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Income taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Effective tax rate (as a percent) 66.00% 0.00% (1.80%)
Deferred tax asset valuation allowance, increase (decrease) $ (7.4) $ 12.0  
Operating loss carryforwards 396.2    
Disallowed business interest expense carryforwards 500.9    
State net operating loss carryforwards 1,058.0    
Foreign net operating loss carryforwards 184.7    
General business tax credit 6.2    
Foreign tax credits 0.2    
State credits 4.7    
Uncertain tax positions 41.7    
Release of uncertain tax position reserves (11.3)    
Interest and penalties related to an IRS audit 4.8    
Unrecognized tax benefits, accrued interest and penalties 0.1 $ 4.6  
U.S Disallowed Interest Expense Carryforward      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred tax asset valuation allowance, increase (decrease) 6.1    
Foreign Valuation Allowances      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred tax asset valuation allowance, increase (decrease) (10.9)    
Currency Translation Adjustment      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred tax asset valuation allowance, increase (decrease) 0.6    
Other      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred tax asset valuation allowance, increase (decrease) (3.2)    
Foreign Tax Jurisdiction      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Foreign capital loss carry forwards $ 43.2