Quarterly report pursuant to Section 13 or 15(d)

Purchased Intangible Assets (Detail)

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Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,029.3 $ 1,077.4
Accumulated Amortization (541.7) (527.2)
Net 487.6 550.2
Purchased Data Files [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 299.5 316.2
Accumulated Amortization (237.1) (240.5)
Net 62.4 75.7
Acquired Software and Technology [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 34.9 68.3
Accumulated Amortization (12.7) (41.1)
Net 22.2 27.2
Customer Relationships [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 519.7 518.2
Accumulated Amortization (155.6) (130.3)
Net 364.1 387.9
Proprietary Database [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 125.0 125.0
Accumulated Amortization (110.9) (95.5)
Net 14.1 29.5
Non-compete Agreements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 9.2 9.0
Accumulated Amortization (4.9) (3.1)
Net 4.3 5.9
Trade Names and Other Intangible Assets [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 41.0 40.7
Accumulated Amortization (20.5) (16.7)
Net $ 20.5 $ 24.0