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Earning from Equity Method Investments Included in Other Income and Expense Net (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Other income and (expense), net from equity method investments $ 2.0 $ 2.0 $ 3.7 $ 3.9
U.S. Information Services        
Segment Reporting Information [Line Items]        
Other income and (expense), net from equity method investments 0.5 0.6 0.8 1.0
International        
Segment Reporting Information [Line Items]        
Other income and (expense), net from equity method investments $ 1.5 $ 1.4 $ 2.9 $ 2.9