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Marketable Investments - Held-to-Maturity and Other (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Marketable investments classified as held-to-maturity:    
Marketable Investments classified as held-to-maturity $ 9.3 $ 30.1
Time deposits    
Other investments    
Other investments $ 25.1