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Earning from Equity Method Investments Included in Other Income and Expense Net (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Other income and expense, net from equity method investments $ 2.3 $ 2.0 $ 6.2 $ 6.5
U.S. Information Services        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Other income and expense, net from equity method investments 0.5 0.5 1.5 1.4
International        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Other income and expense, net from equity method investments $ 1.8 $ 1.5 $ 4.7 $ 5.1