SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2018

Segment Information [Abstract]

Financial Information by Segment

			Year Ended December 31,
			2018								2017
			MIS		MA		Eliminations		Consolidated		MIS(1)		MA(1)		Eliminations		Consolidated(1)
Revenue			$	2,836.4	$	1,742.6	$	(136.3)	$	4,442.7	$	2,885.5	$	1,446.3	$	(127.7)	$	4,204.1
Operating, SG&A				1,179.0		1,282.9		(136.3)		2,325.6		1,239.3		1,090.9		(127.7)		2,202.5
	Adjusted Operating Income			1,657.4		459.7		-		2,117.1		1,646.2		355.4		-		2,001.6
	Less:
	Depreciation and amortization			64.9		127.0		-		191.9		74.7		83.6		-		158.3
	Restructuring			32.2		16.5		-		48.7		-		-		-		-
	Acquisition-Related Expenses			-		8.3		-		8.3		-		22.5		-		22.5
Operating income			$	1,560.3	$	307.9	$	-	$	1,868.2	$	1,571.5	$	249.3	$	-	$	1,820.8
											2016
											MIS(1)		MA(1)		Eliminations		Consolidated(1)
Revenue											$	2,471.0	$	1,246.9	$	(113.7)	$	3,604.2
Operating, SG&A												1,107.8		956.7		(113.7)		1,950.8
	Adjusted Operating Income											1,363.2		290.2		-		1,653.4
	Less:
	Depreciation and amortization											73.8		52.9		-		126.7
	Restructuring											10.2		1.8		-		12.0
	Settlement Charge											863.8		-		-		863.8
Operating income											$	415.4	$	235.5	$	-	$	650.9
		(1) Pursuant to the adoption of a new accounting standard relating to pension accounting as more fully discussed in Note 1, only the service cost component of net periodic pension expense will be classified within operating and SG&A expenses with the remaining components being classified as non-operating expenses. Prior period segment results have been restated to reflect this reclassification. Accordingly, operating and SG&A expenses for MIS and MA were reduced by $7.6 million and $4.1 million, respectively, for the year ended December 31, 2017. For the year ended December 31, 2016, operating and SG&A expenses for MIS and MA were reduced by $7.8 million and $4.4 million, respectively.

Consolidated Revenue and Long-Lived Assets Information by Geographic Area

		Year Ended December 31,
		2018		2017		2016
Revenue:
U.S.		$	2,329.6		2,348.4	$	2,105.5
Non-U.S.:
	EMEA		1,377.0		1,131.7		904.4
	Asia-Pacific		493.2		471.4		373.2
	Americas		242.9		252.6		221.1
	Total Non-U.S.		2,113.1		1,855.7		1,498.7
Total		$	4,442.7	$	4,204.1	$	3,604.2
Long-lived assets at December 31:
U.S.		$	982.4	$	672.5	$	681.9
Non-U.S.			4,685.4		5,037.4		964.0
Total		$	5,667.8	$	5,709.9	$	1,645.9