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Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Apr. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2010
Dec. 31, 2011
Legacy Tax Matters 1989-1990 And 1993-1996 [Member]
May 31, 2010
Total Benefit For Expiration Of Statute Of Limitations For 1997 To 2002 [Member]
Dec. 31, 2006
Total Benefit For Expiration Of Statute Of Limitations For 1997 To 2002 [Member]
Dec. 31, 2011
Legacy Tax Matters [Member]
Dec. 31, 2009
Legacy Tax Matters IMS Health And NMR 1989 - 1990 [Member]
Dec. 31, 2009
Legacy Tax Matters IMS Health And NMR 1993 - 1996 [Member]
Dec. 31, 2011
Legacy Tax Matters Amortization Expense Deductions 2000 Distribution Agreement [Member]
May 31, 2010
Settlement Of Tax 1997 - 2002 [Member]
Loss Contingencies [Line Items]                            
Anticipated future tax benefits       50.00%                    
Liabilities for 2000 Distribution Agreement and Liabilities for Legacy Tax Matters, Liability for the remaining potential exposure       $ 52.6   $ 57.3 $ 54.6           $ 52.6  
Proceeds from IMS Health, NMR arbitration settlements and New D&B for 50% of the anticipated future tax benefits through 2012                   55.0 10.8      
Deposit with IRS to stop the accrual of statutory interest on potential tax deficiencies with respect to the 1997 through 2002 tax years, New D&B and Moody's commenced procedures to recover approximately       12.2   11.4     39.8          
Benefit to net income related to the resolution of Legacy Tax Matters   7.0 4.6                 8.2    
Reduction of interest expense   2.8     6.5                  
Reduction in interest expense, net of tax   1.7                        
Reduction of tax expense         4.3                  
Increase in other non-operating income   6.4                        
Refund from IRS for the 1997 tax year                           5.2
Refund from IRS for the 1997 tax year, interest                           2.5
Liability for legacy tax matters             2              
After-tax benefit from tax settlement               4.6            
Legacy Refund, net 0.6                          
Legacy Refund 0.9                          
Total legacy tax impact unusual in nature       7.0                    
Total legacy tax impact       $ 8.7