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Reportable Segments (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other income and expense, net, included earnings (losses) from equity method investments      
Other income and expense, net from equity method investments $ 9.1 $ 8.6 $ 8.8
U.S. Information Services [Member]      
Other income and expense, net, included earnings (losses) from equity method investments      
Other income and expense, net from equity method investments 2.0 1.9 1.8
International [Member]      
Other income and expense, net, included earnings (losses) from equity method investments      
Other income and expense, net from equity method investments $ 7.1 $ 6.7 $ 7.0