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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 339.6 |
State and local | 196.0 |
Foreign | 252.0 |
Total tax loss carryforwards | 787.6 | $ 813.0
Operating Loss Carryforwards [Line Items] |  |
Unlimited | 277.3 |
Total tax loss carryforwards | 787.6 | $ 813.0
2025 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 20.4 |
2026 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 15.1 |
2027 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 19.0 |
2028 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 89.9 |
2029 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 4.9 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 361.0 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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