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Reportable Segments (Details 1) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenue                 $ 1,933.8 $ 1,704.9 $ 1,506.8
Operating income (loss) $ 121.5 $ 126.6 $ 115.5 $ 101.1 $ 89.3 $ 95.8 $ 63.5 $ 51.9 464.7 300.5 197.1
Non-operating income and expense                 (92.2) (95.1) (170.5)
Income before income taxes                 372.5 205.4 26.6
U.S. Information Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 313.0 203.5 130.5
International [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 58.2 49.8 21.2
Interactive [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 198.4 168.9 137.2
Corporate Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (104.9) (121.6) (91.8)
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (64.2) (61.1) (57.1)
Operating income (loss)                 0.0 0.0 0.0
Intersegment Eliminations [Member] | U.S. Information Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (59.3) (57.0) (53.9)
Operating income (loss)                 (57.6) (55.5) (52.4)
Intersegment Eliminations [Member] | International [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (4.8) (4.0) (3.2)
Operating income (loss)                 (3.5) (3.0) (1.9)
Intersegment Eliminations [Member] | Interactive [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (0.2) 0.0 0.0
Operating income (loss)                 61.1 58.5 54.4
Intersegment Eliminations [Member] | Corporate Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 0.0 0.0 0.0
Segment Revenues Gross Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,998.1 1,766.0 1,563.9
Segment Revenues Gross Intersegment [Member] | U.S. Information Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,204.1 1,045.1 924.5
Segment Revenues Gross Intersegment [Member] | International [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 361.9 313.9 269.6
Segment Revenues Gross Intersegment [Member] | Interactive [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 $ 432.1 $ 407.1 $ 369.8