Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations - Additional Information (Detail)

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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash received from divestitures     $ 47.5 $ 2.5
Revenue from discontinued operations 0 22.6 9.3 39.4
Pretax income from discontinued operations 0 3.7 1.5 4.5
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