Quarterly report pursuant to Section 13 or 15(d)

Purchased Intangible Assets (Detail)

v2.4.0.8
Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,375.6 $ 1,538.0
Accumulated Amortization (409.3) (550.3)
Net 966.3 987.7
Purchased Data Files [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 704.7 795.6
Accumulated Amortization (178.6) (229.2)
Net 526.1 566.4
Acquired Software and Technology [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 36.1 34.4
Accumulated Amortization (18.7) (13.5)
Net 17.4 20.9
Customer Relationships [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 493.5 522.1
Accumulated Amortization (165.1) (164.5)
Net 328.4 357.6
Reacquired Rights [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 73.3 0
Accumulated Amortization (9.7) 0
Net 63.6 0
Proprietary Database [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.4 125.0
Accumulated Amortization (4.9) (115.9)
Net 2.5 9.1
Non-compete Agreements [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 20.6 19.4
Accumulated Amortization (8.6) (5.5)
Net 12.0 13.9
Trade Names and Other Intangible Assets [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 40.0 41.5
Accumulated Amortization (23.7) (21.7)
Net $ 16.3 $ 19.8