Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Financial Information By Segment

	Three Months Ended March 31,
	2012									2011
	MIS		MA		Eliminations			Consolidated		MIS		MA		Eliminations			Consolidated
Revenue	$	469.8	$	197.1	$	(20.1	)	$	646.8	$	428.6	$	167.1	$	(18.6	)	$	577.1
Expenses:
Operating, SG&A		220.9		153.5		(20.1	)		354.3		200.6		127.3		(18.6	)		309.3
Restructuring		—		—					—		—		—		—			—
Depreciation and amortization		11.2		12.3					23.5		8.7		9.0		—			17.7
Total		232.1		165.8		(20.1	)		377.8		209.3		136.3		(18.6	)		327.0
Operating income	$	237.7	$	31.3	$	—		$	269.0	$	219.3	$	30.8	$	—		$	250.1

MIS And MA Revenue By Line Of Business

	Three Months Ended March 31,
	2012			2011
MIS:
Corporate finance (CFG)	$	200.5		$	181.8
Structured finance (SFG)		94.3			89.4
Financial institutions (FIG)		78.8			76.9
Public, project and infrastructure finance (PPIF)		79.1			64.5
Total external revenue		452.7			412.6
Intersegment royalty		17.1			16.0
Total		469.8			428.6
MA:
Research, data and analytics (RD&A)		119.5			109.6
Enterprise risk solutions (ERS)		48.1			43.2
Professional services		26.5			11.7
Total external revenue		194.1			164.5
Intersegment revenue		3.0			2.6
Total		197.1			167.1
Eliminations		(20.1	)		(18.6	)
Total MCO	$	646.8		$	577.1

Consolidated Revenue Information By Geographic Area

	Three Months Ended March 31,
	2012		2011
United States	$	344.0	$	301.4
International:
EMEA		195.4		183.3
Other		107.4		92.4
Total International		302.8		275.7
Total	$	646.8	$	577.1

Total Assets By Segment

	March 31, 2012								December 31, 2011
	MIS		MA		Corporate Assets (a)		Consolidated		MIS		MA		Corporate Assets (a)		Consolidated
Total Assets	$	878.3		1,318.1		798.0	$	2,994.4	$	725.9		1,289.7		860.5	$	2,876.1

(a) Represents common assets that are shared between each segment or utilized by the corporate entity. Such assets primarily include cash and cash equivalents, short-term investments, unallocated property and equipment and deferred taxes.