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Other Current Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other Current Assets [Abstract]    
Value added tax receivables $ 484.3 $ 319.4
Other tax receivables 183.6 124.9
Prepaid expenses 132.1 106.4
Other 329.6 248.5
Other current assets $ 1,129.6 $ 799.2