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Other Current Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Other Current Assets [Abstract]    
Value added tax receivables $ 345.9 $ 319.4
Other tax receivables 180.4 124.9
Prepaid expenses 159.1 106.4
Other 317.5 248.5
Other current assets $ 1,002.9 $ 799.2