Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Disaggregation of Revenue (Details)

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REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Operating revenue $ 876.9 $ 856.7 $ 1,742.6 $ 1,689.0
Change in revenue $ 20.2   $ 53.6  
Operating revenue 2.00%   3.00%  
Operating Segments | U.S. Information Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 324.6 331.9 $ 631.5 642.0
Change in revenue $ (7.3)   $ (10.5)  
Operating revenue (2.00%)   (2.00%)  
Operating Segments | U.S. Information Solutions | Online Information Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 224.1 232.6 $ 443.8 457.7
Change in revenue $ (8.5)   $ (13.9)  
Operating revenue (4.00%)   (3.00%)  
Operating Segments | U.S. Information Solutions | Mortgage Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 45.5 38.6 $ 87.2 77.3
Change in revenue $ 6.9   $ 9.9  
Operating revenue 18.00%   13.00%  
Operating Segments | U.S. Information Solutions | Financial Marketing Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 55.0 60.7 $ 100.5 107.0
Change in revenue $ (5.7)   $ (6.5)  
Operating revenue (9.00%)   (6.00%)  
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 250.3 231.4 $ 494.8 447.7
Change in revenue $ 18.9   $ 47.1  
Operating revenue 8.00%   11.00%  
Operating Segments | International | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 86.1 76.5 $ 168.5 148.5
Change in revenue $ 9.6   $ 20.0  
Operating revenue 12.00%   13.00%  
Operating Segments | International | Europe        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 72.3 68.5 $ 143.0 130.2
Change in revenue $ 3.8   $ 12.8  
Operating revenue 6.00%   10.00%  
Operating Segments | International | Latin America        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 54.2 52.9 $ 110.1 104.0
Change in revenue $ 1.3   $ 6.1  
Operating revenue 2.00%   6.00%  
Operating Segments | International | Canada        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 37.7 33.5 $ 73.2 65.0
Change in revenue $ 4.2   $ 8.2  
Operating revenue 13.00%   13.00%  
Operating Segments | Workforce Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 207.6 194.5 $ 418.7 394.5
Change in revenue $ 13.1   $ 24.2  
Operating revenue 7.00%   6.00%  
Operating Segments | Workforce Solutions | Verification Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 149.3 130.3 $ 277.7 245.4
Change in revenue $ 19.0   $ 32.3  
Operating revenue 15.00%   13.00%  
Operating Segments | Workforce Solutions | Employer Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 58.3 64.2 $ 141.0 149.1
Change in revenue $ (5.9)   $ (8.1)  
Operating revenue (9.00%)   (5.00%)  
Operating Segments | Global Consumer Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 94.4 $ 98.9 $ 197.6 $ 204.8
Change in revenue $ (4.5)   $ (7.2)  
Operating revenue (5.00%)   (4.00%)