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Reportable Segments (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash paid for capital expenditures, by segment      
Payments to acquire property, plant, and equipment $ 135.3 $ 124.0 $ 132.2
U.S. Information Services [Member]      
Cash paid for capital expenditures, by segment      
Payments to acquire property, plant, and equipment 88.8 82.5 86.5
International [Member]      
Cash paid for capital expenditures, by segment      
Payments to acquire property, plant, and equipment 34.3 30.2 29.8
Interactive [Member]      
Cash paid for capital expenditures, by segment      
Payments to acquire property, plant, and equipment 9.6 9.1 7.9
Corporate [Member]      
Cash paid for capital expenditures, by segment      
Payments to acquire property, plant, and equipment $ 2.6 $ 2.2 $ 8.0