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Other Current Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Other Current Assets [Abstract]    
Value added tax receivables $ 432.3 $ 319.4
Other tax receivables 183.8 124.9
Prepaid expenses 161.3 106.4
Other 313.0 248.5
Other current assets $ 1,090.4 $ 799.2