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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accounts receivable and other assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounts receivable and other assets:    
Trade receivables $ 8.1 $ 6.9
Prepaid expenses 21.6 25.2
VAT receivable 46.6 69.6
Deposits 28.9 10.5
Unrealized fair value of derivative assets 6.5 7.2
Other 10.6 18.0
Total accounts receivable and other assets $ 122.3 $ 137.4