Quarterly report pursuant to Section 13 or 15(d)

Purchased Intangible Assets (Detail)

v2.4.0.6
Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,020.8 $ 1,077.4
Accumulated Amortization (514.9) (527.2)
Net 505.9 550.2
Purchased data files
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 294.2 316.2
Accumulated Amortization (228.1) (240.5)
Net 66.1 75.7
Acquired software and technology
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 34.7 68.3
Accumulated Amortization (10.9) (41.1)
Net 23.8 27.2
Customer relationships
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 517.2 518.2
Accumulated Amortization (146.7) (130.3)
Net 370.5 387.9
Proprietary database
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 125.0 125.0
Accumulated Amortization (105.7) (95.5)
Net 19.3 29.5
Non-compete agreements
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 9.0 9.0
Accumulated Amortization (4.3) (3.1)
Net 4.7 5.9
Trade names and other intangible assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 40.7 40.7
Accumulated Amortization (19.2) (16.7)
Net $ 21.5 $ 24.0