Quarterly report pursuant to Section 13 or 15(d)

DiscontinuedOperations - Additional Information (Detail)

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DiscontinuedOperations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash received from divestitures $ 43.7 $ 0
Revenue from discontinued operations 9.3 16.7
Pretax income from discontinued operations 1.5 0.8
Gain on divestitures 18.4  
Income tax benefit from disposals 18.1  
Discontinued Operation Income Loss From Discontinued Operation Income Tax Benefit Current 14.3  
Us Consumer Information Solutions [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash received from divestitures 47.5  
Talent Management Services [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Escrow Receivable From Sale Of Business $ 3.5