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Marketable securities - Schedule of Marketable Securities (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Marketable securities [Line Items] |  |
Market value, current | $ 2.1 | $ 56.1
Market value, noncurrent | 5.3 | 4.8
Non Current Assets |  |
Marketable securities [Line Items] |  |
Unrealized loss, net | 0.2 | (0.2)
Current Assets |  |
Marketable securities [Line Items] |  |
Market value, current | 2.1 | 56.1
Cost or amortized cost | 2.1 | 56.1
Non Current Assets |  |
Marketable securities [Line Items] |  |
Market value, noncurrent | 5.3 | 4.8
Cost or amortized cost | $ 5.1 | $ 5.0

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