Segment Information (Tables)

9 Months Ended

Sep. 30, 2011

Segment Information [Abstract]

Financial Information By Segment

	Three Months Ended September 30,
	2011									2010
	MIS		MA		Eliminations			Consolidated		MIS		MA		Eliminations			Consolidated
Revenue	$	368.2	$	182.5	$	(19.4	)	$	531.3	$	373.7	$	157.4	$	(17.8	)	$	513.3
Expenses:
Operating, SG&A		200.0		135.4		(19.4	)		316.0		204.3		119.4		(17.8	)		305.9
Restructuring		0.1		0.1		—			0.2		0.3		0.1		—			0.4
Depreciation and amortization		9.8		9.2		—			19.0		10.3		7.8		—			18.1
Total		209.9		144.7		(19.4	)		335.2		214.9		127.3		(17.8	)		324.4
Operating income	$	158.3	$	37.8	$	—		$	196.1	$	158.8	$	30.1	$	—		$	188.9

		Nine Months Ended September 30,
		2011									2010
		MIS		MA		Eliminations			Consolidated		MIS		MA		Eliminations			Consolidated
Revenue	$	1,251.0	$	519.4	$	(56.8	)	$	1,713.6	$	1,068.6	$	452.4	$	(53.3	)	$	1,467.7
Expenses:
Operating, SG&A		604.2		391.3		(56.8	)		938.7		562.0		333.7		(53.3	)		842.4
Restructuring		—		0.1		—			0.1		—		—		—			—
Depreciation and amortization		30.8		27.7		—			58.5		26.3		22.8		—			49.1
Total		635.0		419.1		(56.8	)		997.3		588.3		356.5		(53.3	)		891.5
Operating income	$	616.0	$	100.3	$	—		$	716.3	$	480.3	$	95.9	$	—		$	576.2

MIS And MA Revenue By Line Of Business

	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
MIS:
Corporate finance (CFG)	$	129.0		$	144.9		$	510.9		$	399.2
Structured finance (SFG)		82.0			70.1			257.7			214.7
Financial institutions (FIG)		72.1			73.6			228.1			213.0
Public, project and infrastructure finance (PPIF)		68.3			69.6			205.3			195.4
Total external revenue		351.4			358.2			1,202.0			1,022.3
Intersegment royalty		16.8			15.5			49.0			46.3
Total		368.2			373.7			1,251.0			1,068.6
MA:
Research, data and analytics (RD&A)		115.3			106.0			335.9			315.8
Risk management software (RMS)		47.9			42.8			127.5			115.3
Professional services		16.7			6.3			48.2			14.3
Total external revenue		179.9			155.1			511.6			445.4
Intersegment license fee		2.6			2.3			7.8			7.0
Total		182.5			157.4			519.4			452.4
Eliminations		(19.4	)		(17.8	)		(56.8	)		(53.3	)
Total MCO	$	531.3		$	513.3		$	1,713.6		$	1,467.7

Total Assets By Segment

	September 30, 2011								December 31, 2010
	MIS		MA		Corporate Assets (a)		Consolidated		MIS		MA		Corporate Assets (a)		Consolidated
Total Assets	$	591.3		821.2		1,108.8	$	2,521.3	$	639.0		910.0		991.3	$	2,540.3

(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.