Prepayments, deposits and other current assets - Schedule of Prepaids (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid equipment deposits	$ 39.6	$ 40.1
Prepaid transaction costs	7.7	7.8
Prepaid lease deposits	5.3	5.6
Prepaid insurance	3.5	4.6
Prepaid construction charges	0.9	2.6
Other prepaids	4.2	3.3
Total prepayments, deposits and other current assets	61.2	64.0
Non-current security deposits	(5.3)	(5.0)
Non-current insurance	(0.6)	(2.8)
Prepayments, deposits and other current assets	$ 55.3	$ 56.2