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Identifiable Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2012
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets $ 1,986.4
Database and credit files
 
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets 765.0
Estimated useful life 15 years
Technology and software
 
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets 364.6
Estimated useful life 7 years
Trade names and trademarks
 
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets 546.1
Estimated useful life 40 years
Customer relationships
 
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets 308.0
Estimated useful life 20 years
Other
 
Identifiable Intangibles [Line Items]  
Total identifiable intangible assets $ 2.7
Estimated useful life 5 years