CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue	$ 2,730.3	$ 2,280.7	$ 2,032.0
Expenses
Operating	795.0	683.5	604.8
Selling, general and administrative	752.2	629.6	588.0
Goodwill impairment charge	12.2
Restructuring			0.1
Depreciation and amortization	93.5	79.2	66.3
Total expenses	1,652.9	1,392.3	1,259.2
Operating income	1,077.4	888.4	772.8
Interest income (expense), net	(63.8)	(62.1)	(52.5)
Other non-operating income (expense), net	10.4	13.5	(5.9)
Non-operating income (expense), net	(53.4)	(48.6)	(58.4)
Income before provision for income taxes	1,024.0	839.8	714.4
Provision for income taxes	324.3	261.8	201.0
Net income	699.7	578.0	513.4
Less: Net income attributable to noncontrolling interests	9.7	6.6	5.6
Net income attributable to Moody's	$ 690.0	$ 571.4	$ 507.8
Earnings per share
Basic	$ 3.09	$ 2.52	$ 2.16
Diluted	$ 3.05	$ 2.49	$ 2.15
Weighted average shares outstanding
Basic	223.2	226.3	235.0
Diluted	226.6	229.4	236.6