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Income taxes - Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, at beginning of year | $ (1,150.1) | $ (1,110.5) | $ (1,226.2)
Increase (decrease) in valuation allowance | (7.9) |  |
Valuation allowance, at end of year | (1,168.6) | (1,150.1) | (1,110.5)
Change in valuation allowances | 7.9 | 2.1 | (9.8)
Actuarial pension adjustments |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | 24.8 | 84.5 | 70.7
Expired net operating losses/tax credits |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | 35.2 | 42.9 | 52.3
Foreign exchange |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | 15.5 | (6.8) | 14.8
Recognition of income tax benefit (expense) |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | (56.0) | (125.9) | (43.9)
Other |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | (38.0) | (34.3) | 21.8
US Pension Activity |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Change in valuation allowances | $ (44.8) | $ (95.9) | $ (11.3)

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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