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Selected Financial Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 498.0 $ 437.6 $ 1,427.7 $ 1,269.0
Operating Income (Loss) 126.6 95.8 343.2 211.3
U.S. Information Services        
Segment Reporting Information [Line Items]        
Operating Income (Loss) 82.4 63.9 238.4 135.5
International        
Segment Reporting Information [Line Items]        
Operating Income (Loss) 19.9 14.4 41.5 27.5
Consumer Interactive        
Segment Reporting Information [Line Items]        
Operating Income (Loss) 46.5 41.0 144.2 125.1
Corporate Segment [Member]        
Segment Reporting Information [Line Items]        
Operating Income (Loss) (22.3) (23.5) (80.9) (76.8)
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Revenue (16.0) (15.4) (47.4) (45.7)
Operating Income (Loss) 0.0 0.0 0.0 0.0
Intersegment Eliminations [Member] | U.S. Information Services        
Segment Reporting Information [Line Items]        
Revenue (14.6) (14.3) (43.8) (42.7)
Operating Income (Loss) (14.1) (13.9) (42.5) (41.6)
Intersegment Eliminations [Member] | International        
Segment Reporting Information [Line Items]        
Revenue (1.3) (1.1) (3.5) (3.0)
Operating Income (Loss) (1.0) (0.8) (2.6) (2.2)
Intersegment Eliminations [Member] | Consumer Interactive        
Segment Reporting Information [Line Items]        
Revenue (0.1) 0.0 (0.1) 0.0
Operating Income (Loss) 15.1 14.7 45.1 43.8
Segment Revenues Gross Intersegment [Member]        
Segment Reporting Information [Line Items]        
Revenue 513.9 453.0 1,475.1 1,314.7
Segment Revenues Gross Intersegment [Member] | U.S. Information Services        
Segment Reporting Information [Line Items]        
Revenue 312.0 273.3 892.1 777.1
Segment Revenues Gross Intersegment [Member] | International        
Segment Reporting Information [Line Items]        
Revenue 94.9 82.3 265.6 227.7
Segment Revenues Gross Intersegment [Member] | Consumer Interactive        
Segment Reporting Information [Line Items]        
Revenue $ 107.0 $ 97.4 $ 317.3 $ 310.0