Commitments and Contingencies (Details Textual)	0 Months Ended	12 Months Ended				0 Months Ended		1 Months Ended	12 Months Ended		0 Months Ended
	Jun. 29, 2012	Dec. 31, 2012 USD ($)	Dec. 31, 2011	Dec. 31, 2003 USD ($)	Dec. 31, 2012 S&P/DJ Indices [Member] USD ($)	Jun. 29, 2012 Parmalat [Member] USD ($)	Jun. 29, 2012 Parmalat [Member] EUR (€)	Jun. 30, 2006 Parmalat [Member] analysts	Dec. 31, 2012 Parmalat [Member]	Dec. 31, 2003 Parmalat [Member] EUR (€)	Sep. 14, 2010 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims	Jan. 22, 2012 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims	Oct. 08, 2009 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims
Loss Contingencies [Line Items]
Sale of equity investment in Rock-McGraw, Inc., percentage				45.00%
Percentage of leased building space, company		17.00%
Proceeds from the disposition of equity investment in Rock-McGraw				$ 382,000,000
Pre-tax gain from Sale of equity investment in Rock-McGraw				131,000,000
After-tax gain from Sale of equity investment in Rock-McGraw				58,000,000
Pre-tax gain pursuant to sale-leaseback accounting rules				212,000,000
After-tax gain pursuant to sale-leaseback accounting rules				126,000,000
Deferred gain		123,000,000
Sale Leaseback Transaction, Deferred Gain, Amortized During Period		13,000,000
Sale Leaseback Transaction, Interest Expense		6,000,000
Revenue from Related Parties					21,000,000
Percentage Of Interest In Joint Venture	73.00%	27.00%
Damages claimed										4,073,984,120
Rating fees paid						1,100,000	784,000
Reimbursement of trial costs							47,390
Fees paid to Court appointed experts to be reimbursed						$ 100,000	€ 67,797
Deadline to file an appeal			The deadline for any party to file an appeal is the earlier of one year and 45 daysfrom the date the judgment was issued or 30 days after any party serves a copy of the judgment on another party.
Number of days before date of hearing to file appeal									20 days
Number of analysts served notice of completion								8
Number of claims motioned to be dismissed											5	5	5
Number of claims filed												11	11
Number of claims dismissed											3