Consolidated Balance Sheets (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 854.2	$ 659.6
Short-term investments	13.3	12.7
Accounts receivable, net of allowances of $29.7 in 2011 and $33.0 in 2010	400.5	497.5
Deferred tax assets, net	42.2	45.3
Other current assets	49.8	127.9
Total current assets	1,360.0	1,343.0
Property and equipment, net of accumulated depreciation of $244.4 in 2011 and $200.8 in 2010	323.7	319.3
Goodwill	451.1	465.5
Intangible assets, net	153.0	168.8
Deferred tax assets, net	172.1	187.9
Other assets	61.4	55.8
Total assets	2,521.3	2,540.3
Current liabilities:
Accounts payable and accrued liabilities	311.2	414.4
Current portion of long-term debt	43.1	11.3
Deferred revenue	480.6	508.1
Total current liabilities	834.9	933.8
Non-current portion of deferred revenue	96.4	96.6
Long-term debt	1,200.9	1,228.3
Deferred tax liabilities, net	31.1	36.9
Unrecognized tax benefits	174.6	180.8
Other liabilities	357.6	362.3
Total liabilities	2,695.5	2,838.7
Contingencies (Note 12)
Shareholders' deficit:
Preferred stock, par value $.01 per share; 10,000,000 shares authorized; no shares issued and outstanding
Capital surplus	386.7	391.5
Retained earnings	4,147.4	3,736.2
Treasury stock, at cost; 120,863,505 and 112,116,581 shares of common stock at September 30, 2011 and December 31, 2010, respectively	(4,651.0)	(4,407.3)
Accumulated other comprehensive loss	(70.5)	(33.4)
Total Moody's shareholders' deficit	(184.0)	(309.6)
Noncontrolling interests	9.8	11.2
Total shareholders' deficit	(174.2)	(298.4)
Total liabilities and shareholders' deficit	2,521.3	2,540.3
Series Common Stock [Member]
Shareholders' deficit:
Common stock
Common Stock [Member]
Shareholders' deficit:
Common stock	$ 3.4	$ 3.4