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Prepayments, deposits and other current assets
 6 Months Ended
Jun. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepayments, deposits and other current assets Prepayments, deposits and other current assets
As atJune 30, 2024December 31, 2023
Prepaid equipment deposits$0.9$40.1
Prepaid transaction costs10.07.8
Prepaid lease deposits6.15.6
Prepaid insurance5.64.6
Prepaid construction charges0.92.6
Other prepaids4.23.3
Total prepayments, deposits and other current assets$27.7$64.0
Non-current security deposits(6.1)(5.0)
Non-current insurance(0.2)(2.8)
Current prepayments and deposits$21.4$56.2
Other prepaids consist principally of other deposits, prepaid subscriptions and environmental deposits. Non-current security deposits and non-current insurance are recorded in other assets on the condensed consolidated interim statements of financial
position. Prepaid transaction costs primarily consist of prepayments made in connection with the conditional commitment with the U.S. Department of Energy Loan Programs Office for a loan