Asset retirement obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

A reconciliation of the Company’s asset retirement obligations for the years ended December 31, 2023, for the 2 months ended December 31, 2022, for the year ended October 31, 2022 and 2021 on a discounted basis are as follows:

	For the year ended December 31, 2023		For the 2 months ended December 31, 2022		For the year ended October 31, 2022		For the year ended October 31, 2021
Balance, beginning of the year	$	0.4	$	0.4	$	0.4	$	—
Non-cash additions	0.5		—		—		0.4
Accretion of liability and foreign exchange	0.1		—		—		—
Balance, end of year	$	1.0	$	0.4	$	0.4	$	0.4