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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accounts receivable and other assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable and other assets:    
Trade receivables $ 6.9 $ 3.6
Prepaid expenses 25.2 21.3
VAT receivable 69.6 48.4
Deposits 10.5 8.5
Other 18.0 19.6
Total accounts receivable and other assets $ 130.2 $ 101.4