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Income taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
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Income Tax Disclosure |  |  |  |  |  |  |
Beginning Balance | $ 1.5 | $ 1.5 | $ 1.5 | $ 2.5 | $ 2.5 | $ 2.5 | $ 2.5
Ending Balance | $ 1.5 | $ 1.5 | $ 1.5 | $ 1.5 | $ 2.5 | $ 2.5 | $ 2.5

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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