CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,940.8	$ 1,919.5
Short-term investments	164.8	186.8
Accounts receivable, net of allowances of $30.0 in 2012 and $28.0 in 2011	712.2	694.2
Deferred tax assets, net	46.9	53.9
Other current assets	197.2	114.4
Total current assets	3,061.9	2,968.8
Property and equipment, net of accumulated depreciation of $286.6 in 2012 and $258.2 in 2011	303.5	278.7
Goodwill	1,000.3	665.2
Intangible assets, net	349.8	221.6
Deferred tax assets, net	136.0	148.7
Other assets	142.2	112.1
Total assets	4,993.7	4,395.1
Current liabilities:
Accounts payable and accrued liabilities	420.2	538.9
Deferred revenue	613.2	598.4
Total current liabilities	1,041.7	1,141.3
Deferred tax liabilities, net	8.3	4.0
Non-current portion of deferred revenue	123.2	109.2
Long-term debt	2,536.5	2,101.8
Deferred tax liabilities, net	114.8	59.1
Unrecognized tax benefits	211.6	195.6
Other liabilities	348.0	360.2
Total liabilities	4,375.8	3,967.2
Contingencies (Note 14)
Redeemable noncontrolling interest	137.6	80.0
Shareholders' equity(deficit):
Preferred stock, par value $.01 per share; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Capital surplus	402.3	405.8
Retained earnings	5,936.2	5,302.1
Treasury stock, at cost; 120,619,040 and 120,462,232 shares of common stock at June 30, 2012 and December 31, 2011, respectively	5,957.6	5,319.7
Accumulated other comprehensive loss	(133.6)	(54.6)
Total Moody's shareholders' equity (deficit)	250.7	337.0
Noncontrolling interests	229.6	10.9
Total shareholders' equity (deficit)	480.3	347.9
Total liabilities, redeemable noncontrolling interest and shareholders' equity (deficit)	4,993.7	4,395.1
Nonvoting Common Stock [Member]
Shareholders' equity(deficit):
Common stock
Common Stock [Member]
Shareholders' equity(deficit):
Common stock	$ 3.4	$ 3.4