1 296.8 747.9 MIS Other 0.1 5.0 5.1 0.1 4.3 4.4 Total MIS 436.2 302.2 738.4 451.2 301.1 752.3 MA: Research, data and analytics (RD&A) (2) 137.8 177.5 315.3 118.2 157.7 275.9 Enterprise risk solutions (ERS) (2) 46.1 71.6 117.7 42.6 66.9 109.5 Professional services (PS) 17.8 24.4 42.2 13.4 24.0 37.4 Total MA 201.7 273.5 475.2 174.2 248.6 422.8 Total MCO $ 637.9 $ 575.7 $ 1,213.6 $ 625.4 $ 549.7 $ 1,175.1 Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 U.S. Non-U.S. Total U.S. Non-U.S. Total MIS: Corporate finance (CFG) (1) $ 485.2 $ 257.6 $ 742.8 $ 512.5 $ 268.1 $ 780.6 Structured finance (SFG) (1) 134.1 78.7 212.8 154.4 91.6 246.0 Financial institutions (FIG) 98.2 142.8 241.0 102.9 132.0 234.9 Public, project and infrastructure finance (PPIF) 129.6 71.7 201.3 114.5 86.8 201.3 Total ratings revenue 847.1 550.8 1,397.9 884.3 578.5 1,462.8 MIS Other 0.3 10.3 10.6 0.3 9.1 9.4 Total MIS 847.4 561.1 1,408.5 884.6 587.6 1,472.2 MA: Research, data and analytics (RD&A) (2) 272.6 350.4 623.0 230.8 312.2 543.0 Enterprise risk solutions (ERS) (2) 94.5 145.1 239.6 81.1 130.6 211.7 Professional services (PS) 35.5 49.1 84.6 26.6 48.3 74.9 Total MA 402.6 544.6 947.2 338.5 491.1 829.6 Total MCO $ 1,250.0 $ 1,105.7 $ 2,355.7 $ 1,223.1 $ 1,078.7 $ 2,301.8 (1) (2) The following table presents the Company’s reportable segment revenues disaggregated by segment and geographic region: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 MIS: U.S. $ 436.2 $ 451.2 $ 847.4 $ 884.6 Non-U.S.: EMEA 178.3 181.1 326.8 362.2 Asia-Pacific 83.9 79.6 162.8 152.2 Americas 40.0 40.4 71.5 73.2 Total Non-U.S. 302.2 301.1 561.1 587.6 Total MIS 738.4 752.3 1,408.5 1,472.2 MA: U.S. 201.7 174.2 402.6 338.5 Non-U.S.: EMEA 184.4 175.0 368.5 341.2 Asia-Pacific 56.9 44.1 110.2 91.7 Americas 32.2 29.5 65.9 58.2 Total Non-U.S. 273.5 248.6 544.6 491.1 Total MA 475.2 422.8 947.2 829.6 Total MCO $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8 The following tables summarize the split between transaction and relationship revenue. In the MIS segment, excluding MIS Other, transaction revenue represents the initial rating of a new debt issuance as well as other one-time fees while relationship revenue represents the recurring monitoring fees of a rated debt obligation and/or entities that issue such obligations, as well as revenue from programs such as commercial paper, medium-term notes and shelf registrations. In MIS Other, transaction revenue represents revenue from professional services and outsourcing engagements and relationship revenue represents subscription-based revenues. In the MA segment, relationship revenue represents subscription-based revenues and software maintenance revenue. Transaction revenue in MA represents perpetual software license fees and revenue from software implementation services, risk management advisory projects, training and certification services, and outsourced research and analytical engagements. Three Months Ended June 30, 2019 2018 Transaction Relationship Total Transaction Relationship Total Corporate Finance $ 276.4 $ 111.0 $ 387.4 $ 284.5 $ 106.5 $ 391.0 71% 29% 100% 73% 27% 100% Structured Finance $ 68.2 $ 43.9 $ 112.1 $ 85.2 $ 43.0 $ 128.2 61% 39% 100% 66% 34% 100% Financial Institutions $ 61.2 $ 64.0 $ 125.2 $ 56.2 $ 64.4 $ 120.6 49% 51% 100% 47% 53% 100% Public, Project and Infrastructure Finance $ 71.4 $ 37.2 $ 108.6 $ 69.6 $ 38.5 $ 108.1 66% 34% 100% 64% 36% 100% MIS Other $ 0.4 $ 4.7 $ 5.1 $ 0.4 $ 4.0 $ 4.4 8% 92% 100% 9% 91% 100% Total MIS $ 477.6 $ 260.8 $ 738.4 $ 495.9 $ 256.4 $ 752.3 65% 35% 100% 66% 34% 100% Moody's Analytics $ 69.2 (1) $ 406.0 $ 475.2 $ 66.9 (1) $ 355.9 $ 422.8 15% 85% 100% 16% 84% 100% Total Moody's Corporation $ 546.8 $ 666.8 $ 1,213.6 $ 562.8 $ 612.3 $ 1,175.1 45% 55% 100% 48% 52% 100% Six Months Ended June 30, 2019 2018 Transaction Relationship Total Transaction Relationship Total Corporate Finance $ 525.9 $ 216.9 $ 742.8 $ 567.9 $ 212.7 $ 780.6 71% 29% 100% 73% 27% 100% Structured Finance $ 125.5 $ 87.3 $ 212.8 $ 159.8 $ 86.2 $ 246.0 59% 41% 100% 65% 35% 100% Financial Institutions $ 109.1 $ 131.9 $ 241.0 $ 106.2 $ 128.7 $ 234.9 45% 55% 100% 45% 55% 100% Public, Project and Infrastructure Finance $ 126.1 $ 75.2 $ 201.3 $ 124.0 $ 77.3 $ 201.3 63% 37% 100% 62% 38% 100% MIS Other $ 0.9 $ 9.7 $ 10.6 $ 1.0 $ 8.4 $ 9.4 8% 92% 100% 11% 89% 100% Total MIS $ 887.5 $ 521.0 $ 1,408.5 $ 958.9 $ 513.3 $ 1,472.2 63% 37% 100% 65% 35% 100% Moody's Analytics $ 140.7 (1) $ 806.5 $ 947.2 $ 127.7 (1) $ 701.9 $ 829.6 15% 85% 100% 15% 85% 100% Total Moody's Corporation $ 1,028.2 $ 1,327.5 $ 2,355.7 $ 1,086.6 $ 1,215.2 $ 2,301.8 44% 56% 100% 47% 53% 100% (1) The following table presents the timing of revenue recognition: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 MIS MA Total MIS MA Total Revenue recognized at a point in time $ 477.6 $ 21.7 $ 499.3 $ 887.5 $ 52.1 $ 939.6 Revenue recognized over time 260.8 453.5 714.3 521.0 895.1 1,416.1 Total $ 738.4 $ 475.2 $ 1,213.6 $ 1,408.5 $ 947.2 $ 2,355.7 Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 MIS MA Total MIS MA Total Revenue recognized at a point in time $ 495.9 $ 14.0 $ 509.9 $ 958.9 $ 29.5 $ 988.4 Revenue recognized over time 256.4 408.8 665.2 513.3 800.1 1,313.4 Total $ 752.3 $ 422.8 $ 1,175.1 $ 1,472.2 $ 829.6 $ 2,301.8 Unbilled receivables, deferred revenue and remaining performance obligations Unbilled receivables At June 30, 2019 and December 31, 2018, accounts receivable included $ 350.9 million and $ 311.8 million, respectively, of unbilled receivables related to the MIS segment. Certain MIS arrangements contain contractual terms whereby the customers are billed in arrears for annual monitoring services, requiring revenue to be accrued as an unbilled receivable as such services are provided. In addition, for certain MA arrangements, the timing of when the Company has the unconditional right to consideration and recognizes revenue occurs prior to invoicing the customer. Consequently, at June 30, 2019 and December 31, 2018, accounts receivable included $ 48.9 million and $ 59.5 million, respectively, of unbilled receivables related to the MA segment. Deferred revenue The Company recognizes deferred revenue when a contract requires a customer to pay consideration to the Company in advance of when revenue related to that contract is recognized. This deferred revenue is relieved when the Company satisfies the related performance obligation and revenue is recognized. Significant changes in the deferred revenue balances during the three and six months ended June 30, 2019 are as follows: Three Months Ended June 30, 2019 MIS MA Total Balance at March 31, 2019 $ 388.3 $ 794.9 $ 1,183.2 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 113.6) ( 340.4) ( 454.0) Increases due to amounts billable excluding amounts recognized as revenue during the period 100.9 246.0 346.9 Amount included in liabilities reclassified as held for sale - ( 2.7) ( 2.7) Effect of exchange rate changes 0.4 ( 3.0) ( 2.6) Total changes in deferred revenue ( 12.3) ( 100.1) ( 112.4) Balance at June 30, 2019 $ 376.0 $ 694.8 $ 1,070.8 Six Months Ended June 30, 2019 MIS MA Total Balance at January 1, 2019 $ 325.4 $ 750.3 $ 1,075.7 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 160.5) ( 533.6) ( 694.1) Increases due to amounts billable excluding amounts recognized as revenue during the period 210.1 479.2 689.3 Amount included in liabilities reclassified as held for sale - ( 2.7) ( 2.7) Effect of exchange rate changes 1.0 1.6 2.6 Total changes in deferred revenue 50.6 ( 55.5) ( 4.9) Balance at June 30, 2019 $ 376.0 $ 694.8 $ 1,070.8 Deferred revenue - current $ 261.7 $ 690.6 $ 952.3 Deferred revenue - noncurrent $ 114.3 $ 4.2 $ 118.5 For the MIS segment, the changes in the deferred revenue balance during the three and six months ended June 30, 2019 were primarily related to the significant portion of contract renewals that occur during the first quarter of 2019 and are generally recognized over a one year period. For the MA segment, the decrease in deferred revenue for the three months ended June 30, 2019 was primarily due to the recognition of annual subscription and maintenance billings from December 2018 and January 2019. For the six months ended June 30, 2019, the decrease in the deferred revenue balance attributable to recognition of revenues related to the aforementioned December 2018 billings, was partially offset by the impact of the high concentration of January 2019 billings. Three Months Ended June 30, 2018 MIS MA Total Balance at March 31, 2018 $ 397.5 $ 729.0 $ 1,126.5 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 127.2) ( 304.8) ( 432.0) Increases due to amounts billable excluding amounts recognized as revenue during the period 112.6 206.9 319.5 Effect of exchange rate changes ( 5.4) ( 22.1) ( 27.5) Total changes in deferred revenue ( 20.0) ( 120.0) ( 140.0) Balance at June 30, 2018 $ 377.5 $ 609.0 $ 986.5 Six Months Ended June 30, 2018 MIS MA Total Balance at January 1, 2018 (after New Revenue Accounting Standard transition adjustment) $ 334.7 $ 611.6 $ 946.3 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 165.4) ( 427.7) ( 593.1) Increases due to amounts billable excluding amounts recognized as revenue during the period 212.6 435.7 648.3 Effect of exchange rate changes ( 4.4) ( 10.6) ( 15.0) Total changes in deferred revenue 42.8 ( 2.6) 40.2 Balance at June 30, 2018 $ 377.5 $ 609.0 $ 986.5 Deferred revenue - current $ 255.9 $ 604.6 $ 860.5 Deferred revenue - noncurrent $ 121.6 $ 4.4 $ 126.0 For the MIS segment, the changes in the deferred revenue balance during the three and six months ended June 30, 2018 were primarily related to the significant portion of contract renewals that occur during the first quarter of 2018 and are generally recognized over a one year period. For the MA segment, the decrease in deferred revenue for the three months ended June 30, 2018 was primarily due to the recognition of annual subscription and maintenance billings in December 2017 and January 2018. For the six months ended June 30, 2018, the impact of the high concentration of January 2018 billings on the deferred revenue balance was mostly offset by the recognition of revenues related to the aforementioned December 2017 billings. Remaining performance obligations The following tables include the expected recognition period for the remaining performance obligations for each reportable segment as of June 30, 2019: MIS Total Less than 1 year 1 - 5 years 6 - 10 Years 11 - 15 years 16-20 years Over 20 Years $ 144.4 $ 23.4 $ 68.2 $ 37.5 $ 6.2 $ 4.0 $ 5.1 The balances in the MIS table above largely reflect deferred revenue related to monitoring fees for certain structured finance products, primarily CMBS, where the issuers can elect to pay the monitoring fees for the life of the security in advance. With respect to the remaining performance obligations for the MIS segment, the Company has applied a practical expedient set forth in ASC Topic 606 permitting the omission from the table above for unsatisfied performance obligations relating to contracts with an original expected length of one year or less. MA Total Less than 1 Year 1 - 2 Years Over 2 Years $ 1,636.0 $ 1,147.1 $ 327.7 $ 161.2 The balances in the MA table above include both amounts recorded as deferred revenue on the balance sheet as of June 30, 2019 as well as amounts not yet invoiced to customers as of June 30, 2019 largely reflecting future revenue related to signed multi-year arrangements for hosted and installed subscription based products.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2019
Stock-Based Compensation [Abstract]
STOCK-BASED COMPENSATION	NOTE 4. STOCK-BASED COMPENSATION Presented below is a summary of the stock-based compensation cost and associated tax benefit included in the accompanying consolidated statements of operations: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Stock-based compensation cost $ 34.2 $ 34.4 $ 69.9 $ 69.5 Tax benefit $ 7.3 $ 7.3 $ 15.1 $ 14.5 During the first six months of 2019, the Company granted 0.2 million employee stock options, which had a weighted average grant date fair value of $ 43.10 per share based on the Black-Scholes option-pricing model. The Company also granted 0.8 million shares of restricted stock in the first six months of 2019, which had a weighted average grant date fair value of $ 173.67 per share. Both the employee stock options and restricted stock generally vest ratably over a four year period. Additionally, the Company granted 0.1 million shares of performance-based awards whereby the number of shares that ultimately vest are based on the achievement of certain non-market based performance metrics of the Company over a three year period. The weighted average grant date fair value of these awards was $ 167.95 per share. The following weighted average assumptions were used in determining the fair value for options granted in 2019: Expected dividend yield 1.15% Expected stock volatility 23.62% Risk-free interest rate 2.60% Expected holding period 6.2 years Unrecognized stock-based compensation expense at June 30, 2019 was$ 9.3 million and $ 208.4 million for stock options and unvested restricted stock, respectively, which is expected to be recognized over a weighted average period of 2.1 years and 2.6 years, respectively. Additionally, there was $ 35.8 million of unrecognized stock-based compensation expense relating to the aforementioned non-market based performance-based awards, which is expected to be recognized over a weighted average period of 2.0 years. The following tables summarize information relating to stock option exercises and restricted stock vesting: Six Months Ended June 30, 2019 2018 Exercise of stock options: Proceeds from stock option exercises $ 23.4 $ 31.9 Aggregate intrinsic value $ 82.8 $ 84.4 Tax benefit realized upon exercise $ 20.2 $ 20.6 Number of shares exercised 0.6 0.7 Vesting of restricted stock: Fair value of shares vested $ 149.8 $ 148.7 Tax benefit realized upon vesting $ 35.5 $ 34.3 Number of shares vested 0.8 0.9 Vesting of performance-based restricted stock: Fair value of shares vested $ 47.5 $ 23.0 Tax benefit realized upon vesting $ 11.5 $ 5.5 Number of shares vested 0.3 0.1

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2019
Income Taxes [Abstract]
INCOME TAXES	NOTE 5. INCOME TAXES Moody’s effective tax rate was 28.0% and 23.7% for the three months ended June 30, 2019 and 2018, respectively and 18.8% and 19.4% for the six months ended June 30, 2019 and 2018, respectively. The increase in the ETR for the three months ended June 30, 2019 was primarily due to a tax charge in the second quarter related to the planned divesture of MAKS. The decrease in ETR for the six months ended June 30, 2019 was primarily due to the issuance of favorable IRS regulations related to the Tax Act. The Company’s interim tax expense differs from the tax computed by applying its estimated annual effective tax rate to this quarter’s pre-tax earnings due to Excess Tax Benefits from stock compensation of $ 10.3 million and net increases to tax positions of $ 2.9 million. The Company classifies interest related to UTPs in interest expense, net in its consolidated statements of operations. Penalties, if incurred, would be recognized in other non-operating (expense) income, net. The Company had an increase in its UTPs of $ 5.0 million ($ 4.8 million, net of federal tax) during the second quarter of 2019 and a net decrease in its UTPs during the first six months of 2019 of $ 15.2 million ($ 15.4 million net of federal tax). Moody’s Corporation and subsidiaries are subject to U.S. federal income tax as well as income tax in various state, local and foreign jurisdictions. The Company’s U.S. federal income tax return for 2017 is currently under audit and 2015 through 2016 remain open to examination. The Company’s New York State tax returns for 2011 through 2014 are currently under examination and the Company’s New York City tax return for 2014 is currently under examination. The Company’s U.K. tax return for 2012 is currently under examination and its returns for 2013 through 2017 remain open to examination. For ongoing audits, it is possible the balance of UTPs could decrease in the next twelve months as a result of the settlement of these audits, which might involve the payment of additional taxes, the adjustment of certain deferred taxes and/or the recognition of tax benefits. It is also possible that new issues might be raised by tax authorities which could necessitate increases to the balance of UTPs. As the Company is unable to predict the timing or outcome of these audits, it is therefore unable to estimate the amount of changes to the balance of UTPs at this time. However, the Company believes that it has adequately provided for its financial exposure relating to all open tax years by tax jurisdiction in accordance with the applicable provisions of Topic 740 of the ASC regarding UTPs. The following table shows the amount the Company paid for income taxes: Six Months Ended June 30, 2019 2018 Income taxes paid $ 198.0 $ 237.3

WEIGHTED AVERAGE SHARES OUTSTAN

WEIGHTED AVERAGE SHARES OUTSTANDING	6 Months Ended
	Jun. 30, 2019
Weighted Average Shares Outstanding [Abstract]
WEIGHTED AVERAGE SHARES OUTSTANDING	NOTE 6. WEIGHTED AVERAGE SHARES OUTSTANDING Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Basic 189.4 191.9 189.9 191.6 Dilutive effect of shares issuable under stock-based compensation plans 1.9 2.5 2.2 2.9 Diluted 191.3 194.4 192.1 194.5 Anti-dilutive options to purchase common shares and restricted stock as well as contingently issuable restricted stock which are excluded from the table above 0.3 0.5 0.3 0.7 The calculation of diluted EPS requires certain assumptions regarding the use of both cash proceeds and assumed proceeds that would be received upon the exercise of stock options and vesting of restricted stock outstanding as of June 30, 2019 and 2018.

CASH EQUIVALENT AND INVESTMENTS

CASH EQUIVALENT AND INVESTMENTS	6 Months Ended
	Jun. 30, 2019
Cash and Cash Equivalents [Abstract]
CASH EQUIVALENT AND INVESTMENT	NOTE 8. CASH EQUIVALENTS AND INVESTMENTS The table below provides additional information on the Company’s cash equivalents and investments: As of June 30, 2019 Balance sheet location Cost Gross Unrealized Gains Fair Value Cash and cash equivalents Short-term investments Other assets Certificates of deposit and money market deposit accounts (1) $ 437.5 $ - $ 437.5 $ 327.4 $ 104.5 $ 5.6 Open ended mutual funds $ 13.5 $ 1.6 $ 15.1 $ - $ 15.0 $ 0.1 As of December 31, 2018 Balance sheet location Cost Gross Unrealized Gains Fair Value Cash and cash equivalents Short-term investments Other assets Money market mutual funds $ 15.2 $ - $ 15.2 $ 15.2 $ - $ - Certificates of deposit and money market deposit accounts (1) $ 1,022.4 $ - $ 1,022.4 $ 904.3 $ 115.8 $ 2.3 Open ended mutual funds $ 29.5 $ 3.8 $ 33.3 $ - $ 16.7 $ 16.6 (1) Consists of time deposits and money market deposit accounts. The remaining contractual maturities for the certificates of deposits classified as short-term investments were one month to 12 months at both June 30, 2019 and December 31, 2018. The remaining contractual maturities for the certificates of deposits classified in other assets are 13 to 24 months at June 30, 2019 and 14 to 36 months at December 31, 2018. Time deposits with a maturity of less than 90 days at time of purchase are classified as cash and cash equivalents.

ACQUISITIONS

ACQUISITIONS	6 Months Ended
	Jun. 30, 2019
Acquisitions [Abstract]
ACQUISITIONS	NOTE 9. ACQUISITIONS AND OTHER STRATEGIC INITIATIVES On April 12, 2019, the Company acquired a majority stake in Vigeo Eiris, a provider of Environmental, Social and Governance (ESG) research, data and assessments. The acquisition furthers Moody’s objective of promoting global standards for ESG for use by market participants. The aggregate purchase price was not material and the near term impact to the Company’s financial statements is not expected to be material. Vigeo Eiris will operate in the MIS reportable segment and its revenue will be reported in the MIS Other LOB. On June 13, 2019, the Company formed a joint venture with Team 8, a cybersecurity think tank and company creation platform, to establish a global standard for evaluating and assessing cyber risk for enterprises. This joint venture is not expected to have a material impact on the Company’s financial statements in 2019. On July 22, 2019, the Company acquired a majority stake in Four Twenty Seven, Inc., a provider of data, intelligence, and analysis related to physical climate risks. The aggregate purchase price was not material and the near term impact to the Company’s financial statements is not expected to be material. Four Twenty Seven Climate Solutions will operate in the MIS reportable segment and its revenue will be reported in the MIS Other LOB. On July 25, 2019, the Company acquired RiskFirst, a FinTech company providing risk analytic solutions for the asset management and pension fund communities. The aggregate purchase price was not material and the near term impact to the Company’s financial statements is not expected to be material. RiskFirst will operate in the MA reportable segment and its revenue will be reported in the ERS LOB.

ASSETS AND LIABILITIES HELD FOR

ASSETS AND LIABILITIES HELD FOR SALE	6 Months Ended
	Jun. 30, 2019
Assets and Liabilities Held For Sale [Abstract]
ASSETS AND LIABILITIES HELD FOR SALE	NOTE 10. ASSETS AND LIABILITIES HELD FOR SALE Following a strategic review of its business portfolio, the Company initiated a plan to sell MAKS and determined that all of the criteria had been met to classify the assets and liabilities of MAKS as held for sale as of June 30, 2019. In accordance with ASC Topic 360, the Company is required to measure the assets and liabilities of MAKS which are classified as held for sale at the lower of carrying value or fair value less any costs to sell. In addition, the Company will be required to reclassify cumulative currency translation losses associated with MAKS to earnings upon the sale of the business. Accordingly, for the purposes of evaluating the impairment of MAKS, the Company has increased the carrying value of MAKS for $ 26.6 million of currency translation losses recorded within AOCI at June 30, 2019. In the second quarter of 2019, the company recorded a non-cash impairment charge of $ 8.7 million to adjust the carrying value of MAKS to fair value. The estimated fair value of $ 204.8 million, which is based on an estimate of the selling price, includes a reduction of approximately $ 42 million for certain indemnification provisions. The fair value of the net assets held for sale is classified as Level 3 within the fair value hierarchy. On July 16, 2019, the Company entered into a definitive agreement to sell MAKS as more fully discussed in Note 23. The following table presents the major classes of the total consolidated assets and liabilities of MAKS that were classified as held for sale on the condensed consolidated balance sheet at June 30, 2019: June 30, 2019 Assets Current assets: Cash and cash equivalents $ 8.0 Accounts receivable, net 20.5 Other current assets 6.1 Total current assets 34.6 Property and equipment, net 12.2 Goodwill 167.4 Intangible assets, net 44.1 Deferred tax assets, net 5.7 Other assets 2.8 Total assets held for sale prior to impairment $ 266.8 Impairment of assets held for sale ( 8.7) Total assets held for sale $ 258.1 Liabilities Current liabilities: Accounts payable and accrued liabilities $ 16.0 Deferred revenue 2.7 Total current liabilities 18.7 Deferred tax liabilities, net 7.4 Uncertain tax positions 29.3 Other liabilities 24.5 Total liabilities held for sale $ 79.9 Derivation of impairment charge Total net assets held for sale prior to impairment $ 186.9 Currency translation adjustment (1) 26.6 Total net assets held for sale including currency translation adjustment $ 213.5 Estimated fair value less costs to sell 204.8 Impairment of assets held for sale $ 8.7 (1)

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	NOTE 11. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The Company is exposed to global market risks, including risks from changes in FX rates and changes in interest rates. Accordingly, the Company uses derivatives in certain instances to manage the aforementioned financial exposures that occur in the normal course of business. The Company does not hold or issue derivatives for speculative purposes. Derivatives and non-derivative instruments designated as accounting hedges: Fair Value Hedges Interest Rate Swaps The Company has entered into interest rate swaps to convert the fixed interest rate on certain of its long-term debt to a floating interest rate based on the 3-month LIBOR. The purpose of these hedges is to mitigate the risk associated with changes in the fair value of the long-term debt, thus the Company has designated these swaps as fair value hedges. The fair value of the swaps is adjusted quarterly with a corresponding adjustment to the carrying value of the debt. The changes in the fair value of the swaps and the underlying hedged item generally offset and the net cash settlements on the swaps are recorded each period within interest expense, net in the Company’s consolidated statement of operations. The following table summarizes the Company’s interest rate swaps designated as fair value hedges: Notional Amount Floating Interest Rate As of As of Hedged Item Nature of Swap June 30, 2019 December 31, 2018 2010 Senior Notes due 2020 Pay Floating/Receive Fixed $ 500.0 $ 500.0 3-month USD LIBOR 2012 Senior Notes due 2022 Pay Floating/Receive Fixed 330.0 330.0 3-month USD LIBOR 2017 Senior Notes due 2021 Pay Floating/Receive Fixed 500.0 500.0 3-month USD LIBOR 2017 Senior Notes due 2023 Pay Floating/Receive Fixed 250.0 - 3-month USD LIBOR Total $ 1,580.0 $ 1,330.0 Refer to Note 18 for information on the cumulative amount of fair value hedging adjustments included in the carrying amount of the above hedged items. The following table summarizes the impact to the statement of operations of the Company’s interest rate swaps designated as fair value hedges: Amount of income/(loss) recognized in the consolidated statements of operations Total amounts of financial statement line item presented in the statements of operations in which the effects of fair value hedges are recorded Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Interest expense, net $ ( 50.6) $ ( 53.4) $ ( 103.1) $ ( 104.1) Descriptions Location on Consolidated Statements of Operations Net interest settlements and accruals on interest rate swaps Interest expense, net $ 0.1 $ ( 0.4) $ ( 0.1) $ ( 0.5) Fair value changes on interest rate swaps Interest expense, net $ 19.8 $ ( 2.3) $ 30.6 $ ( 11.5) Fair value changes on hedged debt Interest expense, net $ ( 19.8) $ 2.3 $ ( 30.6) $ 11.5 Net investment hedges The Company has designated € 500 million of the 2015 Senior Notes Due 2027 as a net investment hedge to mitigate FX exposure related to a portion of the Company’s euro net investment in certain foreign subsidiaries against changes in euro/USD exchange rates. This hedge is designated as an accounting hedge under the applicable sections of ASC Topic 815 and will end upon the repayment of the notes in 2027, unless terminated early at the discretion of the Company. The Company enters into cross-currency swaps to mitigate FX exposure related to a portion of the Company’s euro net investment in certain foreign subsidiaries against changes in euro/USD exchange rates. The following table provides information on the cross-currency swaps designated as net investment hedges under ASC Topic 815: June 30, 2019 Pay Receive Nature of Swap Notional Amount Weighted Average Interest Rate Notional Amount Weighted Average Interest Rate Pay Fixed/Receive Fixed € 1,079.1 1.43% $ 1,220.0 3.96% Pay Floating/Receive Floating 931.3 Based on 3-month EURIBOR 1,080.0 Based on 3-month USD LIBOR Total € 2,010.4 $ 2,300.0 December 31, 2018 Pay Receive Nature of Swap Notional Amount Weighted Average Interest Rate Notional Amount Weighted Average Interest Rate Pay Floating/Receive Floating € 710.2 Based on 3-month EURIBOR $ 830.0 Based on 3-month USD LIBOR Total € 710.2 $ 830.0 As of June 30, 2019, these hedges will expire and be settled in 2021, 2022, 2023, and 2024 for € 687.7 million, € 438.2 million, € 441.9 million and € 442.6 million of the total notional amount, respectively, unless terminated early at the discretion of the Company. The following table provides information on the gains/(losses) on the Company’s net investment and cash flow hedges: Derivative and Non-Derivative Instruments in Net Investment Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing) Three Months Ended Three Months Ended Three Months Ended June 30, June 30, June 30, 2019 2018 2019 2018 2019 (2) 2018 Cross currency swaps $ ( 19.7) $ 4.0 $ - $ - $ 13.5 $ 2.1 Long-term debt ( 9.5) (1) 23.4 - - - - Total net investment hedges $ ( 29.2) $ 27.4 $ - $ - $ 13.5 $ 2.1 Derivatives in Cash Flow Hedging Relationships Cross currency swap $ - $ - $ - $ 0.1 $ - $ - Interest rate contracts - - (0.1) - - - Total cash flow hedges $ - $ - $ ( 0.1) $ 0.1 $ - $ - Total $ ( 29.2) $ 27.4 $ ( 0.1) $ 0.1 $ 13.5 $ 2.1 Derivative and Non-Derivative Instruments in Net Investment Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing) Six Months Ended Six Months Ended Six Months Ended June 30, June 30, June 30, 2019 2018 2019 2018 2019 (2) 2018 Cross currency swaps $ ( 4.5) $ 4.0 $ - $ - $ 21.8 $ 2.1 Long-term debt ( 1.2) (1) 12.5 - - - - Total net investment hedges $ ( 5.7) $ 16.5 $ - $ - $ 21.8 $ 2.1 Derivatives in Cash Flow Hedging Relationships Cross currency swap $ - $ 1.5 $ ( 0.1) $ 0.2 $ - $ - Total cash flow hedges $ - $ 1.5 $ ( 0.1) $ 0.2 $ - $ - Total $ ( 5.7) $ 18.0 $ ( 0.1) $ 0.2 $ 21.8 $ 2.1 (1) Due to the Company's adoption of ASU 2018-02 during the first half of 2019, $ 2.5 million related to the tax effect of this net investment hedge was reclassified to retained earnings. Refer to Note 1 for further details. (2) Effective with the adoption of ASU 2017-12, the Company has elected to assess the effectiveness of its net investment hedges based on changes in spot exchange rates. Accordingly, amounts related to cross-currency swaps recognized directly into Net Income during the first half of 2019 represent net periodic interest settlements and accruals, which are recognized in interest expense, net. The cumulative amount of net investment hedge and cash flow hedge gains (losses) remaining in AOCI is as follows: Cumulative Gains/(Losses), net of tax June 30, 2019 December 31, 2018 Net investment hedges Cross currency swaps $ 7.8 $ 12.3 FX forwards 23.5 23.5 Long-term debt ( 6.8) ( 3.1) Total net investment hedges $ 24.5 $ 32.7 Cash flow hedges Interest rate contracts $ ( 2.4) $ ( 2.4) Cross currency swap 2.6 2.5 Total cash flow hedges 0.2 0.1 Total net gain in AOCI $ 24.7 $ 32.8 Derivatives not designated as accounting hedges: Foreign exchange forwards The Company also enters into foreign exchange forwards to mitigate the change in fair value on certain assets and liabilities denominated in currencies other than a subsidiary’s functional currency. These forward contracts are not designated as accounting hedges under the applicable sections of Topic 815 of the ASC. Accordingly, changes in the fair value of these contracts are recognized immediately in other non-operating (expense) income, net in the Company’s consolidated statements of operations along with the FX gain or loss recognized on the assets and liabilities denominated in a currency other than the subsidiary’s functional currency. These contracts have expiration dates at various times through August 2019. The following table summarizes the notional amounts of the Company’s outstanding foreign exchange forwards: June 30, 2019 December 31, 2018 Notional amount of currency pair: Sell Buy Sell Buy Contracts to sell USD for GBP $ 382.7 £ 299.5 $ 310.3 £ 241.2 Contracts to sell USD for Japanese Yen $ 15.0 ¥ 1,600.0 $ 14.3 ¥ 1,600.0 Contracts to sell USD for Canadian dollars $ 96.8 C$ 130.0 $ 99.0 C$ 130.0 Contracts to sell USD for Singapore dollars $ 35.0 S$ 48.0 $ - S$ - Contracts to sell USD for Euros $ 135.8 € 120.0 $ 212.8 € 184.6 NOTE: € = Euro, £ = British pound, $ = U.S. dollar, ¥ = Japanese Yen, C$ = Canadian dollar, S$= Singapore dollars The following table summarizes the impact to the consolidated statements of operations relating to the net losses on the Company’s derivatives which are not designated as hedging instruments: Three Months Ended Six Months Ended Derivatives not designated as accounting hedges June 30, June 30, Location on Statement of Operations 2019 2018 2019 2018 Foreign exchange forwards Other non-operating expense, net $ ( 9.9) $ ( 44.9) $ ( 8.5) $ ( 17.3) The table below shows the classification between assets and liabilities on the Company’s consolidated balance sheets for the fair value of the derivative instrument as well as the carrying value of its non-derivative debt instruments designated and qualifying as net investment hedges: Derivative and Non-Derivative Instruments Balance Sheet Location June 30, 2019 December 31, 2018 Assets: Derivatives designated as accounting hedges: Cross-currency swaps designated as net investment hedges Other assets $ 21.3 $ 19.4 Interest rate swaps designated as fair value hedges Other assets 32.8 7.5 Total derivatives designated as accounting hedges 54.1 26.9 Derivatives not designated as accounting hedges: FX forwards on certain assets and liabilities Other current assets 5.0 1.4 Total assets $ 59.1 $ 28.3 Liabilities: Derivatives designated as accounting hedges: Cross-currency swaps designated as net investment hedges Other liabilities $ 10.9 $ 2.9 Interest rate swaps designated as fair value hedges Other liabilities - 5.3 Total derivatives designated as accounting hedges 10.9 8.2 Non-derivatives designated as accounting hedges: Long-term debt designated as net investment hedge Long-term debt 569.4 571.6 Derivatives not designated as accounting hedges: FX forwards on certain assets and liabilities Accounts payable and accrued liabilities 1.6 8.2 Total liabilities $ 581.9 $ 588.0

GOODWILL AND OTHER ACQUIRED INT

GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS	6 Months Ended
	Jun. 30, 2019
Goodwill And Other Acquired Intangible Assets [Abstract]
GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS	NOTE 12. GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS The following table summarizes the activity in goodwill for the periods indicated: Six Months Ended June 30, 2019 MIS MA Consolidated Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Balance at beginning of year $ 257.8 $ - $ 257.8 $ 3,535.7 $ ( 12.2) $ 3,523.5 $ 3,793.5 $ ( 12.2) $ 3,781.3 Additions/ adjustments (1) 43.6 - 43.6 - - - 43.6 - 43.6 Foreign currency translation adjustments 11.3 - 11.3 ( 3.9) - ( 3.9) 7.4 - 7.4 Reclassification to assets held for sale (See Note 10) (2) - - - ( 167.4) - ( 167.4) ( 167.4) - ( 167.4) Ending balance $ 312.7 $ - $ 312.7 $ 3,364.4 $ ( 12.2) $ 3,352.2 $ 3,677.1 $ ( 12.2) $ 3,664.9 Year Ended December 31, 2018 MIS MA Consolidated Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Balance at beginning of year $ 285.2 $ - $ 285.2 $ 3,480.2 $ ( 12.2) $ 3,468.0 $ 3,765.4 $ ( 12.2) $ 3,753.2 Additions/ adjustments (3) - - - 211.5 - 211.5 211.5 - 211.5 Foreign currency translation adjustments ( 27.4) - ( 27.4) ( 156.0) - ( 156.0) ( 183.4) - ( 183.4) Ending balance $ 257.8 $ - $ 257.8 $ 3,535.7 $ ( 12.2) $ 3,523.5 $ 3,793.5 $ ( 12.2) $ 3,781.3 (1) (2) (3) Acquired intangible assets and related amortization consisted of: June 30, December 31, 2019 2018 Customer relationships $ 1,284.3 $ 1,367.5 Accumulated amortization ( 206.0) ( 214.2) Net customer relationships 1,078.3 1,153.3 Trade secrets 30.0 29.8 Accumulated amortization ( 28.5) ( 28.2) Net trade secrets 1.5 1.6 Software/product technology 353.2 353.3 Accumulated amortization ( 115.0) ( 101.8) Net software/product technology 238.2 251.5 Trade names 146.0 155.1 Accumulated amortization ( 26.8) ( 34.1) Net trade names 119.2 121.0 Other (1) 78.5 70.4 Accumulated amortization ( 29.7) ( 31.7) Net other 48.8 38.7 Total acquired intangible assets, net $ 1,486.0 $ 1,566.1 (1) Amortization expense relating to acquired intangible assets is as follows: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Amortization expense $ 26.2 $ 25.1 $ 52.6 $ 50.8 Estimated future amortization expense for acquired intangible assets subject to amortization is as follows: Year Ending December 31, 2019 (after June 30) $ 48.5 2020 95.9 2021 95.7 2022 95.7 2023 92.6 Thereafter 1,057.6 Total estimated future amortization $ 1,486.0 ICRA has reported that it is addressing certain matters related to (i) credit ratings assigned to one of its customers and the customer’s subsidiaries, regarding which adjudication proceedings have been initiated by the Securities and Exchange Board of India (SEBI), (ii) anonymous allegations that were forwarded to ICRA by SEBI, and (iii) a request from SEBI for ICRA’s comments on observations made in an interim report prepared by Grant Thornton India LLP. In July 2019, the board of directors of ICRA placed its CEO on leave until further notice. As of the date of this quarterly filing on Form 10-Q, the Company is unable to estimate the financial impact, if any, that may result from a potential unfavorable conclusion of these matters or any related inquiry. An unfavorable resolution of such matters may negatively impact ICRA’s future operating results, which could result in an impairment of goodwill and amortizable intangible assets in future quarters.

RESTRUCTURING

RESTRUCTURING	6 Months Ended
	Jun. 30, 2019
Restructuring [Abstract]
RESTRUCTURING	NOTE 13. RESTRUCTURING On October 26, 2018, the chief executive officer of Moody’s approved a restructuring program (the “2018 Restructuring Program”) that the Company currently estimates will result in annualized savings of approximately $ 60 million per year, a portion of which will benefit 2019. The 2018 Restructuring Program, the scope of which was expanded in the second quarter of 2019, is now estimated to result in total pre-tax charges of $ 105 to $ 110 million. The 2018 Restructuring Program includes relocation of certain functions from high-cost to lower-cost jurisdictions, a reduction of staff, including from recent acquisitions and pursuant to a review of the business criticality of certain positions, and the rationalization and exit of certain real estate leases due to consolidation of various business activities. The exit from certain leased office space began in the fourth quarter of 2018 and will entail approximately $ 50 million of the charges to either terminate or sublease the affected real estate leases. The 2018 Restructuring Program is also anticipated to represent approximately $ 60 million of personnel-related restructuring charges, an amount that includes severance and related costs primarily determined under the Company’s existing severance plans. Cash outlays associated with the employee termination cost component of the 2018 Restructuring Program are anticipated to be approximately $ 60 million, which will be paid through 2021. Total expenses included in the accompanying consolidated statements of operations relating to the 2018 Restructuring Program are as follows: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Restructuring $ 53.8 $ - $ 59.3 $ - Changes to the restructuring liability during the first half of 2019 were as follows: Employee Termination Costs Contract Termination Costs Total Restructuring Liability (2) Balance as of December 31, 2018 $ 29.9 $ 12.4 $ 42.3 2018 Restructuring Program: Adoption of New Lease Accounting Standard (1) - ( 10.9) ( 10.9) Cost incurred and adjustments 26.1 4.3 30.4 Cash payments and adjustments ( 19.1) ( 2.6) ( 21.7) Balance as of June 30, 2019 $ 36.9 $ 3.2 $ 40.1 2018 Restructuring Program: Cumulative expense incurred to date $ 59.0 $ 49.0 (1) Upon the adoption of the New Lease Accounting Standard, the Company recorded a reclassification of $ 10.9 million of liabilities in the first quarter of 2019 for costs associated with certain real estate leases which were exited in previous years, as a reduction of the ROU Asset capitalized upon adoption. (2) The liability excludes $ 4.1 million of non-cash acceleration of amortization of leasehold improvements relating to the rationalization and exit of certain real estate leases as well as $ 24.8 million of ROU Asset impairment charges for the six months ended June 30, 2019. The fair value of the impaired ROU Assets was determined by utilizing the present value of the estimated future cash flows attributable to the assets. The fair value of those ROU assets subsequent to the impairment was $ 17.7 million, and is categorized as Level 3 within the ASC Topic 820 fair value hierarchy. As of June 30, 2019, the remaining $ 40.1 million restructuring liability is expected to be paid out through 2021.

FAIR VALUE

FAIR VALUE	6 Months Ended
	Jun. 30, 2019
Fair Value [Abstract]
FAIR VALUE	NOTE 14. FAIR VALUE The table below presents information about items that are carried at fair value at June 30, 2019 and December 31, 2018: Fair Value Measurement as of June 30, 2019 Description Balance Level 1 Level 2 Assets: Derivatives (1) $ 59.1 $ - $ 59.1 Mutual funds 15.1 15.1 - Total $ 74.2 $ 15.1 $ 59.1 Liabilities: Derivatives (1) $ 12.5 $ - $ 12.5 Total $ 12.5 $ - $ 12.5 Fair Value Measurement as of December 31, 2018 Description Balance Level 1 Level 2 Assets: Derivatives (1) $ 28.3 $ - $ 28.3 Money market mutual funds 15.2 15.2 - Mutual funds 33.3 33.3 - Total $ 76.8 $ 48.5 $ 28.3 Liabilities: Derivatives (1) $ 16.4 $ - $ 16.4 Total $ 16.4 $ - $ 16.4 (1) The following are descriptions of the methodologies utilized by the Company to estimate the fair value of its derivative contracts, mutual funds and money market mutual funds: Derivatives: In determining the fair value of the derivative contracts in the table above, the Company utilizes industry standard valuation models. Where applicable, these models project future cash flows and discount the future amounts to a present value using spot rates, forward points, currency volatilities, interest rates as well as the risk of non-performance of the Company and the counterparties with whom it has derivative contracts. The Company established strict counterparty credit guidelines and only enters into transactions with financial institutions that adhere to these guidelines. Accordingly, the risk of counterparty default is deemed to be minimal. Mutual funds and money market mutual funds: The mutual funds in the table above are deemed to be equity securities with readily determinable fair values with changes in the fair value recognized through net income under ASC Topic 321. The fair value of these instruments is determined using Level 1 inputs as defined in the ASC Topic 820.

OTHER BALANCE SHEET AND STATEME

OTHER BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION	6 Months Ended
	Jun. 30, 2019
Other Balance Sheet And Statement Of Operations Information [Abstract]
OTHER BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION	NOTE 15. OTHER BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION The following tables contain additional detail related to certain balance sheet captions June 30, 2019 December 31, 2018 Other current assets: Prepaid taxes $ 147.7 $ 100.1 Prepaid expenses 86.2 102.0 Capitalized costs to obtain and fulfill sales contracts 73.4 77.2 Other 28.5 3.0 Total other current assets $ 335.8 $ 282.3 Other assets: Investments in non-consolidated affiliates $ 121.4 $ 104.6 Deposits for real-estate leases 14.6 13.5 Indemnification assets related to acquisitions 16.2 16.1 Mutual funds and fixed deposits 5.7 18.9 Costs to obtain sales contracts 89.1 78.0 Cross currency and interest rate swaps 54.1 26.9 Other 16.4 16.3 Total other assets $ 317.5 $ 274.3 June 30, 2019 December 31, 2018 Accounts payable and accrued liabilities: Salaries and benefits $ 101.9 $ 112.5 Incentive compensation 95.9 154.5 Customer credits, advanced payments and advanced billings 21.3 20.4 Self-insurance reserves 11.4 10.6 Dividends 5.0 6.5 Professional service fees 57.9 47.7 Interest accrued on debt 66.2 70.5 Accounts payable 4.9 30.1 Income taxes 75.1 71.4 Pension and other retirement employee benefits 6.5 6.4 Accrued royalties 13.3 25.1 Foreign exchange forwards on certain assets and liabilities 1.6 8.2 Restructuring liability 34.3 35.5 Other 93.4 95.8 Total accounts payable and accrued liabilities $ 588.7 $ 695.2 Other liabilities: Pension and other retirement employee benefits $ 265.9 $ 249.2 Deferred rent - non-current portion (1) - 94.3 Interest accrued on UTPs 69.8 69.6 Income tax liability - non-current portion (2) 125.3 125.3 Cross currency and interest rate swaps 10.9 8.2 Restructuring liability 5.8 6.8 Other 13.8 23.1 Total other liabilities $ 491.5 $ 576.5 (1) (2) Other Non-Operating Income (Expense): The following table summarizes the components of other non-operating income (expense): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 FX (loss)/gain $ ( 9.4) $ 6.2 $ ( 15.6) $ 0.3 Net periodic pension costs - other components 4.4 2.9 8.9 5.2 Income from investments in non-consolidated affiliates 5.6 4.6 6.8 5.9 Other ( 0.2) 1.2 2.6 4.5 Total $ 0.4 $ 14.9 $ 2.7 $ 15.9

COMPREHENSIVE INCOME AND ACCUMU

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME	6 Months Ended
	Jun. 30, 2019
Comprehensive Income And Accumulated Other Comprehensive Income [Abstract]
COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME	NOTE 16. COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME The following table provides details about the reclassifications out of AOCI: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Affected line in the consolidated statement of operations Losses on cash flow hedges Cross-currency swap - ( 0.1) Other non-operating income (expense), net Interest rate contract ( 0.1) - Interest expense, net Total before income taxes ( 0.1) ( 0.1) Income tax effect of items above - - Provision for income taxes Total net losses on cash flow hedges ( 0.1) ( 0.1) Pension and other retirement benefits Amortization of actuarial losses and prior service costs included in net income ( 0.5) ( 1.0) Operating expense Amortization of actuarial losses and prior service costs included in net income ( 0.3) ( 0.6) SG&A expense Total before income taxes ( 0.8) ( 1.6) Income tax effect of item above 0.2 0.4 Provision for income taxes Total pension and other retirement benefits ( 0.6) ( 1.2) Total net losses included in Net Income attributable to reclassifications out of AOCI $ ( 0.7) $ ( 1.3) Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Affected line in the consolidated statement of operations Gains on cash flow hedges Cross-currency swap $ 0.1 $ 0.2 Other non-operating income (expense), net Income tax effect of item above - - Provision for income taxes Total net gains on cash flow hedges 0.1 0.2 Pension and other retirement benefits Amortization of actuarial losses and prior service costs included in net income ( 0.7) ( 1.6) Operating expense Amortization of actuarial losses and prior service costs included in net income ( 0.3) ( 0.8) SG&A expense Total before income taxes ( 1.0) ( 2.4) Income tax effect of item above 0.3 0.7 Provision for income taxes Total pension and other retirement benefits ( 0.7) ( 1.7) Total net losses included in Net Income attributable to reclassifications out of AOCI $ ( 0.6) $ ( 1.5) The following table shows changes in AOCI by component (net of tax): Three Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance March 31, $ ( 69.0) $ 0.1 $ ( 440.3) $ 53.7 $ ( 455.5) $ ( 60.5) $ 2.3 $ 18.5 $ ( 12.2) $ - $ ( 51.9) Other comprehensive income/(loss) before reclassifications ( 2.1) - 40.0 ( 29.2) 8.7 1.2 - ( 282.1) 27.4 - ( 253.5) Amounts reclassified from AOCI 0.6 0.1 - - 0.7 0.7 ( 0.1) - - - 0.6 Other comprehensive income/(loss) ( 1.5) 0.1 40.0 ( 29.2) 9.4 1.9 ( 0.1) ( 282.1) 27.4 - ( 252.9) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8) Six Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance December 31, $ ( 53.1) $ 0.1 $ ( 406.0) $ 32.7 $ ( 426.3) $ ( 61.5) $ 0.9 $ ( 112.6) $ ( 1.3) $ 2.3 $ ( 172.2) Adoption of ASU 2016-01 relating to financial instruments - - - - - - - - - ( 2.3) ( 2.3) Other comprehensive income/(loss) before reclassifications ( 1.3) - 5.7 ( 5.7) ( 1.3) 1.2 1.5 ( 151.0) 16.5 - ( 131.8) Amounts reclassified from AOCI 1.2 0.1 - - 1.3 1.7 ( 0.2) - - - 1.5 Adoption of ASU 2018-02 (See Note 1) ( 17.3) - - ( 2.5) ( 19.8) - - - - - - Other comprehensive income/(loss) ( 17.4) 0.1 5.7 ( 8.2) ( 19.8) 2.9 1.3 ( 151.0) 16.5 ( 2.3) ( 132.6) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8)

PENSION AND OTHER POST-RETIREME

PENSION AND OTHER POST-RETIREMENT BENEFITS	6 Months Ended
	Jun. 30, 2019
Pension And Other Retirement Benefits [Abstract]
PENSION AND OTHER RETIREMENT BENEFITS	NOTE 17. PENSION AND OTHER RETIREMENT BENEFITS Moody’s maintains funded and unfunded noncontributory DBPPs. The U.S. plans provide defined benefits using a cash balance formula based on years of service and career average salary for its employees or final average pay for selected executives. The Company also provides certain healthcare and life insurance benefits for retired U.S. employees. The retirement healthcare plans are contributory; the life insurance plans are noncontributory. Moody’s funded and unfunded U.S. pension plans, the U.S. retirement healthcare plans and the U.S. retirement life insurance plans are collectively referred to herein as the “Retirement Plans”. The U.S. retirement healthcare plans and the U.S. retirement life insurance plans are collectively referred to herein as the “Other Retirement Plans”. The non-U.S. defined benefit pension plan are immaterial. Effective January 1, 2008, the Company no longer offers DBPPs to U.S. employees hired or rehired on or after January 1, 2008. New U.S. employees will instead receive a retirement contribution of similar benefit value under the Company’s Profit Participation Plan. Current participants of the Company’s DBPPs continue to accrue benefits based on existing plan formulas. The components of net periodic benefit expense related to the Retirement Plans are as follows: Three Months Ended June 30, Pension Plans Other Retirement Plans 2019 2018 2019 2018 Components of net periodic expense Service cost $ 4.0 $ 4.6 $ 0.7 $ 0.8 Interest cost 5.2 4.4 0.3 0.2 Expected return on plan assets ( 5.1) ( 3.8) - - Amortization of net actuarial loss from earlier periods 1.0 1.5 - - Amortization of net prior service costs from earlier periods ( 0.1) ( 0.1) - - Net periodic expense $ 5.0 $ 6.6 $ 1.0 $ 1.0 Six Months Ended June 30, Pension Plans Other Retirement Plans 2019 2018 2019 2018 Components of net periodic expense Service cost $ 8.3 $ 9.4 $ 1.4 $ 1.5 Interest cost 10.3 8.8 0.6 0.5 Expected return on plan assets ( 10.1) ( 7.6) - - Amortization of net actuarial loss from earlier periods 1.9 3.1 - - Amortization of net prior service costs from earlier periods ( 0.2) ( 0.2) ( 0.1) ( 0.1) Net periodic expense $ 10.2 $ 13.5 $ 1.9 $ 1.9 The Company made payments of $ 3.0 million related to its unfunded U.S. DBPPs and $ 0.1 million to its U.S. other retirement plans during the six months ended June 30, 2019. Additionally, the Company anticipates making payments of $ 3.6 million and $ 1.0 million to its unfunded U.S. DBPPs and U.S. other retirement plans, respectively, during the remainder of 2019.

INDEBTEDNESS

INDEBTEDNESS	6 Months Ended
	Jun. 30, 2019
Indebtedness [Abstract]
INDEBTEDNESS	NOTE 18. INDEBTEDNESS The Company’s debt is recorded at its carrying amount, which represents the issuance amount plus or minus any issuance premium or discount, except for the 2010 Senior Notes, the 2012 Senior Notes, the 2017 Senior Notes due 2021 and the 2017 Senior Notes due 2023, which are recorded at the carrying amount adjusted for the fair value of an interest rate swap used to hedge the fair value of the note. The following table summarizes total indebtedness: June 30, 2019 Principal Amount Fair Value of Interest Rate Swaps (1) Unamortized (Discount) Premium Unamortized Debt Issuance Costs Carrying Value Notes Payable: 5.50% 2010 Senior Notes, due 2020 $ 500.0 $ 2.3 $ ( 0.5) $ ( 0.5) $ 501.3 4.50% 2012 Senior Notes, due 2022 500.0 10.1 ( 1.4) ( 1.2) 507.5 4.875% 2013 Senior Notes, due 2024 500.0 - ( 1.4) ( 1.8) 496.8 5.25% 2014 Senior Notes (30-Year), due 2044 600.0 - 3.2 ( 5.4) 597.8 1.75% 2015 Senior Notes, due 2027 569.4 - - ( 2.9) 566.5 2.75% 2017 Senior Notes, due 2021 500.0 13.1 ( 0.8) ( 2.0) 510.3 2.625% 2017 Senior Notes, due 2023 500.0 7.3 ( 0.8) ( 2.6) 503.9 3.25% 2017 Senior Notes, due 2028 500.0 - ( 4.5) ( 3.5) 492.0 3.25% 2018 Senior Notes, due 2021 300.0 - ( 0.3) ( 1.2) 298.5 4.25% 2018 Senior Notes, due 2029 400.0 - ( 2.9) ( 3.1) 394.0 4.875% 2018 Senior Notes, due 2048 400.0 - ( 6.6) ( 4.0) 389.4 Commercial Paper 130.0 - ( 0.1) - 129.9 Total debt $ 5,399.4 $ 32.8 $ ( 16.1) $ ( 28.2) $ 5,387.9 Current portion ( 129.9) Total long-term debt $ 5,258.0 December 31, 2018 Principal Amount Fair Value of Interest Rate Swaps (1) Unamortized (Discount) Premium Unamortized Debt Issuance Costs Carrying Value Notes Payable: 5.50% 2010 Senior Notes, due 2020 $ 500.0 $ ( 3.7) $ ( 0.6) $ ( 0.7) $ 495.0 4.50% 2012 Senior Notes, due 2022 500.0 1.9 ( 1.6) ( 1.4) 498.9 4.875% 2013 Senior Notes, due 2024 500.0 - ( 1.5) ( 2.0) 496.5 2.75% 2014 Senior Notes (5-Year), due 2019 450.0 - ( 0.1) - 449.9 5.25% 2014 Senior Notes (30-Year), due 2044 600.0 - 3.2 ( 5.5) 597.7 1.75% 2015 Senior Notes, due 2027 571.6 - - ( 3.1) 568.5 2.75% 2017 Senior Notes, due 2021 500.0 4.0 ( 1.0) ( 2.4) 500.6 2.625% 2017 Senior Notes, due 2023 500.0 - ( 0.9) ( 2.8) 496.3 3.25% 2017 Senior Notes, due 2028 500.0 - ( 4.7) ( 3.7) 491.6 3.25% 2018 Senior Notes, due 2021 300.0 - ( 0.4) ( 1.5) 298.1 4.25% 2018 Senior Notes, due 2029 400.0 - ( 3.0) ( 3.3) 393.7 4.875% 2018 Senior Notes, due 2048 400.0 - ( 6.7) ( 4.1) 389.2 Total debt $ 5,721.6 $ 2.2 $ ( 17.3) $ ( 30.5) $ 5,676.0 Current portion ( 449.9) Total long-term debt $ 5,226.1 (1) Commercial Paper As of June 30, 2019, the Company has CP borrowings outstanding of $ 129.9 million with a weighted average maturity date at the time of issuance of 21 days. At June 30, 2019, the weighted average remaining maturity and interest rate on CP outstanding was 12 days and 2.65% respectively. At June 30, 2019, the Company was in compliance with all covenants contained within all of the debt agreements. All the debt agreements contain cross default provisions which state that default under one of the aforementioned debt instruments could in turn permit lenders under other debt instruments to declare borrowings outstanding under those instruments to be immediately due and payable. As of June 30, 2019, there were no such cross defaults. Notes Payable On January 3, 2019, the Company fully repaid $ 450 million of the 2014 Senior Notes (5-year). The repayment schedule for the Company’s borrowings is as follows: Year Ending December 31, 2010 Senior Notes due 2020 2012 Senior Notes due 2022 2013 Senior Notes due 2024 2014 Senior Notes (30-year) due 2044 2015 Senior Notes due 2027 2017 Senior Notes due 2021 2017 Senior Notes due 2023 2017 Senior Notes due 2028 2018 Senior Notes due 2021 2018 Senior Notes due 2029 2018 Senior Notes due 2048 Commercial Paper Total 2019 (After June 30) $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ 130.0 $ 130.0 2020 500.0 - - - - - - - - - - - 500.0 2021 - - - - - 500.0 - - 300.0 - - - 800.0 2022 - 500.0 - - - - - - - - - - 500.0 2023 - - - - - - 500.0 - - - - - 500.0 Thereafter - - 500.0 600.0 569.4 - - 500.0 - 400.0 400.0 - 2,969.4 Total $ 500.0 $ 500.0 $ 500.0 $ 600.0 $ 569.4 $ 500.0 $ 500.0 $ 500.0 $ 300.0 $ 400.0 $ 400.0 $ 130.0 $ 5,399.4 Interest expense, net The following table summarizes the components of interest as presented in the consolidated statements of operations: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Income $ 3.9 $ 3.4 $ 8.9 $ 6.6 Expense on borrowings ( 41.7) ( 49.4) ( 88.3) ( 100.7) UTPs and other tax related liabilities ( 7.6) ( 2.8) ( 13.2) ( 1.0) Net periodic pension costs - interest component ( 5.6) ( 4.9) ( 11.2) ( 9.6) Capitalized 0.4 0.3 0.7 0.6 Total $ ( 50.6) $ ( 53.4) $ ( 103.1) $ ( 104.1) The following table shows the cash paid for interest: Six Months Ended June 30, 2019 2018 Interest paid $ 97.7 $ 102.5 The fair value and carrying value of the Company’s debt (excluding Commercial Paper) as of June 30, 2019 and December 31, 2018 are as follows: June 30, 2019 December 31, 2018 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value 5.50% 2010 Senior Notes, due 2020 $ 501.3 $ 517.8 $ 495.0 $ 517.7 4.50%2012 Senior Notes, due 2022 507.5 529.4 498.9 513.7 4.875% 2013 Senior Notes, due 2024 496.8 547.4 496.5 522.4 2.75% 2014 Senior Notes (5-Year), due 2019 - - 449.9 449.9 5.25% 2014 Senior Notes (30-Year), due 2044 597.8 713.4 597.7 638.1 1.75% 2015 Senior Notes, due 2027 566.5 615.7 568.5 585.3 2.75% 2017 Senior Notes, due 2021 510.3 504.5 500.6 489.7 2.625% 2017 Senior Notes, due 2023 503.9 501.2 496.3 476.9 3.25% 2017 Senior Notes, due 2028 492.0 506.3 491.6 472.8 3.25% 2018 Senior Notes, due 2021 298.5 305.0 298.1 298.6 4.25% 2018 Senior Notes, due 2029 394.0 436.4 393.7 407.6 4.875% 2018 Senior Notes, due 2048 389.4 461.0 389.2 409.8 Total $ 5,258.0 $ 5,638.1 $ 5,676.0 $ 5,782.5 The fair value of the Company’s long-term debt is estimated based on quoted market prices for similar instruments. Accordingly, the inputs used to estimate the fair value of the Company’s long-term debt are classified as Level 2 inputs within the fair value hierarchy.

LEASES

LEASES	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
LEASES	NOTE 19. LEASES The Company has operating leases, substantially all of which relate to the lease of office space. The Company’s leases which are classified as finance leases are not material to the condensed consolidated financial statements. Certain of the Company’s leases include options to renew, with renewal terms that can extend the lease term from one to 20 years at the Company’s discretion. The following table presents the components of the Company’s lease cost: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 24.5 $ 49.1 Short-term lease cost - 0.4 Variable lease cost 4.1 7.7 Total lease cost $ 28.6 $ 57.2 During the second quarter of 2019, the Company recorded $ 24.8 million of ROU Asset impairment charges related to the exit of certain real estate leases. The impairment charges were recording within Restructuring expense on the condensed consolidated statement of operations. Refer to Note 13 for further details. The following tables present other information related to the Company’s operating leases: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Cash paid for amounts included in the measurement of operating lease liabilities $ 27.0 $ 53.2 Right-of-use assets obtained in exchange for new operating lease liabilities $ 6.9 $ 15.9 June 30, 2019 Weighted-average remaining lease term 7.3 years Weighted-average discount rate applied to operating leases 3.6% The following table presents a maturity analysis of the future minimum lease payments included within the Company’s operating lease liabilities at June 30, 2019: Year Ending December 31, Operating Leases 2019 (After June 30) $ 54.8 2020 106.9 2021 100.5 2022 87.2 2023 81.7 After 2023 248.1 Total lease payments (undiscounted) 679.2 Less: Interest 79.9 Present value of lease liabilities: $ 599.3 Lease liabilities - current $ 89.1 Lease liabilities - noncurrent $ 510.2

CONTINGENCIES

CONTINGENCIES	6 Months Ended
	Jun. 30, 2019
Contingencies [Abstract]
CONTINGENCIES	NOTE 20. CONTINGENCIES Given the nature of their activities, Moody’s and its subsidiaries are subject to legal and tax proceedings, governmental, regulatory and legislative investigations, subpoenas and other inquiries, and claims and litigation by governmental and private parties that are based on ratings assigned by MIS or that are otherwise incidental to the Company’s business. Moody’s and MIS also are subject to periodic reviews, inspections, examinations and investigations by regulators in the U.S. and other jurisdictions, any of which may result in claims, legal proceedings, assessments, fines, penalties or restrictions on business activities. Moody’s also is subject to ongoing tax audits as addressed in Note 5 to the financial statements. In May 2013, the Company and five subsidiaries (collectively, the “Company Defendants”) were served with a qui tam complaint filed by a former employee (“Plaintiff”) in New York Supreme Court (the “Court”) on behalf of New York State (the “State”) and New York City (the “City”) asserting purported claims under the New York False Claims Act (“NYFCA”). Both the State and the City were given an opportunity to intervene as plaintiffs in the action but declined to do so. In August 2013, Plaintiff filed an Amended Complaint adding Marsh & McLennan Companies, Inc. as a defendant. Plaintiff’s central allegation against the Company Defendants is that their treatment of the Company’s wholly-owned captive insurance subsidiary, Moody’s Assurance Company, Inc. (“MAC”), in their State and City tax filings between 2002 and 2014 was contrary to the State and City tax codes. Plaintiff also asserts a cause of action for retaliation under the NYFCA and alleges that his employment was improperly terminated after he reported his concerns regarding MAC’s tax treatment internally. Plaintiff alleges that the Company underpaid State and City taxes by more than $ 120 million (which the Company believes is unsupported as a matter of fact and law), and requests statutory damages of triple that amount, as well as unspecified damages related to the retaliation claim. In December 2016, the Court issued a decision largely denying the Company Defendants’ motion to dismiss. The Company Defendants appealed, and in August 2018, the Appellate Division of the New York Supreme Court upheld the Court’s decision. Discovery is ongoing and, absent earlier disposition, the Company expects the case to go to trial no earlier than 2020. The Company is unable to estimate a range of loss, and is contesting Plaintiff’s claims, which it believes are meritless. Management periodically assesses the Company’s liabilities and contingencies in connection with these matters based upon the latest information available. For claims, litigation and proceedings and governmental investigations and inquiries not related to income taxes, the Company records liabilities in the consolidated financial statements when it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated and periodically adjusts these as appropriate. When the reasonable estimate of the loss is within a range of amounts, the minimum amount of the range is accrued unless some higher amount within the range is a better estimate than another amount within the range. In instances when a loss is reasonably possible but uncertainties exist related to the probable outcome and/or the amount or range of loss, management does not record a liability but discloses the contingency if material. As additional information becomes available, the Company adjusts its assessments and estimates of such matters accordingly. Moody’s also discloses material pending legal proceedings pursuant to SEC rules and other pending matters as it may determine to be appropriate. In view of the inherent difficulty of assessing the potential outcome of legal proceedings, governmental, regulatory and legislative investigations and inquiries, claims and litigation and similar matters and contingencies, particularly when the claimants seek large or indeterminate damages or assert novel legal theories or the matters involve a large number of parties, the Company often cannot predict what the eventual outcome of the pending matters will be or the timing of any resolution of such matters. The Company also may be unable to predict the impact (if any) that any such matters may have on how its business is conducted, on its competitive position or on its financial position, results of operations or cash flows. As the process to resolve any pending matters progresses, management will continue to review the latest information available and assess its ability to predict the outcome of such matters and the effects, if any, on its operations and financial condition and to accrue for and disclose such matters as and when required. However, because such matters are inherently unpredictable and unfavorable developments or resolutions can occur, the ultimate outcome of such matters, including the amount of any loss, may differ from those estimates.

SEGMENT INFORMATION

SEGMENT INFORMATION	6 Months Ended
	Jun. 30, 2019
Segment Information [Abstract]
SEGMENT INFORMATION	NOTE 21. SEGMENT INFORMATION The Company is organized into two The MIS segment consists of five LOBs. The CFG, SFG, FIG and PPIF LOBs generate revenue principally from fees for the assignment and ongoing monitoring of credit ratings on debt obligations and the entities that issue such obligations in markets worldwide. The MIS Other LOB primarily consists of financial instruments pricing services in the Asia-Pacific region as well as ICRA non-ratings revenue. The MA segment develops a wide range of products and services that support the risk management activities of institutional participants in global financial markets. The MA segment consists of three LOBs - RD&A, ERS and PS. Revenue for MIS and expenses for MA include an intersegment royalty charged to MA for the rights to use and distribute content, data and products developed by MIS. The royalty rate charged by MIS approximates the fair value of the aforementioned content, data and products and is generally based on comparable market transactions. Also, revenue for MA and expenses for MIS include an intersegment fee charged to MIS from MA for certain MA products and services utilized in MIS’s ratings process. These fees charged by MA are generally equal to the costs incurred by MA to produce these products and services. Overhead expenses include costs such as rent and occupancy, information technology and support staff such as finance, human resources and legal. Such costs and corporate expenses that exclusively benefit one segment are fully charged to that segment. For overhead and corporate expenses that benefit both segments, in years prior to 2019, the Company generally allocated costs ratably based on each segment’s share of total revenue. Beginning in 2019, the Company refined its methodology such that costs allocated to each segment based on the segment’s share of 2018 actual revenue comprise a “Baseline Pool” that will remain fixed over time. In subsequent periods, incremental overhead costs (or reductions thereof) will be allocated to each segment based on the prevailing shares of total revenue represented by each segment. The Company believes that this allocation method will better align the amount of overhead costs consumed by each segment and contribute stability to each segment’s costs over time. The impact of this refined methodology would not have resulted in a material change to previously reported segment results. “Eliminations” in the following table represent intersegment revenue/expense. Moody’s does not report the Company’s assets by reportable segment, as this metric is not used by the chief operating decision maker to allocate resources to the segments. Consequently, it is not practical to show assets by reportable segment. Financial Information by Segment The table below shows revenue, Adjusted Operating Income and operating income by reportable segment. Adjusted Operating Income is a financial metric utilized by the Company’s chief operating decision maker to assess the profitability of each reportable segment. Refer to Note 3 for further details on the components of the Company’s revenue. Three Months Ended June 30, 2019 2018 MIS MA Eliminations Consolidated MIS MA Eliminations Consolidated Revenue $ 771.4 $ 477.4 $ ( 35.2) $ 1,213.6 $ 782.9 $ 425.2 $ ( 33.0) $ 1,175.1 Operating, SG&A 307.0 342.8 ( 35.2) 614.6 303.6 320.1 ( 33.0) 590.7 Adjusted Operating Income 464.4 134.6 - 599.0 479.3 105.1 - 584.4 Less: Restructuring 26.5 27.3 - 53.8 - - - - Depreciation and amortization 18.0 33.0 - 51.0 16.7 31.7 - 48.4 Acquisition-Related Expenses - 2.0 - 2.0 - 2.0 - 2.0 Impairment pursuant to the planned divestiture of MAKS - 8.7 - 8.7 - - - - Operating income $ 419.9 $ 63.6 $ - $ 483.5 $ 462.6 $ 71.4 $ - $ 534.0 Six Months Ended June 30, 2019 2018 MIS MA Eliminations Consolidated MIS MA Eliminations Consolidated Revenue $ 1,473.8 $ 951.8 $ ( 69.9) $ 2,355.7 $ 1,532.6 $ 837.0 $ ( 67.8) $ 2,301.8 Operating, SG&A 623.8 683.9 ( 69.9) 1,237.8 614.0 630.5 ( 67.8) 1,176.7 Adjusted Operating Income 850.0 267.9 - 1,117.9 918.6 206.5 - 1,125.1 Less: Restructuring 29.2 30.1 - 59.3 - - - - Depreciation and amortization 35.0 66.3 - 101.3 33.5 64.0 - 97.5 Acquisition-Related Expenses - 3.4 - 3.4 - 2.8 - 2.8 Impairment pursuant to the planned divestiture of MAKS - 8.7 - 8.7 - - - - Operating income $ 785.8 $ 159.4 $ - $ 945.2 $ 885.1 $ 139.7 $ - $ 1,024.8 The cumulative restructuring charges related to the 2018 Restructuring Program, as more fully discussed in Note 13, for the MIS and MA reportable segments are $ 61.4 million and $ 46.6 million, respectively. Consolidated Revenue Information by Geographic Area Consolidated Revenue Information by Geographic Area: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 United States $ 637.9 $ 625.4 $ 1,250.0 $ 1,223.1 Non-U.S.: EMEA 362.7 356.1 695.3 703.4 Asia-Pacific 140.8 123.7 273.0 243.9 Americas 72.2 69.9 137.4 131.4 Total Non-U.S. 575.7 549.7 1,105.7 1,078.7 Total $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8

RECENTLY ISSUED ACCOUNTING STAN

RECENTLY ISSUED ACCOUNTING STANDARDS	6 Months Ended
	Jun. 30, 2019
Recently Issued Accounting Standards [Abstract]
RECENTLY ISSUED ACCOUNTING STANDARDS	NOTE 22. RECENTLY ISSUED ACCOUNTING STANDARDS In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”. The amendments in this ASU require the use of an “expected credit loss” impairment model for most financial assets reported at amortized cost, which will require entities to estimate expected credit losses over the lifetime of the instrument. This may result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, an allowance for credit losses will be recognized as a contra account to the amortized cost carrying value of the asset rather than a direct reduction to the carrying value, with changes in the allowance impacting earnings. In November 2018, the FASB issued ASU No. 2018-19 “Codification Improvements to Topic 326, Financial Instruments—Credit Losses,” which clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20, but instead should be accounted for in accordance with Topic 842, Leases. ASU No. 2016-13 is effective for annual and interim reporting periods beginning after December 15, 2019, with early adoption permitted in annual and interim reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first effective reporting period. The Company is currently evaluating the impact of this ASU on its financial statements. Currently, the Company believes that the most notable impact of this ASU will relate to its processes around the assessment of its allowance for doubtful accounts relating to accounts receivable. The Company is in the process of updating its policies and procedures in order to implement the “expected credit loss” impairment model, including identification of information that can be used to develop the reasonable and supportable forecasts that affect the collectability of the reported amount of the financial asset. The Company does not currently anticipate that the adoption of this ASU will have a significant impact on its consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, “Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting”, which simplifies the accounting for nonemployee share-based payment transactions. The amendments specify that ASC Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The ASU is effective for all entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The Company does not anticipate that the adoption of this ASU will have a significant impact on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract”. This ASU requires implementation costs incurred by customers in cloud computing arrangements (i.e., hosting arrangements) to be capitalized under the same premises of authoritative guidance for internal-use software, and deferred over the non-cancellable term of the cloud computing arrangements plus any option renewal periods that are reasonably certain to be exercised by the customer or for which the exercise is controlled by the service provider. The ASU is effective for all entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. The Company will be required to present the amortization of capitalized implementation costs in the same line item in the statement of operations as the fees associated with the hosting service (i.e. operating and SG&A expense) and classify the related payments in the statement of cash flows in the same manner as payments made for fees associated with the hosting service (i.e. cash flows from operating activities). This ASU also requires capitalization of implementation costs in the balance sheet to be consistent with the location of prepayment of fees for the hosting element (i.e. within other current assets or other assets). The Company is in the process of evaluating the impact of this ASU, but does not anticipate that its adoption will have a significant impact on its consolidated financial statements, other than the aforementioned classification requirements. In August 2018, the FASB issued ASU No. 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans”. This ASU eliminates requirements for certain disclosures and requires additional disclosures under defined benefit pension plans and other postretirement plans. The ASU is effective for all entities for fiscal years beginning after December 15, 2020 on a retrospective basis to all periods presented, with early adoption permitted. The Company is currently evaluating the impact of this ASU on its financial statements. In April 2019, the FASB issued ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825 Financial Instruments”. This ASU clarifies and improves guidance related to the recently issued standards updates on credit losses, hedging, and recognition and measurement of financial instruments. This ASU is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company does not anticipate that the adoption of this ASU will have a significant impact on its consolidated financial statements.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 23. SUBSEQUENT EVENTS On July 9, 2019, the Board approved the declaration of a quarterly dividend of $ 0.50 per share of Moody’s common stock, payable on September 10, 2019 to shareholders of record at the close of business on August 20, 2019. On July 16, 2019 the Company entered into an agreement to sell its Moody’s Analytics Knowledge Services (MAKS) business to Equistone Partners Europe Limited (Equistone), a European private equity firm. The MAKS business has been deemed to be held for sale in accordance with U.S. GAAP at June 30, 2019. Refer to Note 10 of the condensed consolidated financial statements for further information on the anticipated financial impact of this divestiture.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies [Abstract]
Leases	Leases The Company has operating leases, of which substantially all relate to the lease of office space. The Company’s leases which are classified as finance leases are not material to the condensed consolidated financial statements. The Company determines if an arrangement meets the definition of a lease at contract inception. The Company recognizes in its consolidated balance sheet a lease liability and an ROU Asset for all leases with a lease term greater than 12 months. In determining the length of the lease term, the Company utilizes judgment in assessing the likelihood of whether it is reasonably certain that it will exercise an option to extend or early-terminate a lease, if such options are provided in the lease agreement. ROU Assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU Assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As substantially all of the Company’s leases do not provide an implicit interest rate, the Company uses its estimated secured incremental borrowing rates at the lease commencement date in determining the present value of lease payments. These secured incremental borrowing rates are attributable to the currency in which the lease is denominated. At commencement, the Company’s initial measurement of the ROU Asset is calculated as the present value of the remaining lease payments (i.e., lease liability), with additive adjustments reflecting: initial direct costs (e.g., broker commissions) and prepaid lease payments (if any); and reduced by any lease incentives provided by the lessor if: (i) received before lease commencement or (ii) receipt of the lease incentive is contingent upon future events for which the occurrence is both probable and within the Company’s control. Lease expense for minimum operating lease payments is recognized on a straight-line basis over the lease term. This straight-line lease expense represents a single lease cost which is comprised of both an interest accretion component relating to the lease liability and amortization of the ROU Assets. The Company records this single lease cost in operating and SG&A expenses. However, in situations where an operating lease ROU Asset has been impaired, the subsequent amortization of the ROU Asset is then recorded on a straight-line basis over the remaining lease term and is combined with accretion expense on the lease liability to result in single operating lease cost (which subsequent to impairment will no longer follow a straight-line recognition pattern). The Company has lease agreements which include lease and non-lease components. For the Company’s office space leases, the lease components (e.g., fixed rent payments) and non-lease components (e.g., fixed common-area maintenance costs) are combined and accounted for as a single lease component. Variable lease payments (e.g. variable common-area-maintenance costs) are only included in the initial measurement of the lease liability to the extent those payments depend on an index or a rate. Variable lease payments not included in the lease liability are recognized in net income in the period in which the obligation for those payments is incurred.

DESCRIPTION OF BUSINESS AND B_2

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Tables)	6 Months Ended
	Jun. 30, 2019
Description of Business and Basis of Presentation [Abstract]
Schedule of Reclassification of Revenue Amount	MIS As previously reported Reclassification As Reclassified MA As previously reported Reclassification As Reclassified CFG RD&A Q1 $ 377.7 $ 11.9 $ 389.6 Q1 $ 269.2 $ ( 2.1) $ 267.1 Q2 377.6 13.4 391.0 Q2 279.9 ( 4.0) 275.9 Q3 296.1 11.2 307.3 Q3 282.6 ( 2.3) 280.3 Q4 282.7 8.6 291.3 Q4 302.4 ( 5.3) 297.1 Full year 2018 $ 1,334.1 $ 45.1 $ 1,379.2 Full year 2018 $ 1,134.1 $ ( 13.7) $ 1,120.4 SFG ERS Q1 $ 129.7 $ ( 11.9) $ 117.8 Q1 $ 100.1 $ 2.1 $ 102.2 Q2 141.6 ( 13.4) 128.2 Q2 105.5 4.0 109.5 Q3 125.4 ( 11.2) 114.2 Q3 113.0 2.3 115.3 Q4 129.8 ( 8.6) 121.2 Q4 118.8 5.3 124.1 Full year 2018 $ 526.5 $ ( 45.1) $ 481.4 Full year 2018 $ 437.4 $ 13.7 $ 451.1

REVENUES (Tables)

REVENUES (Tables)	6 Months Ended
	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 MIS: Corporate finance (CFG) (1) Investment-grade $ 95.8 $ 72.4 $ 193.2 $ 159.6 High-yield 68.2 58.7 125.5 116.6 Bank loans 83.5 121.3 156.1 231.4 Other accounts (2) 139.9 138.6 268.0 273.0 Total CFG 387.4 391.0 742.8 780.6 Structured finance (SFG) (1) Asset-backed securities 25.6 27.9 48.8 56.1 RMBS 24.1 26.8 47.6 51.1 CMBS 20.4 18.2 38.1 39.5 Structured credit 41.0 54.5 76.2 97.9 Other accounts 1.0 0.8 2.1 1.4 Total SFG 112.1 128.2 212.8 246.0 Financial institutions (FIG) Banking 84.6 77.3 164.2 154.3 Insurance 28.1 32.9 57.1 61.2 Managed investments 9.5 7.2 13.5 12.9 Other accounts 3.0 3.2 6.2 6.5 Total FIG 125.2 120.6 241.0 234.9 Public, project and infrastructure finance (PPIF) Public finance / sovereign 53.0 51.7 99.2 98.6 Project and infrastructure 55.6 56.4 102.1 102.7 Total PPIF 108.6 108.1 201.3 201.3 Total ratings revenue 733.3 747.9 1,397.9 1,462.8 MIS Other 5.1 4.4 10.6 9.4 Total external revenue 738.4 752.3 1,408.5 1,472.2 Intersegment royalty 33.0 30.6 65.3 60.4 Total MIS 771.4 782.9 1,473.8 1,532.6 MA: Research, data and analytics (RD&A) (3) 315.3 275.9 623.0 543.0 Enterprise risk solutions (ERS) (3) 117.7 109.5 239.6 211.7 Professional services (PS) 42.2 37.4 84.6 74.9 Total external revenue 475.2 422.8 947.2 829.6 Intersegment revenue 2.2 2.4 4.6 7.4 Total MA 477.4 425.2 951.8 837.0 Eliminations ( 35.2) ( 33.0) ( 69.9) ( 67.8) Total MCO $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8 (1) (2) (3)
Company's Reportable Segment Revenues Disaggregated by Segment and Geographic Region	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 MIS: U.S. $ 436.2 $ 451.2 $ 847.4 $ 884.6 Non-U.S.: EMEA 178.3 181.1 326.8 362.2 Asia-Pacific 83.9 79.6 162.8 152.2 Americas 40.0 40.4 71.5 73.2 Total Non-U.S. 302.2 301.1 561.1 587.6 Total MIS 738.4 752.3 1,408.5 1,472.2 MA: U.S. 201.7 174.2 402.6 338.5 Non-U.S.: EMEA 184.4 175.0 368.5 341.2 Asia-Pacific 56.9 44.1 110.2 91.7 Americas 32.2 29.5 65.9 58.2 Total Non-U.S. 273.5 248.6 544.6 491.1 Total MA 475.2 422.8 947.2 829.6 Total MCO $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8
Schedule of Changes in the Deferred Revenue Balances	Three Months Ended June 30, 2019 MIS MA Total Balance at March 31, 2019 $ 388.3 $ 794.9 $ 1,183.2 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 113.6) ( 340.4) ( 454.0) Increases due to amounts billable excluding amounts recognized as revenue during the period 100.9 246.0 346.9 Amount included in liabilities reclassified as held for sale - ( 2.7) ( 2.7) Effect of exchange rate changes 0.4 ( 3.0) ( 2.6) Total changes in deferred revenue ( 12.3) ( 100.1) ( 112.4) Balance at June 30, 2019 $ 376.0 $ 694.8 $ 1,070.8 Six Months Ended June 30, 2019 MIS MA Total Balance at January 1, 2019 $ 325.4 $ 750.3 $ 1,075.7 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 160.5) ( 533.6) ( 694.1) Increases due to amounts billable excluding amounts recognized as revenue during the period 210.1 479.2 689.3 Amount included in liabilities reclassified as held for sale - ( 2.7) ( 2.7) Effect of exchange rate changes 1.0 1.6 2.6 Total changes in deferred revenue 50.6 ( 55.5) ( 4.9) Balance at June 30, 2019 $ 376.0 $ 694.8 $ 1,070.8 Deferred revenue - current $ 261.7 $ 690.6 $ 952.3 Deferred revenue - noncurrent $ 114.3 $ 4.2 $ 118.5 Three Months Ended June 30, 2018 MIS MA Total Balance at March 31, 2018 $ 397.5 $ 729.0 $ 1,126.5 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 127.2) ( 304.8) ( 432.0) Increases due to amounts billable excluding amounts recognized as revenue during the period 112.6 206.9 319.5 Effect of exchange rate changes ( 5.4) ( 22.1) ( 27.5) Total changes in deferred revenue ( 20.0) ( 120.0) ( 140.0) Balance at June 30, 2018 $ 377.5 $ 609.0 $ 986.5 Six Months Ended June 30, 2018 MIS MA Total Balance at January 1, 2018 (after New Revenue Accounting Standard transition adjustment) $ 334.7 $ 611.6 $ 946.3 Changes in deferred revenue Revenue recognized that was included in the deferred revenue balance at the beginning of the period ( 165.4) ( 427.7) ( 593.1) Increases due to amounts billable excluding amounts recognized as revenue during the period 212.6 435.7 648.3 Effect of exchange rate changes ( 4.4) ( 10.6) ( 15.0) Total changes in deferred revenue 42.8 ( 2.6) 40.2 Balance at June 30, 2018 $ 377.5 $ 609.0 $ 986.5 Deferred revenue - current $ 255.9 $ 604.6 $ 860.5 Deferred revenue - noncurrent $ 121.6 $ 4.4 $ 126.0
LOB and Geographic Area [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 U.S. Non-U.S. Total U.S. Non-U.S. Total MIS: Corporate finance (CFG) (1) $ 242.6 $ 144.8 $ 387.4 $ 255.2 $ 135.8 $ 391.0 Structured finance (SFG) (1) 71.9 40.2 112.1 80.4 47.8 128.2 Financial institutions (FIG) 52.2 73.0 125.2 54.4 66.2 120.6 Public, project and infrastructure finance (PPIF) 69.4 39.2 108.6 61.1 47.0 108.1 Total ratings revenue 436.1 297.2 733.3 451.1 296.8 747.9 MIS Other 0.1 5.0 5.1 0.1 4.3 4.4 Total MIS 436.2 302.2 738.4 451.2 301.1 752.3 MA: Research, data and analytics (RD&A) (2) 137.8 177.5 315.3 118.2 157.7 275.9 Enterprise risk solutions (ERS) (2) 46.1 71.6 117.7 42.6 66.9 109.5 Professional services (PS) 17.8 24.4 42.2 13.4 24.0 37.4 Total MA 201.7 273.5 475.2 174.2 248.6 422.8 Total MCO $ 637.9 $ 575.7 $ 1,213.6 $ 625.4 $ 549.7 $ 1,175.1 Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 U.S. Non-U.S. Total U.S. Non-U.S. Total MIS: Corporate finance (CFG) (1) $ 485.2 $ 257.6 $ 742.8 $ 512.5 $ 268.1 $ 780.6 Structured finance (SFG) (1) 134.1 78.7 212.8 154.4 91.6 246.0 Financial institutions (FIG) 98.2 142.8 241.0 102.9 132.0 234.9 Public, project and infrastructure finance (PPIF) 129.6 71.7 201.3 114.5 86.8 201.3 Total ratings revenue 847.1 550.8 1,397.9 884.3 578.5 1,462.8 MIS Other 0.3 10.3 10.6 0.3 9.1 9.4 Total MIS 847.4 561.1 1,408.5 884.6 587.6 1,472.2 MA: Research, data and analytics (RD&A) (2) 272.6 350.4 623.0 230.8 312.2 543.0 Enterprise risk solutions (ERS) (2) 94.5 145.1 239.6 81.1 130.6 211.7 Professional services (PS) 35.5 49.1 84.6 26.6 48.3 74.9 Total MA 402.6 544.6 947.2 338.5 491.1 829.6 Total MCO $ 1,250.0 $ 1,105.7 $ 2,355.7 $ 1,223.1 $ 1,078.7 $ 2,301.8 (1) (2)
Transaction and Relationship Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Three Months Ended June 30, 2019 2018 Transaction Relationship Total Transaction Relationship Total Corporate Finance $ 276.4 $ 111.0 $ 387.4 $ 284.5 $ 106.5 $ 391.0 71% 29% 100% 73% 27% 100% Structured Finance $ 68.2 $ 43.9 $ 112.1 $ 85.2 $ 43.0 $ 128.2 61% 39% 100% 66% 34% 100% Financial Institutions $ 61.2 $ 64.0 $ 125.2 $ 56.2 $ 64.4 $ 120.6 49% 51% 100% 47% 53% 100% Public, Project and Infrastructure Finance $ 71.4 $ 37.2 $ 108.6 $ 69.6 $ 38.5 $ 108.1 66% 34% 100% 64% 36% 100% MIS Other $ 0.4 $ 4.7 $ 5.1 $ 0.4 $ 4.0 $ 4.4 8% 92% 100% 9% 91% 100% Total MIS $ 477.6 $ 260.8 $ 738.4 $ 495.9 $ 256.4 $ 752.3 65% 35% 100% 66% 34% 100% Moody's Analytics $ 69.2 (1) $ 406.0 $ 475.2 $ 66.9 (1) $ 355.9 $ 422.8 15% 85% 100% 16% 84% 100% Total Moody's Corporation $ 546.8 $ 666.8 $ 1,213.6 $ 562.8 $ 612.3 $ 1,175.1 45% 55% 100% 48% 52% 100% Six Months Ended June 30, 2019 2018 Transaction Relationship Total Transaction Relationship Total Corporate Finance $ 525.9 $ 216.9 $ 742.8 $ 567.9 $ 212.7 $ 780.6 71% 29% 100% 73% 27% 100% Structured Finance $ 125.5 $ 87.3 $ 212.8 $ 159.8 $ 86.2 $ 246.0 59% 41% 100% 65% 35% 100% Financial Institutions $ 109.1 $ 131.9 $ 241.0 $ 106.2 $ 128.7 $ 234.9 45% 55% 100% 45% 55% 100% Public, Project and Infrastructure Finance $ 126.1 $ 75.2 $ 201.3 $ 124.0 $ 77.3 $ 201.3 63% 37% 100% 62% 38% 100% MIS Other $ 0.9 $ 9.7 $ 10.6 $ 1.0 $ 8.4 $ 9.4 8% 92% 100% 11% 89% 100% Total MIS $ 887.5 $ 521.0 $ 1,408.5 $ 958.9 $ 513.3 $ 1,472.2 63% 37% 100% 65% 35% 100% Moody's Analytics $ 140.7 (1) $ 806.5 $ 947.2 $ 127.7 (1) $ 701.9 $ 829.6 15% 85% 100% 15% 85% 100% Total Moody's Corporation $ 1,028.2 $ 1,327.5 $ 2,355.7 $ 1,086.6 $ 1,215.2 $ 2,301.8 44% 56% 100% 47% 53% 100% (1)
Timing of Revenue Recognition [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 MIS MA Total MIS MA Total Revenue recognized at a point in time $ 477.6 $ 21.7 $ 499.3 $ 887.5 $ 52.1 $ 939.6 Revenue recognized over time 260.8 453.5 714.3 521.0 895.1 1,416.1 Total $ 738.4 $ 475.2 $ 1,213.6 $ 1,408.5 $ 947.2 $ 2,355.7 Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 MIS MA Total MIS MA Total Revenue recognized at a point in time $ 495.9 $ 14.0 $ 509.9 $ 958.9 $ 29.5 $ 988.4 Revenue recognized over time 256.4 408.8 665.2 513.3 800.1 1,313.4 Total $ 752.3 $ 422.8 $ 1,175.1 $ 1,472.2 $ 829.6 $ 2,301.8
MIS [Member]
Disaggregation of Revenue [Line Items]
Schedule of Expected Recognition Period for the Remaining Performance Obligations	MIS Total Less than 1 year 1 - 5 years 6 - 10 Years 11 - 15 years 16-20 years Over 20 Years $ 144.4 $ 23.4 $ 68.2 $ 37.5 $ 6.2 $ 4.0 $ 5.1
MA [Member]
Disaggregation of Revenue [Line Items]
Schedule of Expected Recognition Period for the Remaining Performance Obligations	MA Total Less than 1 Year 1 - 2 Years Over 2 Years $ 1,636.0 $ 1,147.1 $ 327.7 $ 161.2

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2019
Stock-Based Compensation [Abstract]
Stock-Based Compensation Cost and Associated Tax Benefit	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Stock-based compensation cost $ 34.2 $ 34.4 $ 69.9 $ 69.5 Tax benefit $ 7.3 $ 7.3 $ 15.1 $ 14.5
Weighted Average Assumptions used in Determining Fair Value for Options Granted	Expected dividend yield 1.15% Expected stock volatility 23.62% Risk-free interest rate 2.60% Expected holding period 6.2 years
Stock Option Exercises and Restricted Stock Vesting	Six Months Ended June 30, 2019 2018 Exercise of stock options: Proceeds from stock option exercises $ 23.4 $ 31.9 Aggregate intrinsic value $ 82.8 $ 84.4 Tax benefit realized upon exercise $ 20.2 $ 20.6 Number of shares exercised 0.6 0.7 Vesting of restricted stock: Fair value of shares vested $ 149.8 $ 148.7 Tax benefit realized upon vesting $ 35.5 $ 34.3 Number of shares vested 0.8 0.9 Vesting of performance-based restricted stock: Fair value of shares vested $ 47.5 $ 23.0 Tax benefit realized upon vesting $ 11.5 $ 5.5 Number of shares vested 0.3 0.1

INCOME TAXES (Tables)

INCOME TAXES (Tables)	6 Months Ended
	Jun. 30, 2019
Income Taxes [Abstract]
Income Taxes Paid	Six Months Ended June 30, 2019 2018 Income taxes paid $ 198.0 $ 237.3

WEIGHTED AVERAGE SHARES OUTST_2

WEIGHTED AVERAGE SHARES OUTSTANDING (Tables)	6 Months Ended
	Jun. 30, 2019
Weighted Average Shares Outstanding [Abstract]
Reconciliation of Basic to Diluted Shares Outstanding	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Basic 189.4 191.9 189.9 191.6 Dilutive effect of shares issuable under stock-based compensation plans 1.9 2.5 2.2 2.9 Diluted 191.3 194.4 192.1 194.5 Anti-dilutive options to purchase common shares and restricted stock as well as contingently issuable restricted stock which are excluded from the table above 0.3 0.5 0.3 0.7

CASH EQUIVALENT AND INVESTMEN_2

CASH EQUIVALENT AND INVESTMENTS (Tables)	6 Months Ended
	Jun. 30, 2019
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	As of June 30, 2019 Balance sheet location Cost Gross Unrealized Gains Fair Value Cash and cash equivalents Short-term investments Other assets Certificates of deposit and money market deposit accounts (1) $ 437.5 $ - $ 437.5 $ 327.4 $ 104.5 $ 5.6 Open ended mutual funds $ 13.5 $ 1.6 $ 15.1 $ - $ 15.0 $ 0.1 As of December 31, 2018 Balance sheet location Cost Gross Unrealized Gains Fair Value Cash and cash equivalents Short-term investments Other assets Money market mutual funds $ 15.2 $ - $ 15.2 $ 15.2 $ - $ - Certificates of deposit and money market deposit accounts (1) $ 1,022.4 $ - $ 1,022.4 $ 904.3 $ 115.8 $ 2.3 Open ended mutual funds $ 29.5 $ 3.8 $ 33.3 $ - $ 16.7 $ 16.6 (1) Consists of time deposits and money market deposit accounts. The remaining contractual maturities for the certificates of deposits classified as short-term investments were one month to 12 months at both June 30, 2019 and December 31, 2018. The remaining contractual maturities for the certificates of deposits classified in other assets are 13 to 24 months at June 30, 2019 and 14 to 36 months at December 31, 2018. Time deposits with a maturity of less than 90 days at time of purchase are classified as cash and cash equivalents.

ASSETS AND LIABILITIES HELD F_2

ASSETS AND LIABILITIES HELD FOR SALE (Tables)	6 Months Ended
	Jun. 30, 2019
Assets and Liabilities Held For Sale [Abstract]
Schedule of Assets and Liabilities Held for Sale	June 30, 2019 Assets Current assets: Cash and cash equivalents $ 8.0 Accounts receivable, net 20.5 Other current assets 6.1 Total current assets 34.6 Property and equipment, net 12.2 Goodwill 167.4 Intangible assets, net 44.1 Deferred tax assets, net 5.7 Other assets 2.8 Total assets held for sale prior to impairment $ 266.8 Impairment of assets held for sale ( 8.7) Total assets held for sale $ 258.1 Liabilities Current liabilities: Accounts payable and accrued liabilities $ 16.0 Deferred revenue 2.7 Total current liabilities 18.7 Deferred tax liabilities, net 7.4 Uncertain tax positions 29.3 Other liabilities 24.5 Total liabilities held for sale $ 79.9 Derivation of impairment charge Total net assets held for sale prior to impairment $ 186.9 Currency translation adjustment (1) 26.6 Total net assets held for sale including currency translation adjustment $ 213.5 Estimated fair value less costs to sell 204.8 Impairment of assets held for sale $ 8.7 (1)

DERIVATIVE INSTRUMENTS AND HE_2

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative [Line Items]
Schedule of Interest Rate Swap	Notional Amount Floating Interest Rate As of As of Hedged Item Nature of Swap June 30, 2019 December 31, 2018 2010 Senior Notes due 2020 Pay Floating/Receive Fixed $ 500.0 $ 500.0 3-month USD LIBOR 2012 Senior Notes due 2022 Pay Floating/Receive Fixed 330.0 330.0 3-month USD LIBOR 2017 Senior Notes due 2021 Pay Floating/Receive Fixed 500.0 500.0 3-month USD LIBOR 2017 Senior Notes due 2023 Pay Floating/Receive Fixed 250.0 - 3-month USD LIBOR Total $ 1,580.0 $ 1,330.0
Gains and Losses on Derivatives Designated as Hedging Instruments	Amount of income/(loss) recognized in the consolidated statements of operations Total amounts of financial statement line item presented in the statements of operations in which the effects of fair value hedges are recorded Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Interest expense, net $ ( 50.6) $ ( 53.4) $ ( 103.1) $ ( 104.1) Descriptions Location on Consolidated Statements of Operations Net interest settlements and accruals on interest rate swaps Interest expense, net $ 0.1 $ ( 0.4) $ ( 0.1) $ ( 0.5) Fair value changes on interest rate swaps Interest expense, net $ 19.8 $ ( 2.3) $ 30.6 $ ( 11.5) Fair value changes on hedged debt Interest expense, net $ ( 19.8) $ 2.3 $ ( 30.6) $ 11.5
Amount of Gain/(Loss) Recognized in AOCI on Derivative Net Investment Hedging Relationships (Effectiveness Portion)	Derivative and Non-Derivative Instruments in Net Investment Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing) Three Months Ended Three Months Ended Three Months Ended June 30, June 30, June 30, 2019 2018 2019 2018 2019 (2) 2018 Cross currency swaps $ ( 19.7) $ 4.0 $ - $ - $ 13.5 $ 2.1 Long-term debt ( 9.5) (1) 23.4 - - - - Total net investment hedges $ ( 29.2) $ 27.4 $ - $ - $ 13.5 $ 2.1 Derivatives in Cash Flow Hedging Relationships Cross currency swap $ - $ - $ - $ 0.1 $ - $ - Interest rate contracts - - (0.1) - - - Total cash flow hedges $ - $ - $ ( 0.1) $ 0.1 $ - $ - Total $ ( 29.2) $ 27.4 $ ( 0.1) $ 0.1 $ 13.5 $ 2.1 Derivative and Non-Derivative Instruments in Net Investment Hedging Relationships Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing) Six Months Ended Six Months Ended Six Months Ended June 30, June 30, June 30, 2019 2018 2019 2018 2019 (2) 2018 Cross currency swaps $ ( 4.5) $ 4.0 $ - $ - $ 21.8 $ 2.1 Long-term debt ( 1.2) (1) 12.5 - - - - Total net investment hedges $ ( 5.7) $ 16.5 $ - $ - $ 21.8 $ 2.1 Derivatives in Cash Flow Hedging Relationships Cross currency swap $ - $ 1.5 $ ( 0.1) $ 0.2 $ - $ - Total cash flow hedges $ - $ 1.5 $ ( 0.1) $ 0.2 $ - $ - Total $ ( 5.7) $ 18.0 $ ( 0.1) $ 0.2 $ 21.8 $ 2.1 (1) Due to the Company's adoption of ASU 2018-02 during the first half of 2019, $ 2.5 million related to the tax effect of this net investment hedge was reclassified to retained earnings. Refer to Note 1 for further details. (2) Effective with the adoption of ASU 2017-12, the Company has elected to assess the effectiveness of its net investment hedges based on changes in spot exchange rates. Accordingly, amounts related to cross-currency swaps recognized directly into Net Income during the first half of 2019 represent net periodic interest settlements and accruals, which are recognized in interest expense, net.
Components of Accumulated Other Comprehensive Income	Three Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance March 31, $ ( 69.0) $ 0.1 $ ( 440.3) $ 53.7 $ ( 455.5) $ ( 60.5) $ 2.3 $ 18.5 $ ( 12.2) $ - $ ( 51.9) Other comprehensive income/(loss) before reclassifications ( 2.1) - 40.0 ( 29.2) 8.7 1.2 - ( 282.1) 27.4 - ( 253.5) Amounts reclassified from AOCI 0.6 0.1 - - 0.7 0.7 ( 0.1) - - - 0.6 Other comprehensive income/(loss) ( 1.5) 0.1 40.0 ( 29.2) 9.4 1.9 ( 0.1) ( 282.1) 27.4 - ( 252.9) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8) Six Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance December 31, $ ( 53.1) $ 0.1 $ ( 406.0) $ 32.7 $ ( 426.3) $ ( 61.5) $ 0.9 $ ( 112.6) $ ( 1.3) $ 2.3 $ ( 172.2) Adoption of ASU 2016-01 relating to financial instruments - - - - - - - - - ( 2.3) ( 2.3) Other comprehensive income/(loss) before reclassifications ( 1.3) - 5.7 ( 5.7) ( 1.3) 1.2 1.5 ( 151.0) 16.5 - ( 131.8) Amounts reclassified from AOCI 1.2 0.1 - - 1.3 1.7 ( 0.2) - - - 1.5 Adoption of ASU 2018-02 (See Note 1) ( 17.3) - - ( 2.5) ( 19.8) - - - - - - Other comprehensive income/(loss) ( 17.4) 0.1 5.7 ( 8.2) ( 19.8) 2.9 1.3 ( 151.0) 16.5 ( 2.3) ( 132.6) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8)
Summary of Notional Amounts of Outstanding Foreign Exchange Forwards	June 30, 2019 December 31, 2018 Notional amount of currency pair: Sell Buy Sell Buy Contracts to sell USD for GBP $ 382.7 £ 299.5 $ 310.3 £ 241.2 Contracts to sell USD for Japanese Yen $ 15.0 ¥ 1,600.0 $ 14.3 ¥ 1,600.0 Contracts to sell USD for Canadian dollars $ 96.8 C$ 130.0 $ 99.0 C$ 130.0 Contracts to sell USD for Singapore dollars $ 35.0 S$ 48.0 $ - S$ - Contracts to sell USD for Euros $ 135.8 € 120.0 $ 212.8 € 184.6 NOTE: € = Euro, £ = British pound, $ = U.S. dollar, ¥ = Japanese Yen, C$ = Canadian dollar, S$= Singapore dollars
Gains and Losses Recognized in Consolidated Statement of Operations on Derivatives Not Designated as Hedging instruments	Three Months Ended Six Months Ended Derivatives not designated as accounting hedges June 30, June 30, Location on Statement of Operations 2019 2018 2019 2018 Foreign exchange forwards Other non-operating expense, net $ ( 9.9) $ ( 44.9) $ ( 8.5) $ ( 17.3)
Fair Value of Derivative Instruments	Derivative and Non-Derivative Instruments Balance Sheet Location June 30, 2019 December 31, 2018 Assets: Derivatives designated as accounting hedges: Cross-currency swaps designated as net investment hedges Other assets $ 21.3 $ 19.4 Interest rate swaps designated as fair value hedges Other assets 32.8 7.5 Total derivatives designated as accounting hedges 54.1 26.9 Derivatives not designated as accounting hedges: FX forwards on certain assets and liabilities Other current assets 5.0 1.4 Total assets $ 59.1 $ 28.3 Liabilities: Derivatives designated as accounting hedges: Cross-currency swaps designated as net investment hedges Other liabilities $ 10.9 $ 2.9 Interest rate swaps designated as fair value hedges Other liabilities - 5.3 Total derivatives designated as accounting hedges 10.9 8.2 Non-derivatives designated as accounting hedges: Long-term debt designated as net investment hedge Long-term debt 569.4 571.6 Derivatives not designated as accounting hedges: FX forwards on certain assets and liabilities Accounts payable and accrued liabilities 1.6 8.2 Total liabilities $ 581.9 $ 588.0
Designated As Hedging Instrument [Member]
Derivative [Line Items]
Schedule of Interest Rate Swap	June 30, 2019 Pay Receive Nature of Swap Notional Amount Weighted Average Interest Rate Notional Amount Weighted Average Interest Rate Pay Fixed/Receive Fixed € 1,079.1 1.43% $ 1,220.0 3.96% Pay Floating/Receive Floating 931.3 Based on 3-month EURIBOR 1,080.0 Based on 3-month USD LIBOR Total € 2,010.4 $ 2,300.0 December 31, 2018 Pay Receive Nature of Swap Notional Amount Weighted Average Interest Rate Notional Amount Weighted Average Interest Rate Pay Floating/Receive Floating € 710.2 Based on 3-month EURIBOR $ 830.0 Based on 3-month USD LIBOR Total € 710.2 $ 830.0

GOODWILL AND OTHER ACQUIRED I_2

GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill And Other Acquired Intangible Assets [Abstract]
Activity in Goodwill	Six Months Ended June 30, 2019 MIS MA Consolidated Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Balance at beginning of year $ 257.8 $ - $ 257.8 $ 3,535.7 $ ( 12.2) $ 3,523.5 $ 3,793.5 $ ( 12.2) $ 3,781.3 Additions/ adjustments (1) 43.6 - 43.6 - - - 43.6 - 43.6 Foreign currency translation adjustments 11.3 - 11.3 ( 3.9) - ( 3.9) 7.4 - 7.4 Reclassification to assets held for sale (See Note 10) (2) - - - ( 167.4) - ( 167.4) ( 167.4) - ( 167.4) Ending balance $ 312.7 $ - $ 312.7 $ 3,364.4 $ ( 12.2) $ 3,352.2 $ 3,677.1 $ ( 12.2) $ 3,664.9 Year Ended December 31, 2018 MIS MA Consolidated Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Gross goodwill Accumulated impairment charge Net goodwill Balance at beginning of year $ 285.2 $ - $ 285.2 $ 3,480.2 $ ( 12.2) $ 3,468.0 $ 3,765.4 $ ( 12.2) $ 3,753.2 Additions/ adjustments (3) - - - 211.5 - 211.5 211.5 - 211.5 Foreign currency translation adjustments ( 27.4) - ( 27.4) ( 156.0) - ( 156.0) ( 183.4) - ( 183.4) Ending balance $ 257.8 $ - $ 257.8 $ 3,535.7 $ ( 12.2) $ 3,523.5 $ 3,793.5 $ ( 12.2) $ 3,781.3 (1) (2) (3)
Acquired Intangible Assets and Related Amortization	June 30, December 31, 2019 2018 Customer relationships $ 1,284.3 $ 1,367.5 Accumulated amortization ( 206.0) ( 214.2) Net customer relationships 1,078.3 1,153.3 Trade secrets 30.0 29.8 Accumulated amortization ( 28.5) ( 28.2) Net trade secrets 1.5 1.6 Software/product technology 353.2 353.3 Accumulated amortization ( 115.0) ( 101.8) Net software/product technology 238.2 251.5 Trade names 146.0 155.1 Accumulated amortization ( 26.8) ( 34.1) Net trade names 119.2 121.0 Other (1) 78.5 70.4 Accumulated amortization ( 29.7) ( 31.7) Net other 48.8 38.7 Total acquired intangible assets, net $ 1,486.0 $ 1,566.1 (1)
Amortization Expense Relating to Acquired Intangible Assets	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Amortization expense $ 26.2 $ 25.1 $ 52.6 $ 50.8
Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization	Year Ending December 31, 2019 (after June 30) $ 48.5 2020 95.9 2021 95.7 2022 95.7 2023 92.6 Thereafter 1,057.6 Total estimated future amortization $ 1,486.0

RESTRUCTURING (Tables)

RESTRUCTURING (Tables)	6 Months Ended
	Jun. 30, 2019
Restructuring [Abstract]
Restructuring Expenses Included in Consolidated Statements of Operations	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Restructuring $ 53.8 $ - $ 59.3 $ -
Changes to the Restructuring Liability	Employee Termination Costs Contract Termination Costs Total Restructuring Liability (2) Balance as of December 31, 2018 $ 29.9 $ 12.4 $ 42.3 2018 Restructuring Program: Adoption of New Lease Accounting Standard (1) - ( 10.9) ( 10.9) Cost incurred and adjustments 26.1 4.3 30.4 Cash payments and adjustments ( 19.1) ( 2.6) ( 21.7) Balance as of June 30, 2019 $ 36.9 $ 3.2 $ 40.1 2018 Restructuring Program: Cumulative expense incurred to date $ 59.0 $ 49.0 (1) Upon the adoption of the New Lease Accounting Standard, the Company recorded a reclassification of $ 10.9 million of liabilities in the first quarter of 2019 for costs associated with certain real estate leases which were exited in previous years, as a reduction of the ROU Asset capitalized upon adoption. (2) The liability excludes $ 4.1 million of non-cash acceleration of amortization of leasehold improvements relating to the rationalization and exit of certain real estate leases as well as $ 24.8 million of ROU Asset impairment charges for the six months ended June 30, 2019. The fair value of the impaired ROU Assets was determined by utilizing the present value of the estimated future cash flows attributable to the assets. The fair value of those ROU assets subsequent to the impairment was $ 17.7 million, and is categorized as Level 3 within the ASC Topic 820 fair value hierarchy.

FAIR VALUE (Tables)

FAIR VALUE (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value [Abstract]
Financial Instruments Carried at Fair Value on Recurring Basis	Fair Value Measurement as of June 30, 2019 Description Balance Level 1 Level 2 Assets: Derivatives (1) $ 59.1 $ - $ 59.1 Mutual funds 15.1 15.1 - Total $ 74.2 $ 15.1 $ 59.1 Liabilities: Derivatives (1) $ 12.5 $ - $ 12.5 Total $ 12.5 $ - $ 12.5 Fair Value Measurement as of December 31, 2018 Description Balance Level 1 Level 2 Assets: Derivatives (1) $ 28.3 $ - $ 28.3 Money market mutual funds 15.2 15.2 - Mutual funds 33.3 33.3 - Total $ 76.8 $ 48.5 $ 28.3 Liabilities: Derivatives (1) $ 16.4 $ - $ 16.4 Total $ 16.4 $ - $ 16.4 (1)

OTHER BALANCE SHEET AND STATE_2

OTHER BALANCE SHEET AND STATEMENT OF OPERATIONS INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2019
Other Balance Sheet And Statement Of Operations Information [Abstract]
Additional Details Related to Certain Balance Sheet Captions	June 30, 2019 December 31, 2018 Other current assets: Prepaid taxes $ 147.7 $ 100.1 Prepaid expenses 86.2 102.0 Capitalized costs to obtain and fulfill sales contracts 73.4 77.2 Other 28.5 3.0 Total other current assets $ 335.8 $ 282.3 Other assets: Investments in non-consolidated affiliates $ 121.4 $ 104.6 Deposits for real-estate leases 14.6 13.5 Indemnification assets related to acquisitions 16.2 16.1 Mutual funds and fixed deposits 5.7 18.9 Costs to obtain sales contracts 89.1 78.0 Cross currency and interest rate swaps 54.1 26.9 Other 16.4 16.3 Total other assets $ 317.5 $ 274.3 June 30, 2019 December 31, 2018 Accounts payable and accrued liabilities: Salaries and benefits $ 101.9 $ 112.5 Incentive compensation 95.9 154.5 Customer credits, advanced payments and advanced billings 21.3 20.4 Self-insurance reserves 11.4 10.6 Dividends 5.0 6.5 Professional service fees 57.9 47.7 Interest accrued on debt 66.2 70.5 Accounts payable 4.9 30.1 Income taxes 75.1 71.4 Pension and other retirement employee benefits 6.5 6.4 Accrued royalties 13.3 25.1 Foreign exchange forwards on certain assets and liabilities 1.6 8.2 Restructuring liability 34.3 35.5 Other 93.4 95.8 Total accounts payable and accrued liabilities $ 588.7 $ 695.2 Other liabilities: Pension and other retirement employee benefits $ 265.9 $ 249.2 Deferred rent - non-current portion (1) - 94.3 Interest accrued on UTPs 69.8 69.6 Income tax liability - non-current portion (2) 125.3 125.3 Cross currency and interest rate swaps 10.9 8.2 Restructuring liability 5.8 6.8 Other 13.8 23.1 Total other liabilities $ 491.5 $ 576.5 (1) (2)
Other Non-Operating	Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 FX (loss)/gain $ ( 9.4) $ 6.2 $ ( 15.6) $ 0.3 Net periodic pension costs - other components 4.4 2.9 8.9 5.2 Income from investments in non-consolidated affiliates 5.6 4.6 6.8 5.9 Other ( 0.2) 1.2 2.6 4.5 Total $ 0.4 $ 14.9 $ 2.7 $ 15.9

COMPREHENSIVE INCOME AND ACCU_2

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	6 Months Ended
	Jun. 30, 2019
Comprehensive Income And Accumulated Other Comprehensive Income [Abstract]
Reclassifications out of AOCI	Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Affected line in the consolidated statement of operations Losses on cash flow hedges Cross-currency swap - ( 0.1) Other non-operating income (expense), net Interest rate contract ( 0.1) - Interest expense, net Total before income taxes ( 0.1) ( 0.1) Income tax effect of items above - - Provision for income taxes Total net losses on cash flow hedges ( 0.1) ( 0.1) Pension and other retirement benefits Amortization of actuarial losses and prior service costs included in net income ( 0.5) ( 1.0) Operating expense Amortization of actuarial losses and prior service costs included in net income ( 0.3) ( 0.6) SG&A expense Total before income taxes ( 0.8) ( 1.6) Income tax effect of item above 0.2 0.4 Provision for income taxes Total pension and other retirement benefits ( 0.6) ( 1.2) Total net losses included in Net Income attributable to reclassifications out of AOCI $ ( 0.7) $ ( 1.3) Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Affected line in the consolidated statement of operations Gains on cash flow hedges Cross-currency swap $ 0.1 $ 0.2 Other non-operating income (expense), net Income tax effect of item above - - Provision for income taxes Total net gains on cash flow hedges 0.1 0.2 Pension and other retirement benefits Amortization of actuarial losses and prior service costs included in net income ( 0.7) ( 1.6) Operating expense Amortization of actuarial losses and prior service costs included in net income ( 0.3) ( 0.8) SG&A expense Total before income taxes ( 1.0) ( 2.4) Income tax effect of item above 0.3 0.7 Provision for income taxes Total pension and other retirement benefits ( 0.7) ( 1.7) Total net losses included in Net Income attributable to reclassifications out of AOCI $ ( 0.6) $ ( 1.5)
Components of Accumulated Other Comprehensive Income	Three Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance March 31, $ ( 69.0) $ 0.1 $ ( 440.3) $ 53.7 $ ( 455.5) $ ( 60.5) $ 2.3 $ 18.5 $ ( 12.2) $ - $ ( 51.9) Other comprehensive income/(loss) before reclassifications ( 2.1) - 40.0 ( 29.2) 8.7 1.2 - ( 282.1) 27.4 - ( 253.5) Amounts reclassified from AOCI 0.6 0.1 - - 0.7 0.7 ( 0.1) - - - 0.6 Other comprehensive income/(loss) ( 1.5) 0.1 40.0 ( 29.2) 9.4 1.9 ( 0.1) ( 282.1) 27.4 - ( 252.9) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8) Six Months Ended June 30, 2019 June 30, 2018 Gains/(Losses) Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Total Pension and Other Retirement Benefits Cash Flow Hedges Foreign Currency Translation Adjustments Net Investment Hedges Gains on Available for Sale Securities Total Balance December 31, $ ( 53.1) $ 0.1 $ ( 406.0) $ 32.7 $ ( 426.3) $ ( 61.5) $ 0.9 $ ( 112.6) $ ( 1.3) $ 2.3 $ ( 172.2) Adoption of ASU 2016-01 relating to financial instruments - - - - - - - - - ( 2.3) ( 2.3) Other comprehensive income/(loss) before reclassifications ( 1.3) - 5.7 ( 5.7) ( 1.3) 1.2 1.5 ( 151.0) 16.5 - ( 131.8) Amounts reclassified from AOCI 1.2 0.1 - - 1.3 1.7 ( 0.2) - - - 1.5 Adoption of ASU 2018-02 (See Note 1) ( 17.3) - - ( 2.5) ( 19.8) - - - - - - Other comprehensive income/(loss) ( 17.4) 0.1 5.7 ( 8.2) ( 19.8) 2.9 1.3 ( 151.0) 16.5 ( 2.3) ( 132.6) Balance June 30, $ ( 70.5) $ 0.2 $ ( 400.3) $ 24.5 $ ( 446.1) $ ( 58.6) $ 2.2 $ ( 263.6) $ 15.2 $ - $ ( 304.8)

PENSION AND OTHER POST-RETIRE_2

PENSION AND OTHER POST-RETIREMENT BENEFITS (Tables)	6 Months Ended
	Jun. 30, 2019
Pension And Other Retirement Benefits [Abstract]
Components of Net Periodic Benefit Expense Related to Post-Retirement Plans	Three Months Ended June 30, Pension Plans Other Retirement Plans 2019 2018 2019 2018 Components of net periodic expense Service cost $ 4.0 $ 4.6 $ 0.7 $ 0.8 Interest cost 5.2 4.4 0.3 0.2 Expected return on plan assets ( 5.1) ( 3.8) - - Amortization of net actuarial loss from earlier periods 1.0 1.5 - - Amortization of net prior service costs from earlier periods ( 0.1) ( 0.1) - - Net periodic expense $ 5.0 $ 6.6 $ 1.0 $ 1.0 Six Months Ended June 30, Pension Plans Other Retirement Plans 2019 2018 2019 2018 Components of net periodic expense Service cost $ 8.3 $ 9.4 $ 1.4 $ 1.5 Interest cost 10.3 8.8 0.6 0.5 Expected return on plan assets ( 10.1) ( 7.6) - - Amortization of net actuarial loss from earlier periods 1.9 3.1 - - Amortization of net prior service costs from earlier periods ( 0.2) ( 0.2) ( 0.1) ( 0.1) Net periodic expense $ 10.2 $ 13.5 $ 1.9 $ 1.9

INDEBTEDNESS (Tables)

INDEBTEDNESS (Tables)	6 Months Ended
	Jun. 30, 2019
Indebtedness [Abstract]
Summary of Total Indebtedness	June 30, 2019 Principal Amount Fair Value of Interest Rate Swaps (1) Unamortized (Discount) Premium Unamortized Debt Issuance Costs Carrying Value Notes Payable: 5.50% 2010 Senior Notes, due 2020 $ 500.0 $ 2.3 $ ( 0.5) $ ( 0.5) $ 501.3 4.50% 2012 Senior Notes, due 2022 500.0 10.1 ( 1.4) ( 1.2) 507.5 4.875% 2013 Senior Notes, due 2024 500.0 - ( 1.4) ( 1.8) 496.8 5.25% 2014 Senior Notes (30-Year), due 2044 600.0 - 3.2 ( 5.4) 597.8 1.75% 2015 Senior Notes, due 2027 569.4 - - ( 2.9) 566.5 2.75% 2017 Senior Notes, due 2021 500.0 13.1 ( 0.8) ( 2.0) 510.3 2.625% 2017 Senior Notes, due 2023 500.0 7.3 ( 0.8) ( 2.6) 503.9 3.25% 2017 Senior Notes, due 2028 500.0 - ( 4.5) ( 3.5) 492.0 3.25% 2018 Senior Notes, due 2021 300.0 - ( 0.3) ( 1.2) 298.5 4.25% 2018 Senior Notes, due 2029 400.0 - ( 2.9) ( 3.1) 394.0 4.875% 2018 Senior Notes, due 2048 400.0 - ( 6.6) ( 4.0) 389.4 Commercial Paper 130.0 - ( 0.1) - 129.9 Total debt $ 5,399.4 $ 32.8 $ ( 16.1) $ ( 28.2) $ 5,387.9 Current portion ( 129.9) Total long-term debt $ 5,258.0 December 31, 2018 Principal Amount Fair Value of Interest Rate Swaps (1) Unamortized (Discount) Premium Unamortized Debt Issuance Costs Carrying Value Notes Payable: 5.50% 2010 Senior Notes, due 2020 $ 500.0 $ ( 3.7) $ ( 0.6) $ ( 0.7) $ 495.0 4.50% 2012 Senior Notes, due 2022 500.0 1.9 ( 1.6) ( 1.4) 498.9 4.875% 2013 Senior Notes, due 2024 500.0 - ( 1.5) ( 2.0) 496.5 2.75% 2014 Senior Notes (5-Year), due 2019 450.0 - ( 0.1) - 449.9 5.25% 2014 Senior Notes (30-Year), due 2044 600.0 - 3.2 ( 5.5) 597.7 1.75% 2015 Senior Notes, due 2027 571.6 - - ( 3.1) 568.5 2.75% 2017 Senior Notes, due 2021 500.0 4.0 ( 1.0) ( 2.4) 500.6 2.625% 2017 Senior Notes, due 2023 500.0 - ( 0.9) ( 2.8) 496.3 3.25% 2017 Senior Notes, due 2028 500.0 - ( 4.7) ( 3.7) 491.6 3.25% 2018 Senior Notes, due 2021 300.0 - ( 0.4) ( 1.5) 298.1 4.25% 2018 Senior Notes, due 2029 400.0 - ( 3.0) ( 3.3) 393.7 4.875% 2018 Senior Notes, due 2048 400.0 - ( 6.7) ( 4.1) 389.2 Total debt $ 5,721.6 $ 2.2 $ ( 17.3) $ ( 30.5) $ 5,676.0 Current portion ( 449.9) Total long-term debt $ 5,226.1 (1)
Principal Payments Due on Long-Term Borrowings	Year Ending December 31, 2010 Senior Notes due 2020 2012 Senior Notes due 2022 2013 Senior Notes due 2024 2014 Senior Notes (30-year) due 2044 2015 Senior Notes due 2027 2017 Senior Notes due 2021 2017 Senior Notes due 2023 2017 Senior Notes due 2028 2018 Senior Notes due 2021 2018 Senior Notes due 2029 2018 Senior Notes due 2048 Commercial Paper Total 2019 (After June 30) $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ 130.0 $ 130.0 2020 500.0 - - - - - - - - - - - 500.0 2021 - - - - - 500.0 - - 300.0 - - - 800.0 2022 - 500.0 - - - - - - - - - - 500.0 2023 - - - - - - 500.0 - - - - - 500.0 Thereafter - - 500.0 600.0 569.4 - - 500.0 - 400.0 400.0 - 2,969.4 Total $ 500.0 $ 500.0 $ 500.0 $ 600.0 $ 569.4 $ 500.0 $ 500.0 $ 500.0 $ 300.0 $ 400.0 $ 400.0 $ 130.0 $ 5,399.4
Summary of Components of Interest as Presented in Consolidated Statements of Operations	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Income $ 3.9 $ 3.4 $ 8.9 $ 6.6 Expense on borrowings ( 41.7) ( 49.4) ( 88.3) ( 100.7) UTPs and other tax related liabilities ( 7.6) ( 2.8) ( 13.2) ( 1.0) Net periodic pension costs - interest component ( 5.6) ( 4.9) ( 11.2) ( 9.6) Capitalized 0.4 0.3 0.7 0.6 Total $ ( 50.6) $ ( 53.4) $ ( 103.1) $ ( 104.1)
Interest Paid	Six Months Ended June 30, 2019 2018 Interest paid $ 97.7 $ 102.5
Fair Value and Carrying Value of Long-Term Debt	June 30, 2019 December 31, 2018 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value 5.50% 2010 Senior Notes, due 2020 $ 501.3 $ 517.8 $ 495.0 $ 517.7 4.50%2012 Senior Notes, due 2022 507.5 529.4 498.9 513.7 4.875% 2013 Senior Notes, due 2024 496.8 547.4 496.5 522.4 2.75% 2014 Senior Notes (5-Year), due 2019 - - 449.9 449.9 5.25% 2014 Senior Notes (30-Year), due 2044 597.8 713.4 597.7 638.1 1.75% 2015 Senior Notes, due 2027 566.5 615.7 568.5 585.3 2.75% 2017 Senior Notes, due 2021 510.3 504.5 500.6 489.7 2.625% 2017 Senior Notes, due 2023 503.9 501.2 496.3 476.9 3.25% 2017 Senior Notes, due 2028 492.0 506.3 491.6 472.8 3.25% 2018 Senior Notes, due 2021 298.5 305.0 298.1 298.6 4.25% 2018 Senior Notes, due 2029 394.0 436.4 393.7 407.6 4.875% 2018 Senior Notes, due 2048 389.4 461.0 389.2 409.8 Total $ 5,258.0 $ 5,638.1 $ 5,676.0 $ 5,782.5

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Cost	Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 24.5 $ 49.1 Short-term lease cost - 0.4 Variable lease cost 4.1 7.7 Total lease cost $ 28.6 $ 57.2
Schedule of Operating Leases Information	Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Cash paid for amounts included in the measurement of operating lease liabilities $ 27.0 $ 53.2 Right-of-use assets obtained in exchange for new operating lease liabilities $ 6.9 $ 15.9 June 30, 2019 Weighted-average remaining lease term 7.3 years Weighted-average discount rate applied to operating leases 3.6%
Operating Leases, Future Minimum Payment	Year Ending December 31, Operating Leases 2019 (After June 30) $ 54.8 2020 106.9 2021 100.5 2022 87.2 2023 81.7 After 2023 248.1 Total lease payments (undiscounted) 679.2 Less: Interest 79.9 Present value of lease liabilities: $ 599.3 Lease liabilities - current $ 89.1 Lease liabilities - noncurrent $ 510.2

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting Information [Line Items]
Financial Information by Segment	Three Months Ended June 30, 2019 2018 MIS MA Eliminations Consolidated MIS MA Eliminations Consolidated Revenue $ 771.4 $ 477.4 $ ( 35.2) $ 1,213.6 $ 782.9 $ 425.2 $ ( 33.0) $ 1,175.1 Operating, SG&A 307.0 342.8 ( 35.2) 614.6 303.6 320.1 ( 33.0) 590.7 Adjusted Operating Income 464.4 134.6 - 599.0 479.3 105.1 - 584.4 Less: Restructuring 26.5 27.3 - 53.8 - - - - Depreciation and amortization 18.0 33.0 - 51.0 16.7 31.7 - 48.4 Acquisition-Related Expenses - 2.0 - 2.0 - 2.0 - 2.0 Impairment pursuant to the planned divestiture of MAKS - 8.7 - 8.7 - - - - Operating income $ 419.9 $ 63.6 $ - $ 483.5 $ 462.6 $ 71.4 $ - $ 534.0 Six Months Ended June 30, 2019 2018 MIS MA Eliminations Consolidated MIS MA Eliminations Consolidated Revenue $ 1,473.8 $ 951.8 $ ( 69.9) $ 2,355.7 $ 1,532.6 $ 837.0 $ ( 67.8) $ 2,301.8 Operating, SG&A 623.8 683.9 ( 69.9) 1,237.8 614.0 630.5 ( 67.8) 1,176.7 Adjusted Operating Income 850.0 267.9 - 1,117.9 918.6 206.5 - 1,125.1 Less: Restructuring 29.2 30.1 - 59.3 - - - - Depreciation and amortization 35.0 66.3 - 101.3 33.5 64.0 - 97.5 Acquisition-Related Expenses - 3.4 - 3.4 - 2.8 - 2.8 Impairment pursuant to the planned divestiture of MAKS - 8.7 - 8.7 - - - - Operating income $ 785.8 $ 159.4 $ - $ 945.2 $ 885.1 $ 139.7 $ - $ 1,024.8
Company's Reportable Segment Revenues Disaggregated by Segment and Geographic Region	Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 MIS: U.S. $ 436.2 $ 451.2 $ 847.4 $ 884.6 Non-U.S.: EMEA 178.3 181.1 326.8 362.2 Asia-Pacific 83.9 79.6 162.8 152.2 Americas 40.0 40.4 71.5 73.2 Total Non-U.S. 302.2 301.1 561.1 587.6 Total MIS 738.4 752.3 1,408.5 1,472.2 MA: U.S. 201.7 174.2 402.6 338.5 Non-U.S.: EMEA 184.4 175.0 368.5 341.2 Asia-Pacific 56.9 44.1 110.2 91.7 Americas 32.2 29.5 65.9 58.2 Total Non-U.S. 273.5 248.6 544.6 491.1 Total MA 475.2 422.8 947.2 829.6 Total MCO $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8
Operating Segment [Member]
Segment Reporting Information [Line Items]
Company's Reportable Segment Revenues Disaggregated by Segment and Geographic Region	Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 United States $ 637.9 $ 625.4 $ 1,250.0 $ 1,223.1 Non-U.S.: EMEA 362.7 356.1 695.3 703.4 Asia-Pacific 140.8 123.7 273.0 243.9 Americas 72.2 69.9 137.4 131.4 Total Non-U.S. 575.7 549.7 1,105.7 1,078.7 Total $ 1,213.6 $ 1,175.1 $ 2,355.7 $ 2,301.8

Description of Business and B_3

Description of Business and Basis of Presentation - Adjustment to Retained Earnings (Detail) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	$ 1,213.6			$ 1,175.1		$ 2,355.7	$ 2,301.8
MIS [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	738.4			752.3		1,408.5	1,472.2
MIS [Member] | Corporate finance (CFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	387.4	$ 291.3	$ 307.3	391	$ 389.6	742.8	780.6	$ 1,379.2
MIS [Member] | Structured Finance (SFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	112.1	121.2	114.2	128.2	117.8	212.8	246	481.4
MIS [Member] | As Previously Reported [Member] | Corporate finance (CFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		282.7		377.6	377.7			1,334.1
MIS [Member] | As Previously Reported [Member] | Structured Finance (SFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		129.8	125.4	141.6	129.7			526.5
MIS [Member] | Adoption Adjustment [Member] | Corporate finance (CFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		8.6	11.2	13.4	11.9			45.1
MIS [Member] | Adoption Adjustment [Member] | Structured Finance (SFG) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		(8.6)	(11.2)	(13.4)	(11.9)			(45.1)
MA [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	475.2			422.8		947.2	829.6
MA [Member] | Research, Data And Analytics (RD&A) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	315.3	297.1	280.3	275.9	267.1	623	543	1,120.4
MA [Member] | Enterprise Risk Solutions (ERS) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	$ 117.7	124.1	115.3	109.5	102.2	$ 239.6	$ 211.7	451.1
MA [Member] | As Previously Reported [Member] | Research, Data And Analytics (RD&A) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		302.4	282.6	279.9	269.2			1,134.1
MA [Member] | As Previously Reported [Member] | Enterprise Risk Solutions (ERS) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		118.8	113	105.5	100.1			437.4
MA [Member] | Adoption Adjustment [Member] | Research, Data And Analytics (RD&A) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		(5.3)	(2.3)	(4)	(2.1)			(13.7)
MA [Member] | Adoption Adjustment [Member] | Enterprise Risk Solutions (ERS) [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues		$ 5.3	$ 2.3	$ 4	$ 2.1			$ 13.7

Description of Business and B_4

Description of Business and Basis of Presentation - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)	Jan. 01, 2019USD ($)	Jun. 30, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of Reportable Segments	2
Operating Lease, Right-of-Use Asset	$ 476.8
Operating Lease, Liability, Noncurrent	510.2
Accounting Standards Update 2016-02 (Lease) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 518
Operating Lease, Liability, Noncurrent		622
Deferred Tax Assets		150
Deferred Tax Liabilities		$ 125
Accounting Standards Update 2016-02 (Lease) [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption adjustment Reduction to retained earnings			$ 2.3
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption adjustment Reduction to retained earnings	$ 19.8

Revenues - Revenue by Category

Revenues - Revenue by Category (Detail) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,213.6			$ 1,175.1		$ 2,355.7	$ 2,301.8
Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	(35.2)			(33)		(69.9)	(67.8)
MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	738.4			752.3		1,408.5	1,472.2
MIS [Member] | Operating Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	771.4			782.9		1,473.8	1,532.6
MIS [Member] | Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	33			30.6		65.3	60.4
MIS [Member] | Corporate finance (CFG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	387.4	$ 291.3	$ 307.3	391	$ 389.6	742.8	780.6	$ 1,379.2
MIS [Member] | Corporate finance (CFG) [Member] | Investment-grade [Member]
Disaggregation of Revenue [Line Items]
Revenues	95.8			72.4		193.2	159.6
MIS [Member] | Corporate finance (CFG) [Member] | High-yield [Member]
Disaggregation of Revenue [Line Items]
Revenues	68.2			58.7		125.5	116.6
MIS [Member] | Corporate finance (CFG) [Member] | Bank loans [Member]
Disaggregation of Revenue [Line Items]
Revenues	83.5			121.3		156.1	231.4
MIS [Member] | Corporate finance (CFG) [Member] | Other product lines [Member]
Disaggregation of Revenue [Line Items]
Revenues	139.9			138.6		268	273
MIS [Member] | Structured Finance (SFG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	112.1	121.2	114.2	128.2	117.8	212.8	246	481.4
MIS [Member] | Structured Finance (SFG) [Member] | Assets-backed Securities [Member]
Disaggregation of Revenue [Line Items]
Revenues	25.6			27.9		48.8	56.1
MIS [Member] | Structured Finance (SFG) [Member] | Residential Mortgage-backed Securities Product [Member]
Disaggregation of Revenue [Line Items]
Revenues	24.1			26.8		47.6	51.1
MIS [Member] | Structured Finance (SFG) [Member] | Commercial real estate finance [Member]
Disaggregation of Revenue [Line Items]
Revenues	20.4			18.2		38.1	39.5
MIS [Member] | Structured Finance (SFG) [Member] | Structured credit [Member]
Disaggregation of Revenue [Line Items]
Revenues	41			54.5		76.2	97.9
MIS [Member] | Structured Finance (SFG) [Member] | Other product lines [Member]
Disaggregation of Revenue [Line Items]
Revenues	1			0.8		2.1	1.4
MIS [Member] | Financial institutions (FIG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	125.2			120.6		241	234.9
MIS [Member] | Financial institutions (FIG) [Member] | Banking [Member]
Disaggregation of Revenue [Line Items]
Revenues	84.6			77.3		164.2	154.3
MIS [Member] | Financial institutions (FIG) [Member] | Insurance [Member]
Disaggregation of Revenue [Line Items]
Revenues	28.1			32.9		57.1	61.2
MIS [Member] | Financial institutions (FIG) [Member] | Managed investments [Member]
Disaggregation of Revenue [Line Items]
Revenues	9.5			7.2		13.5	12.9
MIS [Member] | Financial institutions (FIG) [Member] | Other product lines [Member]
Disaggregation of Revenue [Line Items]
Revenues	3			3.2		6.2	6.5
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member]
Disaggregation of Revenue [Line Items]
Revenues	108.6			108.1		201.3	201.3
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | Public finance/sovereign [Member]
Disaggregation of Revenue [Line Items]
Revenues	53			51.7		99.2	98.6
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | Project and infrastructure [Member]
Disaggregation of Revenue [Line Items]
Revenues	55.6			56.4		102.1	102.7
MIS [Member] | Rating Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	733.3			747.9		1,397.9	1,462.8
MIS [Member] | MIS Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.1			4.4		10.6	9.4
MA [Member]
Disaggregation of Revenue [Line Items]
Revenues	475.2			422.8		947.2	829.6
MA [Member] | Operating Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	477.4			425.2		951.8	837
MA [Member] | Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	2.2			2.4		4.6	7.4
MA [Member] | Research, Data And Analytics (RD&A) [Member]
Disaggregation of Revenue [Line Items]
Revenues	315.3	297.1	280.3	275.9	267.1	623	543	1,120.4
MA [Member] | Enterprise Risk Solutions (ERS) [Member]
Disaggregation of Revenue [Line Items]
Revenues	117.7	$ 124.1	$ 115.3	109.5	$ 102.2	239.6	211.7	$ 451.1
MA [Member] | Professional Services (PS) [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 42.2			$ 37.4		$ 84.6	$ 74.9

Revenues - Revenues disaggregat

Revenues - Revenues disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,213.6			$ 1,175.1		$ 2,355.7	$ 2,301.8
U S
Disaggregation of Revenue [Line Items]
Revenues	637.9			625.4		1,250	1,223.1
International [Member]
Disaggregation of Revenue [Line Items]
Revenues	575.7			549.7		1,105.7	1,078.7
MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	738.4			752.3		1,408.5	1,472.2
MIS [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	436.2			451.2		847.4	884.6
MIS [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	302.2			301.1		561.1	587.6
MIS [Member] | Corporate finance (CFG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	387.4	$ 291.3	$ 307.3	391	$ 389.6	742.8	780.6	$ 1,379.2
MIS [Member] | Corporate finance (CFG) [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	242.6			255.2		485.2	512.5
MIS [Member] | Corporate finance (CFG) [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	144.8			135.8		257.6	268.1
MIS [Member] | Structured Finance (SFG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	112.1	121.2	114.2	128.2	117.8	212.8	246	481.4
MIS [Member] | Structured Finance (SFG) [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	71.9			80.4		134.1	154.4
MIS [Member] | Structured Finance (SFG) [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	40.2			47.8		78.7	91.6
MIS [Member] | Financial institutions (FIG) [Member]
Disaggregation of Revenue [Line Items]
Revenues	125.2			120.6		241	234.9
MIS [Member] | Financial institutions (FIG) [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	52.2			54.4		98.2	102.9
MIS [Member] | Financial institutions (FIG) [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	73			66.2		142.8	132
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member]
Disaggregation of Revenue [Line Items]
Revenues	108.6			108.1		201.3	201.3
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	69.4			61.1		129.6	114.5
MIS [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	39.2			47		71.7	86.8
MIS [Member] | Rating Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	733.3			747.9		1,397.9	1,462.8
MIS [Member] | Rating Revenue [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	436.1			451.1		847.1	884.3
MIS [Member] | Rating Revenue [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	297.2			296.8		550.8	578.5
MIS [Member] | MIS Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.1			4.4		10.6	9.4
MIS [Member] | MIS Other [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	0.1			0.1		0.3	0.3
MIS [Member] | MIS Other [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	5			4.3		10.3	9.1
MA [Member]
Disaggregation of Revenue [Line Items]
Revenues	475.2			422.8		947.2	829.6
MA [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	201.7			174.2		402.6	338.5
MA [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	273.5			248.6		544.6	491.1
MA [Member] | Research Data And Analytics [Member]
Disaggregation of Revenue [Line Items]
Revenues	315.3	297.1	280.3	275.9	267.1	623	543	1,120.4
MA [Member] | Research Data And Analytics [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	137.8			118.2		272.6	230.8
MA [Member] | Research Data And Analytics [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	177.5			157.7		350.4	312.2
MA [Member] | Enterprise Risk Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	117.7	$ 124.1	$ 115.3	109.5	$ 102.2	239.6	211.7	$ 451.1
MA [Member] | Enterprise Risk Solutions [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	46.1			42.6		94.5	81.1
MA [Member] | Enterprise Risk Solutions [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	71.6			66.9		145.1	130.6
MA [Member] | Professional Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	42.2			37.4		84.6	74.9
MA [Member] | Professional Services [Member] | U S
Disaggregation of Revenue [Line Items]
Revenues	17.8			13.4		35.5	26.6
MA [Member] | Professional Services [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 24.4			$ 24		$ 49.1	$ 48.3

Revenues - Consolidated Revenue

Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,213.6	$ 1,175.1	$ 2,355.7	$ 2,301.8
MIS [Member]
Segment Reporting Information [Line Items]
Revenues	738.4	752.3	1,408.5	1,472.2
MA [Member]
Segment Reporting Information [Line Items]
Revenues	475.2	422.8	947.2	829.6
U S
Segment Reporting Information [Line Items]
Revenues	637.9	625.4	1,250	1,223.1
U S | MIS [Member]
Segment Reporting Information [Line Items]
Revenues	436.2	451.2	847.4	884.6
U S | MA [Member]
Segment Reporting Information [Line Items]
Revenues	201.7	174.2	402.6	338.5
Non Us [Member]
Segment Reporting Information [Line Items]
Revenues	575.7	549.7	1,105.7	1,078.7
Non Us [Member] | MIS [Member]
Segment Reporting Information [Line Items]
Revenues	302.2	301.1	561.1	587.6
Non Us [Member] | MA [Member]
Segment Reporting Information [Line Items]
Revenues	273.5	248.6	544.6	491.1
Non Us [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Revenues	362.7	356.1	695.3	703.4
Non Us [Member] | EMEA [Member] | MIS [Member]
Segment Reporting Information [Line Items]
Revenues	178.3	181.1	326.8	362.2
Non Us [Member] | EMEA [Member] | MA [Member]
Segment Reporting Information [Line Items]
Revenues	184.4	175	368.5	341.2
Non Us [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	140.8	123.7	273	243.9
Non Us [Member] | Asia Pacific [Member] | MIS [Member]
Segment Reporting Information [Line Items]
Revenues	83.9	79.6	162.8	152.2
Non Us [Member] | Asia Pacific [Member] | MA [Member]
Segment Reporting Information [Line Items]
Revenues	56.9	44.1	110.2	91.7
Non Us [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	72.2	69.9	137.4	131.4
Non Us [Member] | Americas [Member] | MIS [Member]
Segment Reporting Information [Line Items]
Revenues	40	40.4	71.5	73.2
Non Us [Member] | Americas [Member] | MA [Member]
Segment Reporting Information [Line Items]
Revenues	$ 32.2	$ 29.5	$ 65.9	$ 58.2

Revenues - Transaction and Rela

Revenues - Transaction and Relationship Revenue (Detail) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,213.6			$ 1,175.1		$ 2,355.7	$ 2,301.8
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 738.4			$ 752.3		$ 1,408.5	$ 1,472.2
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
MA [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 475.2			$ 422.8		$ 947.2	$ 829.6
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
Corporate finance (CFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 387.4	$ 291.3	$ 307.3	$ 391	$ 389.6	$ 742.8	$ 780.6	$ 1,379.2
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
Structured Finance (SFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 112.1	$ 121.2	$ 114.2	$ 128.2	$ 117.8	$ 212.8	$ 246	$ 481.4
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
Financial institutions (FIG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 125.2			$ 120.6		$ 241	$ 234.9
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
Public, Project And Infrastructure Finance (PPIF) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 108.6			$ 108.1		$ 201.3	$ 201.3
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
MIS Other [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 5.1			$ 4.4		$ 10.6	$ 9.4
Percentage of Revenues	100.00%			100.00%		100.00%	100.00%
Transaction Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 546.8			$ 562.8		$ 1,028.2	$ 1,086.6
Percentage of Revenues	45.00%			48.00%		44.00%	47.00%
Transaction Revenue [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 477.6			$ 495.9		$ 887.5	$ 958.9
Percentage of Revenues	65.00%			66.00%		63.00%	65.00%
Transaction Revenue [Member] | MA [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 69.2			$ 66.9		$ 140.7	$ 127.7
Percentage of Revenues	15.00%			16.00%		15.00%	15.00%
Transaction Revenue [Member] | Corporate finance (CFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 276.4			$ 284.5		$ 525.9	$ 567.9
Percentage of Revenues	71.00%			73.00%		71.00%	73.00%
Transaction Revenue [Member] | Structured Finance (SFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 68.2			$ 85.2		$ 125.5	$ 159.8
Percentage of Revenues	61.00%			66.00%		59.00%	65.00%
Transaction Revenue [Member] | Financial institutions (FIG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 61.2			$ 56.2		$ 109.1	$ 106.2
Percentage of Revenues	49.00%			47.00%		45.00%	11.00%
Transaction Revenue [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 71.4			$ 69.6		$ 126.1	$ 124
Percentage of Revenues	66.00%			64.00%		63.00%	62.00%
Transaction Revenue [Member] | MIS Other [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0.4			$ 0.4		$ 0.9	$ 1
Percentage of Revenues	8.00%			9.00%		8.00%	11.00%
Relationship Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 666.8			$ 612.3		$ 1,327.5	$ 1,215.2
Percentage of Revenues	55.00%			52.00%		56.00%	53.00%
Relationship Revenue [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 260.8			$ 256.4		$ 521	$ 513.3
Percentage of Revenues	35.00%			34.00%		37.00%	35.00%
Relationship Revenue [Member] | MA [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 406			$ 355.9		$ 806.5	$ 701.9
Percentage of Revenues	85.00%			84.00%		85.00%	85.00%
Relationship Revenue [Member] | Corporate finance (CFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 111			$ 106.5		$ 216.9	$ 212.7
Percentage of Revenues	29.00%			27.00%		29.00%	27.00%
Relationship Revenue [Member] | Structured Finance (SFG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 43.9			$ 43		$ 87.3	$ 86.2
Percentage of Revenues	39.00%			34.00%		41.00%	35.00%
Relationship Revenue [Member] | Financial institutions (FIG) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 64			$ 64.4		$ 131.9	$ 128.7
Percentage of Revenues	51.00%			53.00%		55.00%	89.00%
Relationship Revenue [Member] | Public, Project And Infrastructure Finance (PPIF) [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 37.2			$ 38.5		$ 75.2	$ 77.3
Percentage of Revenues	34.00%			36.00%		37.00%	38.00%
Relationship Revenue [Member] | MIS Other [Member] | MIS [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 4.7			$ 4		$ 9.7	$ 8.4
Percentage of Revenues	92.00%			91.00%		92.00%	89.00%

Revenues - Revenue Recognition

Revenues - Revenue Recognition Timing (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	$ 1,213.6	$ 1,175.1	$ 2,355.7	$ 2,301.8
At Point in Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	499.3	509.9	939.6	988.4
Over Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	714.3	665.2	1,416.1	1,313.4
MIS [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	738.4	752.3	1,408.5	1,472.2
MIS [Member] | At Point in Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	477.6	495.9	887.5	958.9
MIS [Member] | Over Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	260.8	256.4	521	513.3
MA [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	475.2	422.8	947.2	829.6
MA [Member] | At Point in Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	21.7	14	52.1	29.5
MA [Member] | Over Time [Member]
Change In Contract with Customer Liability [Abstract]
Revenue Recognized	$ 453.5	$ 408.8	$ 895.1	$ 800.1

Revenues - Schedule of Changes

Revenues - Schedule of Changes in the Deferred Revenue Balances (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Change In Contract with Customer Liability [Abstract]
Total Changes in deferred revenue			$ (8.1)	$ 55.3
Deferred revenue - current	$ 952.3	$ 860.5	952.3	860.5	$ 953.4
Deferred revenue - noncurrent	118.5	126	118.5	126	$ 122.3
Contract with Customer Liability Roll forward [Member]
Change In Contract with Customer Liability [Abstract]
Beginning Balance	1,183.2	1,126.5	1,075.7	946.3
Revenue recognized that was included in the contract liability balance at the beginning of the period	(454)	(432)	(694.1)	(593.1)
Increases due to billings excluding amounts recognized as revenue during the period	346.9	319.5	689.3	648.3
Amount included in liabilities reclassified as held for sale	(2.7)		(2.7)
Effect of exchange rate changes	(2.6)	(27.5)	2.6	(15)
Total Changes in deferred revenue	(112.4)	(140)	(4.9)	40.2
Ending Balance	1,070.8	986.5	1,070.8	986.5
MIS [Member]
Change In Contract with Customer Liability [Abstract]
Deferred revenue - current	261.7	255.9	261.7	255.9
Deferred revenue - noncurrent	114.3	121.6	114.3	121.6
MIS [Member] | Contract with Customer Liability Roll forward [Member]
Change In Contract with Customer Liability [Abstract]
Beginning Balance	388.3	397.5	325.4	334.7
Revenue recognized that was included in the contract liability balance at the beginning of the period	(113.6)	(127.2)	(160.5)	(165.4)
Increases due to billings excluding amounts recognized as revenue during the period	100.9	112.6	210.1	212.6
Effect of exchange rate changes	0.4	(5.4)	1	(4.4)
Total Changes in deferred revenue	(12.3)	(20)	50.6	42.8
Ending Balance	376	377.5	376	377.5
MA [Member]
Change In Contract with Customer Liability [Abstract]
Deferred revenue - current	690.6	604.6	690.6	604.6
Deferred revenue - noncurrent	4.2	4.4	4.2	4.4
MA [Member] | Contract with Customer Liability Roll forward [Member]
Change In Contract with Customer Liability [Abstract]
Beginning Balance	794.9	729	750.3	611.6
Revenue recognized that was included in the contract liability balance at the beginning of the period	(340.4)	(304.8)	(533.6)	(427.7)
Increases due to billings excluding amounts recognized as revenue during the period	246	206.9	479.2	435.7
Amount included in liabilities reclassified as held for sale	(2.7)		(2.7)
Effect of exchange rate changes	(3)	(22.1)	1.6	(10.6)
Total Changes in deferred revenue	(100.1)	(120)	(55.5)	(2.6)
Ending Balance	$ 694.8	$ 609	$ 694.8	$ 609

Revenues - Expected Recognition

Revenues - Expected Recognition Period for Remaining Performance Obligations (Detail) $ in Millions	Jun. 30, 2019USD ($)
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-30
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 144.4
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	0 years
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 23.4
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 68.2
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 37.5
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 6.2
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2034-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 4
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
MIS [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2039-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 5.1
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	4 years
MA [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-06-30
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 1,636
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	0 years
MA [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 1,147.1
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
MA [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 327.7
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
MA [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation	$ 161.2
Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Revenues - Additional Informati

Revenues - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
MIS [Member]
Disaggregation of Revenue [Line Items]
Unbilled Receivables	$ 350.9	$ 311.8
MA [Member]
Disaggregation of Revenue [Line Items]
Unbilled Receivables	$ 48.9	$ 59.5

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation Cost and Associated Tax Benefit (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Stock-based compensation expense	$ 34.2	$ 34.4	$ 69.9	$ 69.5
Tax benefit	$ 7.3	$ 7.3	$ 15.1	$ 14.5

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted Average Assumptions used in Determining Fair Value for Options Granted (Detail)	6 Months Ended
	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	1.15%
Expected stock volatility	23.62%
Risk-free interest rate	2.60%
Expected holding period	6 years 2 months 12 days

Stock-Based Compensation - St_2

Stock-Based Compensation - Stock Option Exercises and Restricted Stock Vesting (Detail) - USD ($) shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Proceeds from stock option exercises	$ 23.4	$ 31.9
Aggregate intrinsic value	82.8	84.4
Tax benefit realized upon exercise	$ 20.2	$ 20.6
Number of shares exercised	0.6	0.7
Restricted Stock [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Fair value of shares vested	$ 149.8	$ 148.7
Tax benefit realized upon vesting	$ 35.5	$ 34.3
Number of shares vested	0.8	0.9
Performance Based Restricted Stock [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Fair value of shares vested	$ 47.5	$ 23
Tax benefit realized upon vesting	$ 11.5	$ 5.5
Number of shares vested	0.3	0.1

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee stock options, granted | shares	0.2
Employee Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period (in years)	4 years
Unrecognized compensation expense | $	$ 9.3
Weighted average period to recognize expense	2 years 1 month 6 days
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Other than options, Shares granted | shares	0.8
Other than options, weighted average grant date fair value | $ / shares	$ 173.67
Award vesting period (in years)	4 years
Unrecognized compensation expense | $	$ 208.4
Weighted average period to recognize expense	2 years 7 months 6 days
Performance Based Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Other than options, Shares granted | shares	0.1
Other than options, weighted average grant date fair value | $ / shares	$ 167.95
Award vesting period (in years)	3 years
Unrecognized compensation expense | $	$ 35.8
Weighted average period to recognize expense	2 years

Income Taxes - Income Taxes Pai

Income Taxes - Income Taxes Paid (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Taxes Paid, Net [Abstract]
Income Taxes Paid	$ 198	$ 237.3

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax - Additional Information [Abstract]
Effective tax rate	28.00%	23.70%	18.80%	19.40%
Overall increase (decrease) in unrecognized tax benefits (UTPs)	$ 5		$ 15.2
Excess Tax Benefit from Share Based Compensation			10.3
Reductions to Tax Positions			2.9
Net of Federal Tax [Member]
Income Tax - Additional Information [Abstract]
Overall increase (decrease) in unrecognized tax benefits (UTPs)	$ 4.8		$ 15.4

Weighted Average Shares Outst_3

Weighted Average Shares Outstanding- Reconciliation of Basic to Diluted Shares Outstanding (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic	189.4	191.9	189.9	191.6
Dilutive effect of shares issuable under stock-based compensation plans	1.9	2.5	2.2	2.9
Diluted	191.3	194.4	192.1	194.5
Anti-dilutive options to purchase common shares and restricted stock as well as contingently issuable restricted stock which are excluded from the table above	0.3	0.5	0.3	0.7

Accelerated Share Repurchase Pr

Accelerated Share Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019	Feb. 20, 2019
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases Payment	$ 500	$ 500
Accelerated Share Repurchases, Final Price Paid Per Share	$ 180.33
Accelerated Share Repurchases [Member]
Accelerated Share Repurchases [Line Items]
Treasury Stock Shares Acquired	2.8
February 20, 2019 [Member] | Accelerated Share Repurchases [Member]
Accelerated Share Repurchases [Line Items]
Treasury Stock Shares Acquired	2.2
April 26, 2019 [Member] | Accelerated Share Repurchases [Member]
Accelerated Share Repurchases [Line Items]
Treasury Stock Shares Acquired	0.6

Cash Equivalent and Investmen_3

Cash Equivalent and Investments (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Fair value	$ 15.1	$ 33.3
Cash and cash equivalents	1,195.9	1,685	$ 1,314.5	$ 1,071.5
Short-term investments	119.5	132.5
Money Market [Member]
Cash and Cash Equivalents [Line Items]
Cost		15.2
Fair value		15.2
Cash and cash equivalents		15.2
Certificates Of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cost	437.5	1,022.4
Fair value	437.5	1,022.4
Cash and cash equivalents	327.4	904.3
Short-term investments	104.5	115.8
Other assets	5.6	2.3
Open Ended Mutual Funds [Member]
Cash and Cash Equivalents [Line Items]
Cost	13.5	29.5
Gross unrealized gains	1.6	3.8
Fair value	15.1	33.3
Short-term investments	15	16.7
Other assets	$ 0.1	$ 16.6

Cash Equivalent and Investmen_4

Cash Equivalent and Investments (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Short Term Investments [Member] | Certificates Of Deposit [Member] | Minimum [Member]
Cash and Cash Equivalents [Line Items]
Securities Maturity period	1 month	1 month
Short Term Investments [Member] | Certificates Of Deposit [Member] | Maximum [Member]
Cash and Cash Equivalents [Line Items]
Securities Maturity period	12 years	12 years
Cash And Cash Equivalents [Member] | Open Ended Mutual Funds [Member] | Maximum [Member]
Cash and Cash Equivalents [Line Items]
Securities Maturity period	90 days
Other Assets [Member] | Certificates Of Deposit [Member] | Minimum [Member]
Cash and Cash Equivalents [Line Items]
Securities Maturity period	13 years	14 years
Other Assets [Member] | Certificates Of Deposit [Member] | Maximum [Member]
Cash and Cash Equivalents [Line Items]
Securities Maturity period	24 years	36 years

Assets And Liabilities Held F_3

Assets And Liabilities Held For Sale - Schedule of Assets and Liabilities Held For Sale (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Current assets:
Impairment of held for sale assets	$ (8,700,000)	$ (8,700,000)
Total assets held for sale	258,100,000	258,100,000
Current liabilities:
Total liabilities held for sale	79,900,000	79,900,000
MAKS [Member]
Current assets:
Cash and cash equivalents	8,000,000	8,000,000
Accounts receivable, net	20,500,000	20,500,000
Other current assets	6,100,000	6,100,000
Total current assets	34,600,000	34,600,000
Property and equipment, net	12,200,000	12,200,000
Goodwill	167,400,000	167,400,000
Intangible Assets	44,100,000	44,100,000
Deferred Tax Assets	5,700,000	5,700,000
Other assets	2,800,000	2,800,000
Total assets held for sale prior to impairment	266,800,000	266,800,000
Impairment of held for sale assets		(8,700,000)
Total assets held for sale	258,100,000	258,100,000
Current liabilities:
Accounts payable and accrued liabilities	16,000,000	16,000,000
Deferred revenue	2,700,000	2,700,000
Total current liabilities	18,700,000	18,700,000
Deferred tax liabilities, net	7,400,000	7,400,000
Uncertain Tax Positions	29,300,000	29,300,000
Other liabilities	24,500,000	24,500,000
Total liabilities held for sale	$ 79,900,000	$ 79,900,000

Assets And Liabilities Held F_4

Assets And Liabilities Held For Sale - Schedule of Impairement of Held for Sale Assets (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Disposal Group Including Discontinued Operation Impairment [Abstract]
Impairment of held for sale assets	$ 8.7	$ 8.7
MAKS [Member]
Disposal Group Including Discontinued Operation Impairment [Abstract]
Total net assets held for sale prior to impairment	186.9	186.9
Currency translation adjustments, net of tax	26.6	26.6
Total net assets held for sale including currency translation adjustment	213.5	213.5
Estimated fair value less costs to sell	$ 204.8	204.8
Impairment of held for sale assets		$ 8.7

Assets And Liabilities Held F_5

Assets And Liabilities Held For Sale - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Assets and Liabilities Held For Sale - Additional Information [Abstract]
Impairment of Long-Lived Assets to be Disposed of	$ 8.7	$ 8.7
MAKS [Member]
Assets and Liabilities Held For Sale - Additional Information [Abstract]
Impairment of Long-Lived Assets to be Disposed of		8.7
Assets Held for Sale Long Lived Fair Value Disclosure	204.8	204.8
Adjustment to Fair Value of Disposal Group Relating to Certain Indemnification Provisions	42	42
Currency translation adjustments, net of tax	$ 26.6	26.6
MAKS [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets and Liabilities Held For Sale - Additional Information [Abstract]
Impairment of Long-Lived Assets to be Disposed of		$ 8.7

Derivative Instruments And He_3

Derivative Instruments And Hedging Activities - Schedule of Interest Rate Swap (Details) - Fair Value Hedge [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative Instrument Detail [Abstract]
Notional amount	$ 1,580	$ 1,330
2010 Senior Notes due 2020 [Member]
Derivative Instrument Detail [Abstract]
Hedged Item	2010 Senior Notes due 2020
Nature of Swap	Pay Floating/Receive Fixed
Notional amount	$ 500	500
Floating Interest Rate	3-month USD LIBOR
2012 Senior Notes due 2022 [Member]
Derivative Instrument Detail [Abstract]
Hedged Item	2012 Senior Notes due 2022
Nature of Swap	Pay Floating/Receive Fixed
Notional amount	$ 330	330
Floating Interest Rate	3-month USD LIBOR
2017 Senior Notes due 2021 [Member]
Derivative Instrument Detail [Abstract]
Hedged Item	2017 Senior Notes due 2021
Nature of Swap	Pay Floating/Receive Fixed
Notional amount	$ 500	$ 500
Floating Interest Rate	3-month USD LIBOR
2017 Notes, due 2023 [Member]
Derivative Instrument Detail [Abstract]
Hedged Item	2017 Senior Notes due 2023
Nature of Swap	Pay Floating/Receive Fixed
Notional amount	$ 250
Floating Interest Rate	3-month USD LIBOR

Derivative Instruments And He_4

Derivative Instruments And Hedging Activities - Summary of Net Gain (Loss) on Interest Rate Swaps Designated in Fair Value Hedge (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary of Fair Value Hedge Activity [Abstract]
Interest expense, net	$ (50.6)	$ (53.4)	$ (103.1)	$ (104.1)
Designated As Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Summary of Fair Value Hedge Activity [Abstract]
Fair value changes on interest rate swaps	19.8	(2.3)	30.6	(11.5)
Fair value changes on hedged debt	(19.8)	2.3	(30.6)	11.5
Designated As Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Expense [Member] | Fair Value hedge Net Interest Settlements and Accruals [Member]
Summary of Fair Value Hedge Activity [Abstract]
Amount of gain (loss) recognized in income	$ 0.1	$ (0.4)	$ (0.1)	$ (0.5)

Derivative Instruments And He_5

Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Cross Currency Swap (Detail) - Currency Swap [Member] - Net Investment Hedging [Member] € in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019EUR (€)	Dec. 31, 2018EUR (€)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
1.51% [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Fixed/Receive Fixed
3-month EURIBOR [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Floating/Receive Floating	Pay Floating/Receive Floating
4.13% [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Fixed/Receive Fixed
3-month U.S. LIBOR [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Floating/Receive Floating	Pay Floating/Receive Floating
Currency Paid [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 2,010.4	€ 710.2
Currency Paid [Member] | 1.51% [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 1,079.1
Weighted Average Fixed Interest Rate	1.43%		1.43%
Currency Paid [Member] | 3-month EURIBOR [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 931.3	€ 710.2
Weighted Average Floating Interest Rate	Based on 3-month EURIBOR	Based on 3-month EURIBOR
Currency Received [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 2,300	$ 830
Currency Received [Member] | 4.13% [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 1,220
Weighted Average Fixed Interest Rate	3.96%		3.96%
Currency Received [Member] | 3-month U.S. LIBOR [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 1,080	$ 830
Weighted Average Floating Interest Rate	Based on 3-month USD LIBOR	Based on 3-month USD LIBOR

Derivative Instruments And He_6

Derivative Instruments And Hedging Activities - Gains (Losses) Recognized in AOCI and Reclassified from AOCI on Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax	$ (29.2)	$ 27.4	$ (5.7)	$ 18
Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(0.1)	0.1	(0.1)	0.2
Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13.5	2.1	21.8	2.1
Net Investment Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax	(29.2)	27.4	(5.7)	16.5
Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13.5	2.1	21.8	2.1
Cash Flow Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax				1.5
Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(0.1)	0.1	(0.1)	0.2
Cross-Currency Swap [Member] | Net Investment Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax	(19.7)	4	(4.5)	4
Gain/(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13.5	2.1	21.8	2.1
Cross-Currency Swap [Member] | Cash Flow Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax				1.5
Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	0	0.1	(0.1)	0.2
Long Term Debt [Member] | Net Investment Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Other Comprehensive Income (Loss), Amount of Gain (Loss) on Derivatives Arising During Period Net of Tax	$ (9.5)	$ 23.4	$ (1.2)	$ 12.5

Derivative Instruments And He_7

Derivative Instruments And Hedging Activities - Gains (Losses) Recognized in AOCI and Reclassified from AOCI on Derivatives (Effective Portion) (Parenthetical) (Detail) - Accounting Standards Update 2018-02 [Member] - Retained Earnings [Member] $ in Millions	Jun. 30, 2019USD ($)
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Effect of adoption adjustment Reduction to retained earnings	$ 19.8
Net Investment Hedging [Member]
Gains and Losses on Derivatives Designated as Hedging Instruments [Abstract]
Effect of adoption adjustment Reduction to retained earnings	$ 2.5

Derivative Instruments And He_8

Derivative Instruments And Hedging Activities - Cumulative Amount of Unrecognized Hedge Losses Recorded in AOCI (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	$ (446.1)	$ (455.5)	$ (426.3)	$ (304.8)	$ (51.9)	$ (172.2)
Designated As Hedging Instrument [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	24.7		32.8
Net Investment Hedging [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	24.5	53.7	32.7	15.2	(12.2)	(1.3)
Net Investment Hedging [Member] | Foreign Exchange Forward [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	23.5		23.5
Net Investment Hedging [Member] | Long-Term Debt [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	(6.8)		(3.1)
Net Investment Hedging [Member] | Cross-Currency Swap [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	7.8		12.3
Cash Flow Hedging [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	0.2	$ 0.1	0.1	$ 2.2	$ 2.3	$ 0.9
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	(2.4)		(2.4)
Cash Flow Hedging [Member] | Cross-Currency Swap [Member]
Cumulative Amount of Unrecognized Hedge Losses Recorded In Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income Loss Net of Tax	$ 2.6		$ 2.5

Derivative Instruments And He_9

Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Foreign Exchange Forwards, Cash Flow Hedging (Detail) € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions	Jun. 30, 2019CAD ($)	Jun. 30, 2019EUR (€)	Jun. 30, 2019GBP (£)	Jun. 30, 2019JPY (¥)	Jun. 30, 2019SGD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018CAD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018JPY (¥)	Dec. 31, 2018USD ($)
Contracts to Sell US Dollars for GBP [Member] | Sell [Member]
Derivative Notional Amount [Abstract]
Notional amount						$ 382.7				$ 310.3
Contracts to Sell US Dollars for GBP [Member] | Buy [Member]
Derivative Notional Amount [Abstract]
Notional amount			£ 299.5					€ 241.2
Contracts to Sell USD for JPY [Member] | Sell [Member]
Derivative Notional Amount [Abstract]
Notional amount						15				14.3
Contracts to Sell USD for JPY [Member] | Buy [Member]
Derivative Notional Amount [Abstract]
Notional amount | ¥				¥ 1,600					¥ 1,600
Contracts to Sell USD for CAD [Member] | Sell [Member]
Derivative Notional Amount [Abstract]
Notional amount						96.8				99
Contracts to Sell USD for CAD [Member] | Buy [Member]
Derivative Notional Amount [Abstract]
Notional amount	$ 130						$ 130
Contracts to Sell US Dollars for Singapore dollars [Member] | Sell [Member]
Derivative Notional Amount [Abstract]
Notional amount						35
Contracts to Sell US Dollars for Singapore dollars [Member] | Buy [Member]
Derivative Notional Amount [Abstract]
Notional amount					$ 48
Contracts to Sell USD for Euros [Member] | Sell [Member]
Derivative Notional Amount [Abstract]
Notional amount						$ 135.8				$ 212.8
Contracts to Sell USD for Euros [Member] | Buy [Member]
Derivative Notional Amount [Abstract]
Notional amount | €		€ 120						€ 184.6

Derivative Instruments And H_10

Derivative Instruments And Hedging Activities - Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Nonoperating (Expense) Income [Member]
Foreign Exchange Forwards Not Designated as Hedging Instruments [Abstract]
Foreign exchange forwards amount of gain (loss) recognized in income	$ (9.9)	$ (44.9)	$ (8.5)	$ (17.3)

Derivative Instruments And H_11

Derivative Instruments And Hedging Activities - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative, Fair Value, Net [Abstract]
Assets	$ 59.1	$ 28.3
Liabilities	581.9	588
Long Term Debt [Member] | Net Investment Hedging [Member]
Derivative, Fair Value, Net [Abstract]
Liabilities	569.4	571.6
Derivatives Designated as Accounting Hedges [Member]
Derivative, Fair Value, Net [Abstract]
Assets	54.1	26.9
Liabilities	10.9	8.2
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivative, Fair Value, Net [Abstract]
Assets	32.8	7.5
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]
Derivative, Fair Value, Net [Abstract]
Liabilities		5.3
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Assets [Member] | Net Investment Hedging [Member]
Derivative, Fair Value, Net [Abstract]
Assets	21.3	19.4
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Noncurrent Liabilities [Member] | Net Investment Hedging [Member]
Derivative, Fair Value, Net [Abstract]
Liabilities	10.9	2.9
Not Designated as Accounting Hedges [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivative, Fair Value, Net [Abstract]
Assets	5	1.4
Not Designated as Accounting Hedges [Member] | Foreign Exchange Forward [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivative, Fair Value, Net [Abstract]
Liabilities	$ 1.6	$ 8.2

Derivative Instruments And H_12

Derivative Instruments And Hedging Activities - Additional Information (Detail) - Derivatives Designated as Accounting Hedges [Member] - Cross-Currency Swap [Member] € in Millions	Jun. 30, 2019EUR (€)
Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount	€ 500
2021 [Member]
Derivative [Line Items]
Notional amount	687.7
2022 [Member]
Derivative [Line Items]
Notional amount	438.2
2023 [Member]
Derivative [Line Items]
Notional amount	441.9
2024 [Member]
Derivative [Line Items]
Notional amount	€ 442.6

Goodwill And Other Acquired I_3

Goodwill And Other Acquired Intangible Assets - Activity in Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Activity In Goodwill [Abstract]
Beginning balance, Goodwill gross	$ 3,793.5	$ 3,765.4
Ending balance, Goodwill gross	3,677.1	3,793.5
Beginning balance, Accumulated impairment charge	(12.2)	(12.2)
Ending balance, Accumulated impairment charge	(12.2)	(12.2)
Beginning balance, goodwill net	3,781.3	3,753.2
Addition/adjustment	43.6	211.5
Foreign currency translation adjustments	7.4	(183.4)
Ending balance, goodwill net	3,664.9	3,781.3
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Activity In Goodwill [Abstract]
Reclassification to assets held-for-sale	(167.4)
MIS [Member]
Activity In Goodwill [Abstract]
Beginning balance, Goodwill gross	257.8	285.2
Ending balance, Goodwill gross	312.7	257.8
Beginning balance, goodwill net	257.8	285.2
Addition/adjustment	43.6
Foreign currency translation adjustments	11.3	(27.4)
Ending balance, goodwill net	312.7	257.8
MA [Member]
Activity In Goodwill [Abstract]
Beginning balance, Goodwill gross	3,535.7	3,480.2
Ending balance, Goodwill gross	3,364.4	3,535.7
Beginning balance, Accumulated impairment charge	(12.2)	(12.2)
Ending balance, Accumulated impairment charge	(12.2)	(12.2)
Beginning balance, goodwill net	3,523.5	3,468
Addition/adjustment		211.5
Foreign currency translation adjustments	(3.9)	(156)
Ending balance, goodwill net	3,352.2	$ 3,523.5
MA [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Activity In Goodwill [Abstract]
Reclassification to assets held-for-sale	$ (167.4)

Goodwill And Other Acquired I_4

Goodwill And Other Acquired Intangible Assets - Acquired Intangible Assets and Related Amortization (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, net	$ 1,486	$ 1,566.1
Customer Relationships [Member]
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, gross	1,284.3	1,367.5
Accumulated amortization	(206)	(214.2)
Acquired intangible assets, net	1,078.3	1,153.3
Trade Secrets [Member]
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, gross	30	29.8
Accumulated amortization	(28.5)	(28.2)
Acquired intangible assets, net	1.5	1.6
Computer Software Intangible Asset [Member]
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, gross	353.2	353.3
Accumulated amortization	(115)	(101.8)
Acquired intangible assets, net	238.2	251.5
Trade Names [Member]
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, gross	146	155.1
Accumulated amortization	(26.8)	(34.1)
Acquired intangible assets, net	119.2	121
Other Intangible Assets [Member]
Intangible Assets and Related Amortization [Abstract]
Acquired intangible assets, gross	78.5	70.4
Accumulated amortization	(29.7)	(31.7)
Acquired intangible assets, net	$ 48.8	$ 38.7

Goodwill And Other Acquired I_5

Goodwill And Other Acquired Intangible Assets - Amortization Expense Relating to Acquired Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amortization Expense Relating to Acquired Intangible Assets [Abstract]
Amortization expense	$ 26.2	$ 25.1	$ 52.6	$ 50.8

Goodwill And Other Acquired I_6

Goodwill And Other Acquired Intangible Assets - Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization (Detail) $ in Millions	Jun. 30, 2019USD ($)
Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization [Abstract]
2019 (after June 30)	$ 48.5
2020	95.9
2021	95.7
2022	95.7
2023	92.6
Thereafter	1,057.6
Total estimated future amortization	$ 1,486

Restructuring - Restructuring E

Restructuring - Restructuring Expenses Included in Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Restructuring [Abstract]
Restructuring	$ 53.8	$ 59.3

Restructuring - Changes in Rest

Restructuring - Changes in Restructuring Liability (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning Balance	$ 42.3
Adoption of New Lease Accounting Standard	(10.9)
Costs incurred and adjustments	30.4
Cash payments and adjustments	(21.7)
Restructuring liability, Ending Balance	40.1
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning Balance	29.9
Costs incurred and adjustments	26.1
Cash payments and adjustments	(19.1)
Restructuring liability, Ending Balance	36.9
Cumulative expense incurred to date	59
Contract Termination Cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability, Beginning Balance	12.4
Adoption of New Lease Accounting Standard	(10.9)
Costs incurred and adjustments	4.3
Cash payments and adjustments	(2.6)
Restructuring liability, Ending Balance	3.2
Cumulative expense incurred to date	$ 49

Restructuring - Changes in Re_2

Restructuring - Changes in Restructuring Liability (Parenthetical) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Restructuring Cost and Reserve [Line Items]
Reclassification of Liabilities as a reduction of the ROU Asset capitalized upon adoption	$ (10.9)
Impairment of right-of-use	24.8
Operating lease right-of-use assets	476.8
Accounting Standards Update 2016-02 (Lease) [Member]
Restructuring Cost and Reserve [Line Items]
Operating lease right-of-use assets		$ 518
Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of right-of-use	24.8
Real Estate [Member] | Level 3 [Member]
Restructuring Cost and Reserve [Line Items]
Operating lease right-of-use assets	17.7
Contract Termination Cost [Member]
Restructuring Cost and Reserve [Line Items]
Reclassification of Liabilities as a reduction of the ROU Asset capitalized upon adoption	(10.9)
Contract Termination Cost [Member] | Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash acceleration of amortization	4.1
Contract Termination Cost [Member] | Real Estate [Member] | Accounting Standards Update 2016-02 (Lease) [Member]
Restructuring Cost and Reserve [Line Items]
Reclassification of Liabilities as a reduction of the ROU Asset capitalized upon adoption	$ 10.9

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($) $ in Millions	Oct. 26, 2018	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Remaining restructuring liability		$ 40.1	$ 40.1	$ 42.3
Payments for Restructuring			21.7
Costs incurred and adjustments			30.4
Restructuring charges		$ 53.8	$ 59.3
2018 Restructuring Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expected Cost	$ 105
Effect on Future Earnings, Amount	60
2018 Restructuring Program [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expected Cost	110
2018 Restructuring Program [Member] | Employee Severance [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expected Cost	60
2018 Restructuring Program [Member] | Employee Severance [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	50
2018 Restructuring Program [Member] | Real Estate [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Expected Cost	$ 60

Fair Value - Financial Instrume

Fair Value - Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets:
Derivative Contracts	$ 59.1	$ 28.3
Money market funds		15.2
Fair value	15.1	33.3
Total, Assets	74.2	76.8
Liabilities:
Derivatives, Liabilities	12.5	16.4
Total, Liabilities	12.5	16.4
Level 1 [Member]
Assets:
Money market funds		15.2
Fair value	15.1	33.3
Total, Assets	15.1	48.5
Level 2 [Member]
Assets:
Derivative Contracts	59.1	28.3
Total, Assets	59.1	28.3
Liabilities:
Derivatives, Liabilities	12.5	16.4
Total, Liabilities	$ 12.5	$ 16.4

Other Balance Sheet and State_3

Other Balance Sheet and Statement of Operations Information - Additional Details Related to Certain Balance Sheet Captions (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Other current assets:
Prepaid taxes	$ 147,700,000	$ 100,100,000
Prepaid expenses	86,200,000	102,000,000
Capitalized costs to obtain and fulfill sales contracts	73,400,000	77,200,000
Other	28,500,000	3,000,000
Total other current assets	335,800,000	282,300,000
Other assets
Investments in joint ventures	121,400,000	104,600,000
Deposits for real-estate leases	14,600,000	13,500,000
Indemnification assets related to acquisitions	16,200,000	16,100,000
Mutual funds and fixed deposits	5,700,000	18,900,000
Costs to obtain sales contracts	89,100,000	78,000,000
Interest rate swaps	54,100,000	26,900,000
Other	16,400,000	16,300,000
Total other assets	317,500,000	274,300,000
Accounts payable and accrued liabilities
Salaries and benefits	101,900,000	112,500,000
Incentive compensation	95,900,000	154,500,000
Customer credits, advanced payments and advanced billings	21,300,000	20,400,000
Self-insurance reserves	11,400,000	10,600,000
Dividends	5,000,000	6,500,000
Professional service fees	57,900,000	47,700,000
Interest accrued on debt	66,200,000	70,500,000
Accounts payable	4,900,000	30,100,000
Income taxes	75,100,000	71,400,000
Pension and other post retirement employee benefits	6,500,000	6,400,000
Accrued royalties	13,300,000	25,100,000
Foreign exchange forwards on certain assets and liabilities	1,600,000	8,200,000
Restructuring liability	34,300,000	35,500,000
Other	93,400,000	95,800,000
Total accounts payable and accrued liabilities	588,700,000	695,200,000
Other liabilities
Pension and other post retirement employee benefits	265,900,000	249,200,000
Deferred rent-non-current portion		94,300,000
Interest accrued on UTPs	69,800,000	69,600,000
Income tax liability - non-current	125,300,000	125,300,000
Interest rate swaps	10,900,000	8,200,000
Restructuring liability	5,800,000	6,800,000
Other	13,800,000	23,100,000
Total other liabilities	$ 491,500,000	$ 576,500,000

Other Balance Sheet and State_4

Other Balance Sheet and Statement of Operations Information - Other Non-Operating Interest (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]
FX gain/(loss)	$ (9.4)	$ 6.2	$ (15.6)	$ 0.3
Net periodic pension costs - other components	4.4	2.9	8.9	5.2
Joint venture income	5.6	4.6	6.8	5.9
Other	(0.2)	1.2	2.6	4.5
Total	$ 0.4	$ 14.9	$ 2.7	$ 15.9

Comprehensive Income And Accu_3

Comprehensive Income And Accumulated Other Comprehensive Income - Reclassification out of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax	$ (0.1)	$ 0.1	$ (0.1)	$ 0.2
Gains on cash flow hedges - Tax
Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(0.1)	0.1	(0.1)	0.2
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(0.8)	(1)	(1.6)	(2.4)
Amortization of actuarial losses and prior service costs included in net income - Tax	0.2	0.3	0.4	0.7
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	(0.6)	(0.7)	(1.2)	(1.7)
(Losses) Income Attributable to Reclassification Out Of AOCI Net Of Tax	(0.7)	(0.6)	(1.3)	(1.5)
Operating Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(0.5)	(0.7)	(1)	(1.6)
SG&A Expense [Member]
Pension and Other Post-Retirement Benefits, net of tax:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	(0.3)	(0.3)	(0.6)	(0.8)
Interest Rate Swap [Member] | Interest Expense [Member]
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax	$ (0.1)		0
Currency Swap [Member] | Interest Expense [Member]
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax		$ 0.1		$ 0.2
Currency Swap [Member] | Other Nonoperating Income (Expense) [Member]
Cash Flow Hedges, net of tax:
Gains on cash flow hedges - Pre Tax			$ (0.1)

Comprehensive Income And Accu_4

Comprehensive Income And Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance	$ (455.5)	$ (51.9)	$ (426.3)	$ (172.2)
Pension and other retirement benefit plans before reclassification - Net of Tax	(2.1)	1.2	(1.3)	1.2
Reclassification adjustment from AOCI, Pension and Other Postretirement Benefit Plans - Net of Tax	0.6	0.7	1.2	1.7
Pension and other retirement benefit - Net of Tax	(1.5)	1.9	(17.4)	2.9
Net unrealized gain (losses) on cash flow before reclassification - Net of Tax				1.5
Reclassification of losses included in net income- Net of Tax	0.1	(0.1)	0.1	(0.2)
Net unrealized gain (losses) on cash flow - Net of Tax	0.1	(0.1)	0.1	1.3
Foreign currency translation adjustments before reclassification - Net of Tax	41.6	(286.9)	14.9	(150.8)
Foreign currency translation adjustments - Net of Tax	(29.2)	27.4	(5.7)	16.5
Gains on Available for sale securities - Net of Tax				(2.3)
Amounts reclassified from AOCI	0.7	0.6	1.3	1.5
Total other comprehensive (loss) income - Net of Tax	11	(257.7)	9.2	(130.1)
Ending Balance	(446.1)	(304.8)	(446.1)	(304.8)
Parent [Member]
Accumulated Other Comprehensive Income [Abstract]
Foreign currency translation adjustments before reclassification - Net of Tax	40	(282.1)	5.7	(151)
Foreign currency translation adjustments - Net of Tax	40	(282.1)	5.7	16.5
Other comprehensive income/(loss) before reclassifications	8.7	(253.5)	(1.3)	(131.8)
Amounts reclassified from AOCI		0.6		1.5
Total other comprehensive (loss) income - Net of Tax	9.4	(252.9)	(19.8)	(132.6)
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income [Abstract]
Reclassification adjustment from AOCI, Pension and Other Postretirement Benefit Plans - Net of Tax			(17.3)
Amount reclassified from AOCI, Foreign Currency Translation Adjustment - Net of Tax			(2.5)
Amounts reclassified from AOCI			(19.8)
Financial Instruments - Overall (ASU 2016-01) [Member]
Accumulated Other Comprehensive Income [Abstract]
Gains on Available for sale securities - Net of Tax				(2.3)
Other comprehensive income/(loss) before reclassifications				(2.3)
Pension and Other Retirement Benefits [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance	(69)	(60.5)	(53.1)	(61.5)
Ending Balance	(70.5)	(58.6)	(70.5)	(58.6)
Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance	0.1	2.3	0.1	0.9
Ending Balance	0.2	2.2	0.2	2.2
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance	(440.3)	18.5	(406)	(112.6)
Ending Balance	(400.3)	(263.6)	(400.3)	(263.6)
Gains on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance				2.3
Net Investment Hedging [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning Balance	53.7	(12.2)	32.7	(1.3)
Foreign currency translation adjustments before reclassification - Net of Tax	(29.2)	27.4	(5.7)
Foreign currency translation adjustments - Net of Tax	(29.2)	27.4	(8.2)
Ending Balance	$ 24.5	$ 15.2	$ 24.5	$ 15.2

Pension and Other Post-Retire_3

Pension and Other Post-Retirement Benefits - Components of Net Periodic Benefit Expense Related to Post-Retirement Plans (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Net Periodic Benefit Cost [Asbtract]
Interest cost	$ 5.6	$ 4.9	$ 11.2	$ 9.6
Pension Plans [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Asbtract]
Service cost	4	4.6	8.3	9.4
Interest cost	5.2	4.4	10.3	8.8
Expected return on plan assets	(5.1)	(3.8)	(10.1)	(7.6)
Amortization of net actuarial loss from earlier periods	1	1.5	1.9	3.1
Amortization of net prior service costs from earlier periods	(0.1)	(0.1)	(0.2)	(0.2)
Net periodic expense	5	6.6	10.2	13.5
Other Retirement Plans [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Asbtract]
Service cost	0.7	0.8	1.4	1.5
Interest cost	0.3	0.2	0.6	0.5
Amortization of net prior service costs from earlier periods			(0.1)	(0.1)
Net periodic expense	$ 1	$ 1	$ 1.9	$ 1.9

Pension and Other Post-Retire_4

Pension and Other Post-Retirement Benefits - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Unfunded Pension Plans [Member]
Pension and Other Post-Retirement Benefits - Additional Information [Abstract]
Defined benefit payment amount	$ 3
Estimated additional payments in 2019	3.6
Other Postretirement Benefit Plans Defined Benefit [Member]
Pension and Other Post-Retirement Benefits - Additional Information [Abstract]
Defined benefit payment amount	0.1
Estimated additional payments in 2019	$ 1

Indebtedness - Summary of Total

Indebtedness - Summary of Total Indebtedness (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Summary of Total Indebtedness [Abstract]
Principal Amount	$ 5,399.4	$ 5,721.6
Fair Value of Interest Rate Swap	32.8	2.2
Unamortized (Discount) Premium	(16.1)	(17.3)
Unamortized Debt Issuance Costs	(28.2)	(30.5)
Total Debt	5,387.9
Current portion	(129.9)
Carrying Amount	5,258	5,676
Current portion of long-term debt		(449.9)
Total long-term debt, non-current	5,258	5,226.1
Commercial Paper [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	130
Unamortized (Discount) Premium	(0.1)
Total Debt	129.9
5.50% 2010 Senior Notes, due 2020 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Fair Value of Interest Rate Swap	2.3	(3.7)
Unamortized (Discount) Premium	(0.5)	(0.6)
Unamortized Debt Issuance Costs	(0.5)	(0.7)
Carrying Amount	501.3	495
4.50% 2012 Senior Notes, due 2022 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Fair Value of Interest Rate Swap	10.1	1.9
Unamortized (Discount) Premium	(1.4)	(1.6)
Unamortized Debt Issuance Costs	(1.2)	(1.4)
Carrying Amount	507.5	498.9
4.875% 2013 Senior Notes, due 2024 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Unamortized (Discount) Premium	(1.4)	(1.5)
Unamortized Debt Issuance Costs	(1.8)	(2)
Carrying Amount	496.8	496.5
2.75% 2014 Senior Notes (5-Year), due 2019 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount		450
Unamortized (Discount) Premium		(0.1)
Carrying Amount		449.9
5.25% 2014 Senior Notes (30-Year), due 2044 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	600	600
Unamortized (Discount) Premium	3.2	3.2
Unamortized Debt Issuance Costs	(5.4)	(5.5)
Carrying Amount	597.8	597.7
1.75% 2015 Senior Notes, due 2027 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	569.4	571.6
Unamortized Debt Issuance Costs	(2.9)	(3.1)
Carrying Amount	566.5	568.5
2.75% 2017 Senior Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Fair Value of Interest Rate Swap	13.1	4
Unamortized (Discount) Premium	(0.8)	(1)
Unamortized Debt Issuance Costs	(2)	(2.4)
Carrying Amount	510.3	500.6
2.625% 2017 Notes, due 2023 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Fair Value of Interest Rate Swap	7.3
Unamortized (Discount) Premium	(0.8)	(0.9)
Unamortized Debt Issuance Costs	(2.6)	(2.8)
Carrying Amount	503.9	496.3
3.25% 2017 Notes, due 2028 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	500	500
Unamortized (Discount) Premium	(4.5)	(4.7)
Unamortized Debt Issuance Costs	(3.5)	(3.7)
Carrying Amount	492	491.6
3.25% 2018 Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	300	300
Unamortized (Discount) Premium	(0.3)	(0.4)
Unamortized Debt Issuance Costs	(1.2)	(1.5)
Carrying Amount	298.5	298.1
4.25% 2018 Notes, due 2029 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	400	400
Unamortized (Discount) Premium	(2.9)	(3)
Unamortized Debt Issuance Costs	(3.1)	(3.3)
Carrying Amount	394	393.7
4.875% 2018 Notes, due 2048 [Member]
Summary of Total Indebtedness [Abstract]
Principal Amount	400	400
Unamortized (Discount) Premium	(6.6)	(6.7)
Unamortized Debt Issuance Costs	(4)	(4.1)
Carrying Amount	$ 389.4	$ 389.2

Indebtedness - Summary of Tot_2

Indebtedness - Summary of Total Indebtedness (Parenthetical) (Detail)	Jun. 30, 2019	Dec. 31, 2018
5.50% 2010 Senior Notes, due 2020 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	5.50%	5.50%
4.50% 2012 Senior Notes, due 2022 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	4.50%	4.50%
4.875% 2013 Senior Notes, due 2024 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	4.875%	4.875%
2.75% 2014 Senior Notes (5-Year), due 2019 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate		2.75%
5.25% 2014 Senior Notes (30-Year), due 2044 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	5.25%	5.25%
1.75% 2015 Senior Notes, due 2027 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	1.75%	1.75%
2.75% 2017 Senior Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	2.75%	2.75%
2.625% 2017 Notes, due 2023 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	2.625%	2.625%
3.25% 2017 Notes, due 2028 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	3.25%	3.25%
3.25% 2018 Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	3.25%	3.25%
4.25% 2018 Notes, due 2029 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	4.25%	4.25%
4.875% 2018 Notes, due 2048 [Member]
Summary of Total Indebtedness [Abstract]
Notes Payable, interest rate	4.875%	4.875%

Indebtedness - Principal Paymen

Indebtedness - Principal Payments Due on Long-Term Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Principal Payments Due on Long Term Borrowings [Abstract]
2019 (after June 30,)	$ 130
2020	500
2021	800
2022	500
2023	500
Thereafter	2,969.4
Total principal payment	5,399.4	$ 5,721.6
Commercial Paper [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2019 (after June 30,)	130
Total principal payment	130
2010 Senior Notes due 2020 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2020	500
Total principal payment	500	500
2012 Senior Notes due 2022 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2022	500
Total principal payment	500	500
2013 Senior Notes [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	500
Total principal payment	500	500
2014 Senior Notes (5-Year) [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Total principal payment		450
2014 Senior Notes (30-Year) [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	600
Total principal payment	600	600
2015 Senior Notes [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	569.4
Total principal payment	569.4	571.6
2.75% 2017 Senior Notes, due 2021 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2021	500
Total principal payment	500	500
2.625% 2017 Notes, due 2023 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2023	500
Total principal payment	500	500
3.25% 2017 Notes, due 2028 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	500
Total principal payment	500	500
3.25% 2018 Notes, due 2021 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
2021	300
Total principal payment	300	300
4.25% 2018 Notes, due 2029 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	400
Total principal payment	400	400
4.875% 2018 Notes, due 2048 [Member]
Principal Payments Due on Long Term Borrowings [Abstract]
Thereafter	400
Total principal payment	$ 400	$ 400

Indebtedness - Summary of Compo

Indebtedness - Summary of Components of Interest as Presented in Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Indebtedness [Abstract]
Income	$ 3.9	$ 3.4	$ 8.9	$ 6.6
Expense on borrowings	(41.7)	(49.4)	(88.3)	(100.7)
Income (expense) on UTPs and other tax related liabilities	(7.6)	(2.8)	(13.2)	(1)
Net periodic pension costs - interest component	(5.6)	(4.9)	(11.2)	(9.6)
Capitalized	0.4	0.3	0.7	0.6
Total	$ (50.6)	$ (53.4)	$ (103.1)	$ (104.1)

Indebtedness - Interest Paid (D

Indebtedness - Interest Paid (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Interest Paid [Abstract]
Interest paid	$ 97.7	$ 102.5

Indebtedness - Fair Value and C

Indebtedness - Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	$ 5,258	$ 5,676
Estimated Fair Value	5,638.1	5,782.5
5.50% 2010 Senior Notes, due 2020 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	501.3	495
Estimated Fair Value	517.8	517.7
4.50% 2012 Senior Notes, due 2022 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	507.5	498.9
Estimated Fair Value	529.4	513.7
4.875% 2013 Senior Notes, due 2024 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	496.8	496.5
Estimated Fair Value	547.4	522.4
2.75% 2014 Senior Notes (5-Year), due 2019 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt		449.9
Estimated Fair Value		449.9
5.25% 2014 Senior Notes (30-Year), due 2044 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	597.8	597.7
Estimated Fair Value	713.4	638.1
1.75% 2015 Senior Notes, due 2027 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	566.5	568.5
Estimated Fair Value	615.7	585.3
2.75% 2017 Senior Notes, due 2021 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	510.3	500.6
Estimated Fair Value	504.5	489.7
2.625% 2017 Notes, due 2023 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	503.9	496.3
Estimated Fair Value	501.2	476.9
3.25% 2017 Notes, due 2028 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	492	491.6
Estimated Fair Value	506.3	472.8
3.25% 2018 Notes, due 2021 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	298.5	298.1
Estimated Fair Value	305	298.6
4.25% 2018 Notes, due 2029 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	394	393.7
Estimated Fair Value	436.4	407.6
4.875% 2018 Notes, due 2048 [Member]
Fair Value and Carrying Value of Long-Term Debt [Abstract]
Long term debt	389.4	389.2
Estimated Fair Value	$ 461	$ 409.8

Indebtedness - Fair Value and_2

Indebtedness - Fair Value and Carrying Value of Long-Term Debt (Parenthetical) (Detail)	Jun. 30, 2019	Dec. 31, 2018
5.50% 2010 Senior Notes, due 2020 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	5.50%	5.50%
4.50% 2012 Senior Notes, due 2022 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	4.50%	4.50%
4.875% 2013 Senior Notes, due 2024 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	4.875%	4.875%
2.75% 2014 Senior Notes (5-Year), due 2019 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage		2.75%
5.25% 2014 Senior Notes (30-Year), due 2044 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	5.25%	5.25%
1.75% 2015 Senior Notes, due 2027 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	1.75%	1.75%
2.75% 2017 Senior Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	2.75%	2.75%
2.625% 2017 Notes, due 2023 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	2.625%	2.625%
3.25% 2017 Notes, due 2028 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	3.25%	3.25%
3.25% 2018 Notes, due 2021 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	3.25%	3.25%
4.25% 2018 Notes, due 2029 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	4.25%	4.25%
4.875% 2018 Notes, due 2048 [Member]
Summary of Total Indebtedness [Abstract]
Debt Instrument Interest Rate Stated Percentage	4.875%	4.875%

Indebtedness - Additional Infor

Indebtedness - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt, aggregate principal amount	$ 5,399.4	$ 5,721.6
Commercial Paper	$ 129.9
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper, interest rate	2.65%
Maturity Date	12 days
Commercial Paper [Member] | Date of Issuance [Member]
Debt Instrument [Line Items]
Maturity Date	21 days
2014 Senior Notes (5-Year) [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 450

Leases - Components of Lease Co

Leases - Components of Lease Cost (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 24.5	$ 49.1
Short-term lease cost		0.4
Variable least cost	4.1	7.7
Total lease cost	$ 28.6	$ 57.2

Leases - Operating Leases Infor

Leases - Operating Leases Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Operating Leases Information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 27	$ 53.2
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 6.9	$ 15.9
Weighted-average remaining lease term	7 years 3 months 18 days	7 years 3 months 18 days
Weighted-average discount rate applied to operating leases	3.60%	3.60%

Leases - Operating Leases, Futu

Leases - Operating Leases, Future Minimum Payment (Detail) $ in Millions	Jun. 30, 2019USD ($)
Operating Leases, Future Minimum Payment [Abstract]
2019 (After June 30)	$ 54.8
2020	106.9
2021	100.5
2022	87.2
2023	81.7
Thereafter	248.1
Total minimum lease payments	679.2
Less: Interest	79.9
Present value of lease liabilities:	599.3
Lease liabilities - current	89.1
Lease liabilities - noncurrent	$ 510.2

Leases - Additional Information

Leases - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Operating Leased Assets [Line Items]
Impairment of right-of-use	$ 24.8
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Renewal Term	20 years

Contingencies - Additional Info

Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Contingencies [Abstract]
Unsupported Allegations of Minimum Underpaid Taxes	$ 120

Segment Information - Financial

Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financial Information by Segment [Abstract]
Revenues	$ 1,213.6	$ 1,175.1	$ 2,355.7	$ 2,301.8
Operating, SG&A	614.6	590.7	1,237.8	1,176.7
Adjusted Operating Income	599	584.4	1,117.9	1,125.1
Depreciation and amortization	51	48.4	101.3	97.5
Restructuring Charges	53.8		59.3
Acquisition-Related Expenses	2	2	3.4	2.8
Long-lived asset impairment pursuant to the divestiture of MAKS	8.7		8.7
Operating Income	483.5	534	945.2	1,024.8
Eliminations [Member]
Financial Information by Segment [Abstract]
Revenues	(35.2)	(33)	(69.9)	(67.8)
Operating, SG&A	(35.2)	(33)	(69.9)	(67.8)
MIS [Member]
Financial Information by Segment [Abstract]
Revenues	738.4	752.3	1,408.5	1,472.2
MIS [Member] | Operating Segment [Member]
Financial Information by Segment [Abstract]
Revenues	771.4	782.9	1,473.8	1,532.6
Operating, SG&A	307	303.6	623.8	614
Adjusted Operating Income	464.4	479.3	850	918.6
Depreciation and amortization	18	16.7	35	33.5
Restructuring Charges	26.5		29.2
Operating Income	419.9	462.6	785.8	885.1
MA [Member]
Financial Information by Segment [Abstract]
Revenues	475.2	422.8	947.2	829.6
MA [Member] | Operating Segment [Member]
Financial Information by Segment [Abstract]
Revenues	477.4	425.2	951.8	837
Operating, SG&A	342.8	320.1	683.9	630.5
Adjusted Operating Income	134.6	105.1	267.9	206.5
Depreciation and amortization	33	31.7	66.3	64
Restructuring Charges	27.3		30.1
Acquisition-Related Expenses	2	2	3.4	2.8
Long-lived asset impairment pursuant to the divestiture of MAKS	8.7		8.7
Operating Income	$ 63.6	$ 71.4	$ 159.4	$ 139.7

Segment Information - Consolida

Segment Information - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segments Geographical Areas [Abstract]
Revenues	$ 1,213.6	$ 1,175.1	$ 2,355.7	$ 2,301.8
United States [Member]
Segments Geographical Areas [Abstract]
Revenues	637.9	625.4	1,250	1,223.1
International [Member]
Segments Geographical Areas [Abstract]
Revenues	575.7	549.7	1,105.7	1,078.7
International [Member] | EMEA [Member]
Segments Geographical Areas [Abstract]
Revenues	362.7	356.1	695.3	703.4
International [Member] | Asia Pacific [Member]
Segments Geographical Areas [Abstract]
Revenues	140.8	123.7	273	243.9
International [Member] | Americas [Member]
Segments Geographical Areas [Abstract]
Revenues	$ 72.2	$ 69.9	$ 137.4	$ 131.4

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)	Oct. 26, 2018USD ($)
Segment Reporting Information [Line Items]
Operating Segments	2
2018 Restructuring Program [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Restructuring Expected Cost		$ 105
2018 Restructuring Program [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Restructuring Expected Cost		$ 110
2018 Restructuring Program [Member] | Moodys Investors Service [Member]
Segment Reporting Information [Line Items]
Cumulative expense incurred to date	$ 61.4
2018 Restructuring Program [Member] | Moodys Analytics [Member]
Segment Reporting Information [Line Items]
Cumulative expense incurred to date	$ 46.6

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]	Jul. 09, 2019$ / shares
Subsequent Event [Line Items]
Dividend declared, per share	$ 0.50
Dividend declared, declaration date	Jul. 9, 2019
Dividend declared, payable date	Sep. 10, 2019
Dividend declared, record date	Aug. 20, 2019