Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Current Assets and Other Current Liabilities [Abstract]
Value-added tax receivables	$ 407.4	$ 395.2
Sundry receivables	162.7	69.6
Prepaid expenses	127.0	66.8
Other taxes receivable	79.0	100.7
Held-to-maturity Investments	49.7	49.7
Current financial assets at amortized cost	39.0	42.0
Assets held-for-sale	1.9	25.8
Other	71.3	113.9
Total other current assets	$ 938.0	$ 863.7