Current report filing

Purchased Intangible Assets (Detail)

v2.4.0.8
Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,538.0 $ 1,077.4
Accumulated Amortization (550.3) (527.2)
Net 987.7 550.2
Purchased data files
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 795.6 316.2
Accumulated Amortization (229.2) (240.5)
Net 566.4 75.7
Acquired software and technology
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 34.4 68.3
Accumulated Amortization (13.5) (41.1)
Net 20.9 27.2
Customer relationships
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 522.1 518.2
Accumulated Amortization (164.5) (130.3)
Net 357.6 387.9
Proprietary database
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 125.0 125.0
Accumulated Amortization (115.9) (95.5)
Net 9.1 29.5
Non-compete agreements
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 19.4 9.0
Accumulated Amortization (5.5) (3.1)
Net 13.9 5.9
Trade names and other intangible assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 41.5 40.7
Accumulated Amortization (21.7) (16.7)
Net $ 19.8 $ 24.0