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Income taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
(Benefit) provision for income taxes 237.60% 66.00%
Deferred tax asset valuation allowance, increase (decrease) $ (6.6)  
Operating loss carryforwards 409.8  
Disallowed business interest expense carryforwards 518.0  
State net operating loss carryforwards 1,100.0  
Foreign net operating loss carryforwards 170.0  
General business tax credit 13.7  
Foreign tax credits 0.2  
State credits 4.7  
Uncertain tax positions 46.0  
Unrecognized tax benefits, accrued interest and penalties 0.0 $ 0.0
Foreign Tax Jurisdiction    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Foreign capital loss carryforwards 46.8  
Foreign Valuation Allowances    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Deferred tax asset valuation allowance, increase (decrease) (3.6)  
Capital Loss Carryforward    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Deferred tax asset valuation allowance, increase (decrease) (11.6)  
U.S Disallowed Interest Expense Carryforward    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Deferred tax asset valuation allowance, increase (decrease) 3.7  
Currency Translation Adjustment    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Deferred tax asset valuation allowance, increase (decrease) 3.9  
Other    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Deferred tax asset valuation allowance, increase (decrease) $ 1.0