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Other Current Assets & Other Current Liabilities - Other Current Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Other Current Assets and Other Current Liabilities [Abstract]    
Value-added tax receivables $ 552.0 $ 532.5
Prepaid expenses 140.7 136.2
Other taxes receivables 129.2 155.8
Held-to-maturity investments (short - term) 60.0 60.0
Asset held for sale 25.0 50.2
Available-for-sale securities (short - term) 0.0 9.9
Other 246.8 261.6
Total other current assets $ 1,153.7 $ 1,206.2