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Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Current Assets [Abstract]    
Value-added tax receivables $ 532.5 $ 319.4
Other tax receivables 155.8 124.9
Prepaid expenses 136.2 106.4
Held-to-maturity investments (short-term) 60.0 0.0
Assets held for sale 50.2 2.2
Available-for-sale securities (short-term) 9.9 0.0
Other 261.6 246.3
Other current assets $ 1,206.2 $ 799.2