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Selected Financial Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 389.1 $ 338.2 $ 1,120.7 $ 969.1
Operating income (loss) 60.3 40.8 148.2 107.9
Corporate        
Segment Reporting Information [Line Items]        
Operating income (loss) (26.9) (21.6) (69.7) (58.6)
Segment Revenues Gross Intersegment [Member]        
Segment Reporting Information [Line Items]        
Revenue 392.5 341.1 1,130.4 977.6
Segment Revenues Gross Intersegment [Member] | U.S. Information Services        
Segment Reporting Information [Line Items]        
Revenue 243.8 214.0 707.0 619.4
Segment Revenues Gross Intersegment [Member] | International        
Segment Reporting Information [Line Items]        
Revenue 68.7 68.7 199.8 187.1
Segment Revenues Gross Intersegment [Member] | Interactive [Member]        
Segment Reporting Information [Line Items]        
Revenue 80.0 58.4 223.6 171.1
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Revenue (3.4) (2.9) (9.7) (8.5)
Operating income (loss) 0.0 0.0 0.0 0.0
Intersegment Eliminations [Member] | U.S. Information Services        
Segment Reporting Information [Line Items]        
Revenue (2.6) (2.3) (7.4) (6.9)
Operating income (loss) (2.2) (2.0) (6.3) (5.9)
Intersegment Eliminations [Member] | International        
Segment Reporting Information [Line Items]        
Revenue (0.8) (0.6) (2.3) (1.6)
Operating income (loss) (0.5) (0.2) (1.4) (0.4)
Intersegment Eliminations [Member] | Interactive [Member]        
Segment Reporting Information [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Operating income (loss) 2.7 2.2 7.7 6.3
Segment Operating Income Gross Intersegment [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) 60.3 40.8 148.2 107.9
Segment Operating Income Gross Intersegment [Member] | U.S. Information Services        
Segment Reporting Information [Line Items]        
Operating income (loss) 47.3 34.8 124.5 96.4
Segment Operating Income Gross Intersegment [Member] | International        
Segment Reporting Information [Line Items]        
Operating income (loss) 7.9 8.5 12.5 15.6
Segment Operating Income Gross Intersegment [Member] | Interactive [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) $ 32.0 $ 19.1 $ 80.9 $ 54.5