Other current assets
| December 31, | ||||||||||||
| 2017 | 2016 | 2015 | ||||||||||
| (In millions of US$) | ||||||||||||
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Personnel and other tax assets |
46.5 | 31.8 | 40.8 | |||||||||
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Fair value of financial instruments |
— | — | 0.3 | |||||||||
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Restricted cash |
12.1 | 4.0 | 0.7 | |||||||||
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Other miscellaneous receivables |
22.7 | 42.7 | 42.6 | |||||||||
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Supplier prepayments |
19.6 | 12.0 | 20.9 | |||||||||
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Prepaid expenses |
16.1 | 15.3 | 13.9 | |||||||||
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Other current assets |
117.0 | 105.8 | 119.2 | |||||||||
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