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Marketable securities - Schedule of Marketable Securities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024
Marketable securities [Line Items] |  |
Market value, current | $ 56.1 | $ 1.9
Market value, noncurrent | 4.8 | 5.7
Unrealized loss, net | (0.2) |
Current assets |  |
Marketable securities [Line Items] |  |
Market value, current | 56.1 | 1.9
Cost or amortized cost | 56.1 | 1.9
Noncurrent assets |  |
Marketable securities [Line Items] |  |
Market value, noncurrent | 4.8 | 5.7
Cost or amortized cost | $ 5.0 | $ 5.7

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