The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References+ Details

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

+ References+ Details

Financial Information by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue	$ 754.2	$ 688.5	$ 640.8	$ 646.8	$ 567.1	$ 531.3	$ 605.2	$ 577.1	$ 2,730.3	$ 2,280.7	$ 2,032.0
Operating, SG&A									1,547.2	1,313.1	1,192.8
Adjusted Operating Income									1,183.1	967.6	839.2
Depreciation and amortization									93.5	79.2	66.3
Goodwill impairment charge	12.2								12.2
Restructuring											0.1
Operating income	260.2	269.7	278.5	269.0	172.1	196.1	270.1	250.1	1,077.4	888.4	772.8
MIS
Segment Reporting Information [Line Items]
Revenue									1,958.3	1,634.7	1,466.3
Operating, SG&A									967.1	833.6	783.9
Adjusted Operating Income									991.2	801.1	682.4
Depreciation and amortization									44.3	41.3	35.2
Operating income									946.9	759.8	647.2
MA
Segment Reporting Information [Line Items]
Revenue									855.3	722.4	636.3
Operating, SG&A									663.4	555.9	479.5
Adjusted Operating Income									191.9	166.5	156.8
Depreciation and amortization									49.2	37.9	31.1
Goodwill impairment charge									12.2
Restructuring											0.1
Operating income									130.5	128.6	125.6
Eliminations
Segment Reporting Information [Line Items]
Revenue									(83.3)	(76.4)	(70.6)
Operating, SG&A									$ (83.3)	$ (76.4)	$ (70.6)