Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Disaggregation of Revenue (Details)

v3.10.0.1
REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Operating revenue $ 834.2 $ 834.8 $ 2,576.8 $ 2,523.8
Change in revenue $ (0.6)   $ 53.0  
Operating revenue 0.00%   2.00%  
Operating Segments | U.S. Information Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 308.3 307.7 $ 939.8 949.7
Change in revenue $ 0.6   $ (9.9)  
Operating revenue 0.00%   (1.00%)  
Operating Segments | U.S. Information Solutions | Online Information Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 222.4 221.0 $ 666.2 678.7
Change in revenue $ 1.4   $ (12.5)  
Operating revenue 1.00%   (2.00%)  
Operating Segments | U.S. Information Solutions | Mortgage Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 39.0 38.8 $ 126.2 116.1
Change in revenue $ 0.2   $ 10.1  
Operating revenue 1.00%   9.00%  
Operating Segments | U.S. Information Solutions | Financial Marketing Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 46.9 47.9 $ 147.4 154.9
Change in revenue $ (1.0)   $ (7.5)  
Operating revenue (2.00%)   (5.00%)  
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 235.0 239.8 $ 729.8 687.5
Change in revenue $ (4.8)   $ 42.3  
Operating revenue (2.00%)   6.00%  
Operating Segments | International | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 80.5 81.2 $ 249.0 229.7
Change in revenue $ (0.7)   $ 19.3  
Operating revenue (1.00%)   8.00%  
Operating Segments | International | Europe        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 68.5 69.0 $ 211.4 199.2
Change in revenue $ (0.5)   $ 12.2  
Operating revenue (1.00%)   6.00%  
Operating Segments | International | Latin America        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 48.7 54.5 $ 158.9 158.5
Change in revenue $ (5.8)   $ 0.4  
Operating revenue (11.00%)   0.00%  
Operating Segments | International | Canada        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 37.3 35.1 $ 110.5 100.1
Change in revenue $ 2.2   $ 10.4  
Operating revenue 6.00%   10.00%  
Operating Segments | Workforce Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 202.2 186.4 $ 620.9 580.9
Change in revenue $ 15.8   $ 40.0  
Operating revenue 9.00%   7.00%  
Operating Segments | Workforce Solutions | Verification Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 143.9 129.9 $ 421.6 375.3
Change in revenue $ 14.0   $ 46.3  
Operating revenue 11.00%   12.00%  
Operating Segments | Workforce Solutions | Employer Services        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 58.3 56.5 $ 199.3 205.6
Change in revenue $ 1.8   $ (6.3)  
Operating revenue 3.00%   (3.00%)  
Operating Segments | Global Consumer Solutions        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 88.7 $ 100.9 $ 286.3 $ 305.7
Change in revenue $ (12.2)   $ (19.4)  
Operating revenue (12.00%)   (6.00%)